The HSTPROMO collaboration studies a set of related research projects with various high-resolution space telescopes (Hubble, Gaia and other future telescopes), with overlapping sets of investigators, all aimed at improving our dynamical understanding of stars, clusters, and galaxies in the nearby Universe through measurement and interpretation of their proper motions (PMs).

Individual projects are pursued by traditional teams consisting of a Principal Investigator (PI)/Lead Author and select Co-Investigators (CoIs)/Co-authors. HSTPROMO adds coherence to the overall effort, and provides a framework for sharing of techniques, expertise, models, and insights.

After nearly 20 years of work, our collaboration has had 70 Hubble Space Telescope (HST) projects awarded in highly competitive peer-review, supported by 9.8 million dollars in NASA research funding. A total of 61 Hubble-related papers and 22 Gaia-related papers have been completed, with many others in preparation. We are also leading 7 guaranteed-time JWST projects, and are starting to publish JWST-related papers. Our research results have been the topic of 18 press releases, a live-televised NASA press conference, 2 Astronomy Picture of the Day images, and 2 Gaia image of the week images. It has been discussed by Nature Magazine, Scientific American, National Geographic, CNN TV, and many other media outlets around the world.

A brief summary of the main HSTPROMO projects and results can be found in van der Marel et al. (2014), which summarizes our work on globular clusters; young star clusters; stars and stellar streams in the Milky Way halo; Local Group galaxies, including dwarf satellite galaxies, the Magellanic Clouds, and the Andromeda galaxy; and AGN Black Hole Jets. A more extensive review of Local Group proper motion dynamics is presented in van der Marel (2014). Slides from a recent talk about some of these results can be found here.

Member-only page

(The HSTPROMO logo was designed by Elena Montuschi).

• Roeland van der Marel (STScI; dynamical research applications)
• Jay Anderson (STScI; data analysis methods)

Members

• Andrea Bellini (STScI; Globular clusters, PM data analysis)
• Paul Bennet (STScI; Dwarf Galaxies)
• Gurtina Besla (U. of Arizona; Magellanic Clouds, Local Group dynamical modeling)
• Andres del Pino Molina (Centro de Estudios de Física del Cosmos de Aragon, Spain; dwarf galaxies, dynamics, stellar populations)
• Mark Fardal (Eureka; Local group theoretical dynamics, streams, N-body simulations)
• Puragra Guhathakurta (U. of California, Santa Cruz; M31, Milky Way halo, ground-based spectroscopy)
• Nitya Kallivayalil (U. of Virginia; Magellanic Clouds, PM data analysis, dynamical modeling)
• Mattia Libralato (University of Padova, Italy; Globular clusters, PM data analysis)
• Kevin McKinnon (CITA, Canada; Milky Way halo, spectroscopy, PM determination)
• Eileen Meyer (U. of Maryland, Baltimore County; AGN jets, PM data analysis)
• Ekta Patel (U. of Utah; Local Group and Cosmological dynamical modeling)
• Marcel Pawlowski (Leibniz-Institut for Astrophysics, Potsdam, Germany; satellite galaxy planes, dwarf galaxies, near-field cosmology)
• Elena Sabbi (Gemini Obvservatory; Magellanic Clouds, Tarantula Nebula, stellar populations)
• Sangmo Tony Sohn (STScI; Local Group galaxies, PM data analysis using background galaxies)
• Eduardo Vitral (STScI; Globular clusters, dynamical modeling)
• Laura Watkins (STScI; Local Group, Globular clusters, dynamical modeling)

Associates/Advisors/Former Members

• Many other PIs and CoIs on individual projects, and co-authors on individual papers, as available through the links below, including:
• Mayte Alfaro Cuelo (STScI; Globular Clusters; Integral Field Spectroscopy)
• Paolo Bianchini (Observatoire Astronomique, Strasbourg, France; Globular Clusters, dynamical modeling)
• Mike Boylan-Kolchin (U. of Texas, Austin; Local Group, cosmological modeling)
• Julio Chaname (Pontificia Universidad Catolica de Chile; globular clusters, PM data analysis)
• Emily Cunningham (Flatiron Institute, New York; Milky Way halo, ground-based spectroscopy)
• Alis Deason (Durham University, United Kingdom; Milky Way halo, dynamical modeling)
• Tuan Do (UCLA; Milky Way dSphs, PM data analysis)
• Tobias Fritz (Instituto de Astrofisica de Canarias; Ground-based AO and Gaia proper motions; Milky Way dynamics)
• Danny Lennon (Instituto de Astrofisica de Canarias, Spain; Young stars and star clusters)
• Nora Lutzgendorf (ESA/STScI; globular clusters, intermediate-mass black holes, IFU spectroscopy)
• Davide Massari (U. of Groningen; Globular Clusters, PM data analysis)
• Imants Platais (Johns Hopkins U.; Open clusters, PM data analysis)
• Elena Sacchi (STScI; Star Formation Histories; Dwarf Galaxies)
• Johannes Sahlmann (STScI; exoplanets, PM data analysis, GAIA)
• Michele Trenti (U. of Melbourne; Globular clusters, N-body modeling)
• Paul Zivick (U. of Virginia; Small Magellanic Clouds, PM data analysis)

Press Releases, Images, and Media Attention

• 2024: NASAs Hubble Traces Dark Matter in Dwarf Galaxy Using Stellar Motions (Hubblesite)
• 2023: NASAs Hubble Hunts for Intermediate-Sized Black Hole Close to Home
• 2022: Chasser des trous noirs dans un cimetiere d'etoiles
• 2022: When Gaia meets Hubble: accurate proper motions for faint stars
• 2022: Our Galaxy Is on a Collision Course. And Its Not the First Time
• 2021: The Telescope That Will Change Astronomy (Black Holes sidebar)
• 2021: Three Dwarf Spheroidal Galaxies Are Found To Rotate
• 2020: Sagittarius dSph 3D structure from Gaia DR2 and Machine Learning
• 2019: NASA to Unveil the Secrets of Nearby Dwarf Galaxies and Properties of Dark Matter (Webbtelescope)
• 2019: Milky Way's Center Will Be Revealed by NASA's Webb Telescope (Webbtelescope)
• 2019: How much weight would the Milky Way weigh if the Milky Way could be weighed? (Hubblesite) (ESA Release)
• 2019: Gaia clocks new speeds for Milky Way-Andromeda collision
• 2018: Gaia catches the movement of the tiny galaxies surrounding the Milky Way
• 2018: Gaia delivers a trove of data revealing secrets of the Milky Way
• 2016: Gaia data made it quickly into a scientific study: Proper Motion and Rotation of the Magellanic Clouds
• 2015: The Milky Way's Missing Mass: Partially Found
• 2015: Hubble Video Shows Shock Collision Inside Black Hole Jet (Hubblesite)
• 2014: Hubble Watches Stars' Clockwork Motion in Nearby Galaxy (Hubblesite)
• 2013: Astronomers create movie of M87s jet (Hubblesite)
• 2013: Stellar Motions in Outer Halo Shed New Light on Milky Way Evolution (Hubblesite)
• 2012: Galaxy Grande: Milky Way May Be More Massive Than Thought
• 2012: Milky Way on Collision Course with Andromeda Galaxy (APOD) (Hubblesite)
• 2012: Tarantula Nebula: Turbulent Star-making Region (APOD) (Hubblesite)
• 2010: Milky Way Sidelined in Galactic Tug-of-War
• 2010: Hubble Data Used to Look 10,000 Years into the Future (Hubblesite)
• 2010: Mystery Medium - Center of Omega Cen
• 2007: Magellanic Clouds Are First-Time Visitors
• 2007: The Proper Motion of the Magellanic Clouds

Videos

• 2019: Hubble & Gaia weigh the Milky Way
• 2019: Measuring the Movement of Globular Star Clusters Visualization
• 2018: Orbits of 39 Milky Way satellites from GAIA DR2 (interactive: drag, scroll, pinch to change view)
• 2015: Shock Collision Inside Black Hole Jet (HubbleHangout)
• 2014: The Rotation Rate of the Large Magellanic Cloud
• 2013: Zoom into and Proper Motion of M87 black hole jet
• 2012: Measuring the Drift of the Andromeda Galaxy
• 2012: N-body model of Milky Way-M31 collision (additional N-body runs.movies here)
• 2012: Nighttime Sky View of Future Galaxy Merger
• 2012: Scientists Reflect on Expected Collision Between the Milky Way and the Andromeda Galaxy
• 2012: Crash of the Titans
• 2012: Milky Way-M31 collision NASA Press Conference (youtube video; 05/31/2012; 51 min.)
• 2012: Milky Way-M31 collision TV coverage
• 2010: Omega Centauri Observation Zoom Sequence and Future Star Motions
• 2010: Constructing the Hertzsprung-Russell Diagram for Globular Star Cluster
• 2010: Omega Centauri: Delving into an Archeological Fossil of the Universe
• 2010: Formation of the Magellanic Stream through LMC/SMC interaction (Besla et al. 2010)

Refereed Gaia Papers

Data Release 3

• The Mass of the Large Magellanic Cloud from the Three-Dimensional Kinematics of its Globular Clusters (Watkins et al., 2024, ApJ, 963, 84)
• Stellar graveyards: Clustering of compact objects in globular clusters NGC 3201 and NGC 6397 (Vitral et al. 2022, MNRAS, 514, 806)
• Internal rotation of MW dSph satellites with Gaia EDR3 (Martinez-Garcia et al. 2021, MNRAS, 505, 5884)
• GaiaHub: A method for combining data from the Gaia and Hubble space telescopes to derive improved proper motions for faint stars (del Pino et al., 2022, ApJ, 933, 76}
• Kinematic Structure of the Large Magellanic Cloud Globular Cluster System from Gaia eDR3 and Hubble Space Telescope Proper Motions (Bennet et al., 2022, 935, 149)

Data Release 2

• Mapping Gaia parallax systematic errors over the sky with faint Milky Way stars (Fardal et al. 2021, AJ, 161, 58)
• Revealing the structure and internal rotation of the Sagittarius dwarf spheroidal galaxy with Gaia and machine learning (del Pino et al. 2021, ApJ, 908, 244)
• Deciphering the Kinematic Structure of the Small Magellanic Cloud through its Red Giant Population (Zivick et al. 2021, ApJ, 910, 36)
• The absolute proper motions of the Arches and Quintuplet clusters (Libralato et al. 2020, MNRAS, 497, 4733)
• The Orbital Histories of Magellanic Satellites Using Gaia DR2 Proper Motions (Patel et al. 2020, ApJ, 893, 121)
• The course of the Orphan Stream in the Northern Galactic Hemisphere traced with Gaia DR2 (Fardal et al. 2019, MNRAS, 486, 936)
• The Proper Motion Field Along the Magellanic Bridge: a New Probe of the LMC-SMC Interaction (Zivick et al. 2018, ApJ, 874, 78)
• Space astrometry of the very massive 150 Msun candidate runaway star VFTS682 (Renzo et al. 2019, MNRAS, 481, 2125)
• The internal rotation of globular clusters revealed by Gaia DR2 (Bianchini et al. 2018, MNRAS, 481, 2125)
• Gaia DR2 reveals a very massive runaway star ejected from R136 (Lennon et al. 2018, A&A, 619, 78)
• First Gaia Dynamics of the Andromeda System: DR2 Proper Motions, Orbits, and Rotation of M31 and M33 (van der Marel et al. 2019, ApJ, 872, 24)
• The Missing Satellites of the Magellanic Clouds? Gaia Proper Motions of the Recently Discovered Ultra-Faint Galaxies (Kallivayalil et al. 2018, ApJ, 867, 19)
• Gaia DR2 Proper Motions of Dwarf Galaxies within 420 kpc: Orbits, Milky Way Mass, Tidal Influences, Planar Alignments, and Group Infall (Fritz et al. 2018, A&A, 619, 103)
• Evidence for an Intermediate-Mass Milky Way from Gaia DR2 Halo Globular Cluster Motions (Watkins et al. 2019, ApJ, 873, 118)

Data Release 1

• Gaia TGAS search for Large Magellanic Cloud runaway supergiant stars: Candidate hypervelocity star discovery, and the nature of R71 (Lennon et al. 2017, A&A, 603, 75)
• Tycho-Gaia Astrometric Solution parallaxes and proper motions for 5 Galactic globular clusters (Watkins & van der Marel 2017, ApJ, 839, 89)
• First Gaia Local Group Dynamics: Magellanic Clouds Proper Motion and Rotation (van der Marel & Sahlmann 2016, ApJL, 832, L23)

Refereed JWST Papers

• JWST Proper Motion Studies: I. High-Precision NIRISS Calibration and Large Magellanic Cloud Kinematics (Libralato et al., 2023, 950, 101) [joint with JWST Telescope Scientist Team]

Refereed Hubble Papers

• HSTPROMO Internal Proper Motion Kinematics of Dwarf Spheroidal Galaxies: I. Velocity Anisotropy and Dark Matter Cusp Slope of Draco (Vitral, 2024, ApJ, in press)
• Proper Motions and Orbits of Distant Local Group Dwarf Galaxies from a combination of Gaia and Hubble Data (Bennet et al., 2024, ApJ, in press)
• BP3M: Bayesian Positions, Parallaxes, and Proper Motions derived from the Hubble Space Telescope and Gaia data (McKinnon et al., 2024, ApJ, in press)
• An elusive dark central mass in the globular cluster M4 (Vitral et al., 2023, MNRAS, 522, 5740)
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIII. Proper-motion catalogs and internal kinematics (Libralato et al., 2022, ApJ, 934, 150) [joint with Piotto et al. collaboration]
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. VII. Energy Equipartition (Watkins et al., 2022, ApJ, 936, 154)
• The internal proper motion kinematics of NGC 346: past formation and future evolution (Sabbi et al., 2022, ApJ, 936, 135)
• Hunting for intermediate-mass black holes in globular clusters: an astrometric study of NGC 6441 (Haberle et al., 2021, MNRAS, 503, 1490)
• 2D kinematics of massive stars near the Galactic Center (Libralato et al., 2021, MNRAS, 500, 3213)
• HST Proper Motions of NGC 147 and NGC 185: Orbital Histories and Tests of a Dynamically Coherent Andromeda Satellite Plane (Sohn et al., 2020, ApJ, 901, 43)
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVIII. Proper-motion Kinematics of Multiple Stellar Populations in the Core Regions of NGC 6352 (Libralato et al. 2019, ApJ, 873, 109)
• HALO7D II: The Halo Velocity Ellipsoid and Velocity Anisotropy with Distant Main Sequence Stars (Cunningham et al. 2019, ApJ, 879, 120)
• The Proper Motion Field of the Small Magellanic Cloud: Kinematic Evidence for Its Tidal Disruption (Zivick et al. 2018, ApJ, 864, 55)
• HST Astrometry in the 30 Doradus Region. II. Runaway Stars from New Proper Motions in the Large Magellanic Cloud (Platais et al. 2018, AJ, 156, 98)
• Absolute Hubble Space Telescope Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass (Sohn et al. 2018, 862, 52)
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Cluster. VI. Improved Data Reduction and Internal-kinematic Analysis of NGC 362 (Libralato et al. 2018, ApJ, 861, 99)
• Connecting the Milky Way potential profile to the orbital timescales and spatial structure of the Sagittarius Stream (Fardal et al. 2019, MNRAS, 483, 4724)
• The HST Large Programme on Omega Centauri. III. Absolute Proper Motion (Libralato et al. 2018, ApJ, 854, 45) [joint with Bedin et al. collaboration]
• The HST Large Programme on Omega Centauri. II. Internal Kinematics (Bellini et al. 2018, ApJ, 853, 86) [joint with Bedin et al. collaboration]
• SMHASH: Anatomy of the Orphan Stream using RR Lyrae stars (Hendel et al. 2018, MNRAS, 479, 570) [joint with SMHASH collaboration]
• Space Motions of the Dwarf Spheroidal Galaxies Draco and Sculptor based on HST Proper Motions with ~10-year Time Baseline (Sohn et al. 2017, ApJ, 849, 93)
• Hubble Space Telescope Proper Motion (HSTPROMO) catalogs of galactic globular clusters. V. The Rapid Rotation of 47 Tuc Traced and Modeled in Three Dimensions (Bellini et al. 2017, ApJ, 844, 167)
• The Ultimate HST Astro-Photometric Analysis of the Core of Omega Centauri. III. The Main Sequence's Multiple Populations Galore (Bellini et al. 2017, ApJ, 844, 164)
• The Ultimate HST Astro-Photometric Analysis of the Core of Omega Centauri. II. Differential-Reddening Map(Bellini et al. 2017, ApJ, 842, 7)
• The Ultimate HST Astro-Photometric Analysis of the Core of Omega Centauri. I. The Catalog (Bellini et al. 2017, ApJ, 842, 6)
• Hubble Space Telescope Proper Motions of Individual Stars in Stellar Streams: Orphan, Sagittarius, Lethe, and the New "Parallel" Stream (Sohn et al. 2016, ApJ, 833, 235)
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. IV. Kinematic profiles and average masses of blue straggler stars (Baldwin et al. 2016, ApJ, 827, 12)
• The Effect of Unresolved Binaries on Globular Cluster Proper-Motion Dispersion Profiles (Bianchini et al. 2016, ApJL, 820, 22)
• Isotropic at the Break: 3D Kinematics of Milky Way Halo Stars in the Foreground of M31 (Cunningham et al. 2016, ApJ, 820, 18)
• Ram Pressure Stripping of the Large Magellanic Cloud's Disk as a Probe of the Milky Way's Circumgalactic Medium (Salem et al. 2015, ApJ, 815, 77)
• An HST Proper-Motion Study of the Large Scale Jet of 3C273 (Meyer et al. 2016, ApJ, 818, 195)
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. III. Dynamical distances and mass-to-light ratios (Watkins et al. 2015, ApJ, 812, 149)
• The Hubble Space Telescope UV Legacy Survey of galactic globular clusters. VI. The internal kinematics of the multiple stellar populations in NGC 2808 (Bellini et al. 2015, ApJ Letters, 810, L13)
• A kiloparsec-scale internal shock collision in the jet of a nearby radio galaxy (Meyer et al. 2015, Nature, 521, 495)
• HST astrometry in the 30 Doradus region: measuring proper motions of individual stars in the Large Magellanic Cloud (Platais et al. 2015, AJ, 150, 89)
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. II. Kinematic profiles and maps (Watkins et al. 2015, ApJ, 803, 29)
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. I. Sample Selection, Data Reduction and NGC 7078 Results (Bellini et al. 2014, ApJ, 797, 115)
• Hubble Space Telescope Proper Motions along the Sagittarius Stream: I. Observations and Results for Stars in Four Fields (Sohn et al. 2015, ApJ, 803, 56)
• Third-Epoch Magellanic Cloud Proper Motions II: The Large Magellanic Cloud Rotation Field in Three Dimensions (van der Marel & Kallivayalil 2014, ApJ, 781, 121)
• Optical Proper Motion Measurements of the M87 Jet: New Results from the Hubble Space Telescope (Meyer et al. 2013, ApJL, 774, L21)
• HST Absolute Proper Motions of NGC 6681 and the Sagittarius Dwarf Galaxy (Massari et al. 2013, ApJ, 779, 81)
• No Energy Equipartition in Globular Clusters (Trenti & van der Marel, 2013, MNRAS, 435, 3272)
• Hubble Tarantula Treasury Project: Unraveling Tarantula's Web. I. Observational overview and first results (Sabbi et al. 2013, AJ, 146, 53)
• The Velocity Anisotropy of Distant Milky Way Halo Stars from Hubble Space Telescope Proper Motions (Deason et al. 2013, 766, 24)
• The Space Motion of Leo I: The Mass of the Milky Way's Dark Matter Halo (Boylan-Kolchin et al. 2013, ApJ, 768, 140)
• The Space Motion of Leo I: Hubble Space Telescope Proper Motion and Implied Orbit (Sohn et al. 2013, ApJ, 768, 139)
• Third-Epoch Magellanic Cloud Proper Motions I: HST/WFC3 data and Orbit Implications (Kallivayalil et al. 2013, 764, 161)
• The M31 Velocity Vector. III. Future Milky Way-M31-M33 Orbital Evolution, Merging, and Fate of the Sun (van der Marel et al. 2012, ApJ, 753, 9)
• The M31 Velocity Vector. II. Radial Orbit towards the Milky Way and Implied Local Group Mass (van der Marel et al. 2012, ApJ, 753, 8)
• The M31 Velocity Vector. I. Hubble Space Telescope Proper Motion Measurements (Sohn et al. 2012, ApJ, 753, 7)
• The role of dwarf galaxy interactions in shaping the Magellanic System and implications for Magellanic Irregulars (Besla et al. 2012, MNRAS, 421, 2109)
• Simulations of the Magellanic Stream in a First Infall Scenario (Besla et al. 2010, ApJ, 721, 97)
• New Limits on an Intermediate Mass Black Hole in Omega Centauri: II. Dynamical Models (van der Marel & Anderson 2010, ApJ, 710, 1063)
• New Limits on an Intermediate Mass Black Hole in Omega Centauri: I. Hubble Space Telescope Photometry and Proper Motions (Anderson & van der Marel 2010, ApJ, 710, 1032)
• Using Resolved Galaxies in Hubble Space Telescope Images to Measure Absolute Proper Motions (Mahmud & Anderson 2008, PASP, 120, 907)
• Constraining the Mass Profiles of Stellar Systems: Schwarzschild Modeling of Discrete Velocity Data Sets (Chaname et al. 2008, ApJ, 682, 841)
• M31 Transverse Velocity and Local Group Mass from Satellite Kinematics (van der Marel & Guhathakurta 2008, ApJ, 678, 187)
• Are the Magellanic Clouds on their First Passage about the Milky Way? (Besla et al. 2007, 668, 949)
• Is the SMC bound to the LMC? The HST proper motion of the SMC (Kallivayalil et al. 2006, ApJ, 652, 1213)
• The Proper Motion of the Large Magellanic Cloud using HST (Kallivayalil et al. 2006, ApJ, 638, 722)
• Toward High-Precision Astrometry with WFPC2. I. Deriving an Accurate Point-Spread Function (Anderson & King, 2000, PASP, 112, 1360)

Review Papers

• Local Group Proper Motion Dynamics (van der Marel 2014, in Proc. IAU Symp. 311)
• Local Group and Star Cluster Dynamics from HSTPROMO: The Hubble Space Telescope Proper Motion Collaboration (van der Marel et al. 2014, in ASP Conf. Series Vol. 480, p.43)

Hubble Projects

• 17781 A superluminal jet in 3C264: the view at 30 (GO; PI: Meyer; CoI list)
• 17513 Proper Motions of Galaxies in the M81 Group: Unleashing the Full Power of HSTs 20-year Time Baseline (GO; PI: Bennet; CoI list)
• 17501 Lone Lion or Part of a Pride: Proper Motion and Orbit of Leo P (GO; PI: Bennet; CoI list)
• 17434 Shedding Light on Dark Matter: Internal Proper Motions in Ursa Minor (GO; PI: Vitral; CoI list)
• 17197 Proper Motions of Extragalactic Jets with HST: A New Epoch (GO; PI: Meyer; CoI list)
• 17174 New Kids on the Block? Proper Motions of First Infall Galaxies in the Local Group (GO; PI: Bennet; CoI list)
• 16791 Cold Dark Matter and the GD-1 Stellar Stream - 2nd epoch observations (GO; PI: Bonaca; CoI list) [joint with Bonaca et al. collaboration]
• 16737 Internal Proper Motion Kinematics of Dwarf Spheroidal Galaxies: Constraining the Density and Properties of Dark Matter (GO; PI: Sohn; CoI list)
• 16625 Combining HST and Gaia to Measure Proper Motions of Distant Halo Stars: Resolving Kinematic Inhomogeneity in the Milky Way (AR; PI: McKinnon; CoI list)
• 16298: Enhancing the astrometric legacy of HST for globular clusters (SNAP; PI: Libralato; CoI list)
• 16274: Resolved Proper Motions of M33 (GO; PI: Sohn; CoI list)
• 16273: Andromeda and the Seven Dwarfs: M31 Mass, Satellite Orbits, and the Nature of the Satellite Plane (GO; PI: Sohn; CoI list)
• 15930: Cold Dark Matter and the GD-1 Stellar Stream (GO; PI: Bonaca; CoI list) [joint with Bonaca et al. collaboration]
• 15911: Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching (GO; PI: del Pino Molina; CoI list)
• 15902: Tracing the 6-D Orbital and Formation History of the Complete M31 Satellite System (GO; PI: Weisz; CoI list) [joint with Weisz et al. collaboration]
• 15857: Internal Kinematics of Outer Fields in Globular Clusters: The Last Piece of the Multi-Population Puzzle (GO; PI: Bellini; CoI list)
• 15658: Resolved Proper Motions of M31 and the M31-M32 Interaction (GO; PI: Sohn; CoI list)
• 15633: The stellar dream team: Combining HST and Gaia to derive precise Proper Motions of resolved stellar populations (AR Legacy; PI: del Pino; CoI list)
• 15507: Proper Motions of the Crater-Leo Group: Testing the Group Infall Scenario - 2nd epoch observations (GO; PI: Sohn; CoI list)
• 15495: An HST proper-motion and spectral study of the optical jet in 4C +00.58 - 2nd epoch observations (GO; PI: Meyer; CoI list)
• 15354: The fate of NGC602, an intense region of star-formation in the Wing of the SMC (GO; PI: Sabbi; CoI list)
• 15191: Monitoring an Internal Shock Collision in Action in 3C 264 - 2nd epoch observations (GO; PI: Meyer; CoI list)
• 15055: A Unified Picture of Mass Segregation in Globular Clusters (Theory; PI: Watkins; CoI list)
• 15017: Models of Stellar Streams for Constraining Local Group Dynamics with HST Proper Motion Data(Theory; PI: Fardal; CoI list)
• 14775: The Proper Motion Field along the Magellanic Bridge: a New Probe of the LMC-SMC interaction - 2nd epoch observations (GO; PI: van der Marel; CoI list)
• 14770: Proper Motions of the Crater-Leo Group: Testing the Group Infall Scenario (GO; PI: Sohn; CoI list)
• 14769: Proper Motions of Two Local Prototype Dwarf Elliptical Galaxies NGC 147 and NGC 185 (GO; PI: Sohn; CoI list)
• 14734: Milky Way Cosmology: Laying the Foundation for Full 6-D Dynamical Mapping of the Nearby Universe (GO; PI: Kallivayalil; CoI list)
• 14671: An HST proper-motion and spectral study of the optical jet in 4C +00.58 (GO; PI: Meyer; CoI list)
• 14343: Proper Motion and Internal Kinematics of the SMC: are the Magellanic Clouds bound to one another? - 2nd epoch observations (GO; PI: Kallivayalil; CoI list)
• 14322: Finding needles in haystacks: intermediate-mass black holes in Galactic globular clusters (Theory; PI: Watkins; CoI list)
• 14236: The First Proper Motions of Ultra-faint Dwarf Galaxies: Probing Reionization and Planar Associations of Satellites (GO; PI: Sohn; CoI list)
• 14235: Globular Cluster Orbits from HST Proper Motions: Constraining the Formation and Mass of the Milky Way Halo (GO; PI: Sohn; CoI list)
• 14159: Monitoring an Internal Shock Collision in Action in 3C 264 (GO; PI: Meyer; CoI list)
• 14158: Mapping the kpc-scale Velocity Structure of Jets with HST (GO; PI: Meyer; CoI list)
• 13834: The Proper Motion Field along the Magellanic Bridge: a New Probe of the LMC-SMC interaction (GO; PI: van der Marel; CoI list)
• 13771: Proper Motions of Isolated Massive Stars near the Galactic Center - 2nd epoch observations (GO; PI: Lennon; CoI list)
• 13770: Measuring the Milky Way Mass with the Proper Motion of Leo T - 2nd epoch observations (GO; PI: Do; CoI list)
• 13731: The Real Impact of Extragalactic Jets on Their Environments: Measuring the Advance Speed of Hotspots with HST (GO; PI: Meyer; CoI list)
• 13680: A 3D view of massive cluster formation in the SMC (GO; PI: Sabbi; CoI list)
• 13476: Proper Motion and Internal Kinematics of the SMC: are the Magellanic Clouds bound to one another? (GO; PI: Kallivayalil; CoI list)
• 13443: Proper Motions along the Orphan Stream: Finding the Parent, Orbit, and Milky Way Halo Shape (GO; PI: van der Marel; CoI list)
• 13359: Proper Motions of Massive Stars in 30 Doradus --- 2nd epoch observations (GO; PI: Lennon; CoI list)
• 13327: Proper Motions at 500 Mpc: Measuring Superluminal motions in Optical Jets with HST (GO; PI: Meyer; CoI list)
• 13272: Proper Motions of Distant Halo Stars: New Clues to Milky Way Structure, Evolution and Mass (AR; PI: van der Marel; CoI list)
• 12966: The Nature of Dark Matter: Halo Cusps or Cores from dSph internal proper motion dynamics (GO; PI: van der Marel; CoI list)
• 12915: Proper Motions of Isolated Massive Stars near the Galactic Center (GO; PI: Lennon; CoI list)
• 12914: Measuring the Milky Way Mass with the Proper Motion of Leo T (GO; PI: Do; CoI list)
• 12845: Hunting for Intermediate-Mass Black Holes: Archival Proper-Motion Analysis of Globular Clusters (AR; PI: Bellini; CoI list)
• 12656: The Ultimate Catalog of Omega Centauri: 15-band Photometry and Proper Motions (AR; PI: Anderson; CoI list)
• 12635: The Complete Velocity Field of the M87 Optical Jet (GO; PI: Sparks; CoI list)
• 12632: Modeling the Star Formation Histories and Kinematics of the Magellanic Clouds (Theory; PI: Besla; CoI list)
• 12564: Proper Motions along the Sagittarius Stream: Constraining Milky Way Parameters and Dark Halo Shape (GO; PI: van der Marel; CoI list)
• 12499: Proper Motions of Massive Stars in 30 Doradus (GO; PI: Lennon; CoI list)
• 12274: Proper motion study of M54: an intermediate-mass black hole in the nucleus of the Sagittarius Dwarf Galaxy? (GO; PI: van der Marel; CoI list)
• 12273: Mass of the Local Group from Proper Motions of Distant Dwarf Galaxies (GO; PI: van der Marel; CoI list)
• 12270: Proper Motion of Leo I: Constraining the Milky Way Mass (GO; PI: Sohn; CoI list)
• 12156: N-body modeling of globular clusters: detecting intermediate-mass black holes by non-equipartition in HST proper motions (Theory; PI: Trenti; CoI list)
• 11988: Searching for Intermediate Mass Black Holes in Globular Clusters via Proper Motions (GO; PI: Chandar; CoI list)
• 11801: Black Holes in Globular Clusters (GTO; PI: Ford; CoI list)
• 11730: Continued Proper Motions of the Magellanic Clouds: Orbits, Internal Kinematics, and Distance (GO; PI: Kallivayalil; CoI list)
• 11684: The First Proper Motion Measurement for M31: Dynamics and Mass of the Local Group (GO; PI: van der Marel; CoI list)
• 11609: NGC 6266: The Smoking Gun of Intermediate-Mass Black Holes in Galactic Globular Clusters? (GO; PI: Chaname; CoI list)
• 11201: Systemic and Internal motions of the Magellanic Clouds: Third Epoch Images (GO; PI: Kallivayalil; CoI list)
• 10841: A Proper Motion Search for Intermediate Mass Black Holes in Globular Clusters --- 2nd Epoch Observations (GO; PI: Chandar; CoI list)
• 10401: A Proper Motion Search for Intermediate Mass Black Holes in Globular Clusters (GO; PI: Chandar; CoI list)
• 10335: Black Holes in Globular Clusters (GTO; PI: Ford; CoI list)
• 10130: Systemic Proper Motions of the Magellanic Clouds from Astrometry with ACS: II. Second Epoch Images (SNAP; PI: Alcock; CoI list)
• 9952: Stellar Dynamical Models for HST Proper Motion Datasets (Theory; PI: van der Marel; CoI list)
• 9462: Systemic and Internal Proper Motions of the Magellanic Clouds from Astrometry with ACS (SNAP; PI: Alcock; CoI list)

James Webb Projects

• 1304: Internal Dynamics of Milky Way Dwarf Spheroidal Galaxies (GTO; PI: van der Marel; CoI list)
• 1305: Dynamics of the Andromeda Galaxy Satellite System (GTO; PI: van der Marel; CoI list)
• 1306: Galactic Center Astrometry (GTO; PI: van der Marel; CoI list)
• 2772: Galactic Center Astrometry (2nd epoch) (GTO; PI: van der Marel; CoI list)
• 4513: Internal Dynamics of Milky Way Dwarf Spheroidal Galaxies (GTO; PI: van der Marel; CoI list)
• 4514: Dynamics of the Andromeda Galaxy Satellite System (GTO; PI: van der Marel; CoI list)
• 4515: Galactic Center Astrometry (GTO; PI: van der Marel; CoI list)

Funding

• Support for Hubble GO/AR/Theory projects is provided by NASA through grants from by STScI, which is operated by AURA, Inc., under NASA contract NAS 5-26555. Grants are awarded to individual investigator institutions.
• Support for JWST GTO projects is provided by NASA through grant 80NSSC20K0586 to the JWST Telescope Scientist Team.
• Grants to date for the programs listed above have totalled 9.8 million dollars.