A combined HST and JWST study of the composition of the faintest trans-Neptunian objects: Testing hypotheses for the formation of the Solar System

This target is not used in this proposal. v8 [final]: 16:53 friday 354929494 Assigned ID: 1652 ----- Attempting Submission 1 (Thu Apr 08 16:55:57 GMT 2021) ----- HST Phase I Proposal 1652 successfully submitted. Receipt: # 1652-1 ----- Attempting Submission 2 (Fri Apr 09 20:49:46 GMT 2021) ----- HST Phase I Proposal 1652 successfully submitted. Receipt: # 1652-2 ----- Attempting Submission 3 (Fri Apr 09 23:28:48 GMT 2021) ----- HST Phase I Proposal 1652 successfully submitted. Receipt: # 1652-3 ----- Attempting Submission 4 (Fri Apr 09 23:43:23 GMT 2021) ----- HST Phase I Proposal 1652 successfully submitted. Receipt: # 1652-4 ----- Attempting Submission 5 (Fri Apr 09 23:46:43 GMT 2021) ----- HST Phase I Proposal 1652 successfully submitted. Receipt: # 1652-5 ----- Attempting Submission 6 (Fri Apr 09 23:49:05 GMT 2021) ----- HST Phase I Proposal 1652 successfully submitted. Receipt: # 1652-6 ----- Attempting Submission 7 (Fri Apr 09 23:51:50 GMT 2021) ----- HST Phase I Proposal 1652 successfully submitted. Receipt: # 1652-7 ----- Attempting Submission 8 (Fri Apr 09 23:54:02 GMT 2021) ----- Two targets are provided here, to match the JWST program. We present here observations for just one of these targets, but the configuration is essentially the same of the other target. Only one target will be observed. v4 of Phase II. Finalized target selection, mosaic parameters, pattern parameters. v3 of Phase II. ORIENT and BETWEEN requirements removed for both 0h and 12h fields, pending iterations with STScI and the JWST program. v2 of Phase II, adding the 0H visit as an alternate target. Both visits are ON HOLD at the moment. Remaining issues include: ORIENT constraints for the 0H field; SAA; splitting exposures; dithering. v1 of Phase II, after consultation with Tony and Joel. There are still a few remaining nuances to be addressed, including the SAA and splitting the long observations into several shorter ones to deal with CRs. 50419764 ----- Attempting Submission 1 (Tue Jul 27 20:53:54 GMT 2021) ----- ----- Attempting Submission 2 (Thu Sep 09 23:42:42 GMT 2021) ----- ----- Attempting Submission 3 (Tue Sep 21 21:52:23 GMT 2021) ----- ----- Attempting Submission 4 (Tue Dec 20 21:17:51 GMT 2022) ----- The other 18 errors are related to the SAA, for each of the nine tiles (in two visits). This will be addressed with Tony later, as the program becomes more defined. A combined HST and JWST study of the composition of the faintest trans-Neptunian objects: Testing hypotheses for the formation of the Solar System The outermost region in our Solar System retains the most pristine signatures of planetary system formation and evolution. This trans-Neptunian region and its inhabitants (trans-Neptunian objects, or TNOs) therefore offer some of the best records of the earliest stages of the formation of our Solar System. There are two very different theories for how the outermost Solar System formed and evolved, and the color distribution of very small TNOs is the diagnostic key to discriminating between these two models. We propose here 99 HST orbits to address this outstanding question in planetary system formation. We will use WFC3 and ACS in a coordinated parallel program to map most of the footprint of a JWST TNO discovery program. TNO colors will be derived by combining our HST photometry with photometry from that JWST program. We will measure the colors of at least 15 TNOs as small as 10 km and will provide a definitive test of current models of the evolution of the outer Solar System. The HST observations must be made simultaneously with the JWST observations to derive both TNO colors and parallaxes. This program can only be carried out with HST, and only by combining data from both HST and JWST. The result from this program will have broad implications across multiple fields of astronomy and showcase the unique joint capabilities of NASA's premier observatories. No other facility is capable of such sensitive measurements, and this program leverages a significant investment of allocated JWST time. This coordinated parallel program is connected to JWST program 1568. JWST will observe a large mosaic on the sky with NIRCam. This HST program will use WFC3 to observe ~one third of the JWST region and, at the same time, use ACS to observe a different ~one third of the JWST region. Both WFC3 and ACS will use 3x3 mosaic grids. The HST observations must be made close in time to the JWST observations. This requires some amount of careful thought for the scheduling, rotation angles, etc. The JWST observing "season" last about 10 days, with three epochs on days 0, 5, and 10 (more or less). Our HST observations should begin no more than one day before and end no more than one day after the JWST observations. Each tile in the 3x3 grid is allocated 11 orbits. These 11 orbits should not be interrupted. Small interruptions between tiles are acceptable, if necessary, bearing in mind the overall timing requirement above. Two possible fields exist: R~0h and RA~12h. Only one of these will be observed. Probably, the decision about which field is observed will be driven by the JWST timeline, including launch, commissioning, etc. Trilling (PI) has extensive experience with surveys for Solar System small bodies. He leads the ongoing Deep Ecliptic Exploration Project (a NOIRLab/DECam TNO survey) and the HST TNO Pure Parallel program cited in the proposal. He was a member of the Bernstein et al. HST TNO search program. He is co-PI of JWST program #1568. Bernstein (CoI) pioneered the use of shift-and-stack for deep HST TNO studies (Bernstein et al. 2004). Fraser (CoI) has used HST and other data sources to present colors and size distributions of TNOs in a number of papers. He is co-PI of JWST program #1568. Fuentes (CoI) led several HST archive programs to measure the size distribution of TNOs and is part of the HST TNO Pure Parallel program. Grundy (CoI) has used HST over many cycles to measure colors and binarity of TNOs. He is the composition theme team lead for the New Horizons spacecraft mission. Holman (CoI) is an expert in orbital dynamics and observational studies of distant outer Solar System bodies. He was a member of the Bernstein et al. HST team. Stansberry (CoI) is PI of JWST program #1568 and is a member of the JWST/NIRCam instrument team. He has studied TNOs with a number of space-based telescopes. Tegler (CoI) is an expert in photometry of distant Solar System objects. Solar System Astronomy 0 false false false false false false false SUPPORTED SOLAR SYSTEM OTHER J2000 J2000 WFC3/UVIS Imaging No No F350LP ACS/WFC Imaging No No F814W POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 1

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