17425( 3) - 11-Jun-2024 19:05:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17425 Version: 3 Check-in Time: 11-Jun-2024 19:05:42 STScI Edit Number: 1 Title Mapping the Collision of the Nearest Interstellar Medium Clouds ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Seth Redfield Wesleyan University Y CoI: Dr. Pawel Swaczyna Space Research Centre PAS (CBK PAN) N CoI: Dr. Brian Erland Wood Naval Research Laboratory N CoI: Dr. Jeffrey L. Linsky University of Colorado at Boulder N CoI: Dr. Azmain Nisak Wesleyan University N ------------------------------------------------------------------------------------ Abstract Evidence is emerging from different observations that the clouds in the local interstellar medium, which surround the Sun and the nearest stars, are young, low-density, and colliding with each other. Indeed, the Sun may be currently moving through the collision zone of the Local Interstellar Cloud and the G Cloud. Archival observations support the high column density that would result from this interaction, but the densest region of the interaction remains unobserved. We propose to obtain high resolution spectra of four nearby stars in this region to measure the kinematic and physical properties of the interaction zone. Coupling E230H and E140M spectra will enable a direct test of the mixing by modeling the absorption features in narrow and strong LISM features (i.e., MgII) while also leveraging the numerous ions that are likely to show LISM absorption (e.g., HI, DI, CII, NI, OI, SiII) to obtain gas abundances, depletion patterns, temperatures, and turbulent velocities. The kinematics and the fundamental physical properties in the collision zone can be compared to the average cloud properties already derived in the literature. The collision and mixing of LISM clouds have important implications for our understanding of the timing and magnitude that the heliosphere expands and contracts. This, in turn, impacts the severity of the modulation of energetic cosmic rays into the solar system and on to the tops of planetary atmospheres. The proposed observations will test a new model of LISM cloud collisions that could significantly change the view we have of our immediate Galactic neighborhood. ------------------------------------------------------------------------------------ Observations Description ------------------------ Target Selection and Availability: We plan to observe four nearby stars that lie along the collision zone of the nearest LISM clouds, the LIC and G clouds. The most important factors in target selection were location along this narrow strip that defines the longest path length through the mixed region and proximity. Three of our targets are <15 pc and the fourth is <20 pc away. Desired Spectral Coverage and Resolution: The high spectral resolution capabilities of STIS are necessary to model the ISM absorption line profiles. Only by resolving the velocity components of the mixed LIC and G clouds, can accurate physical measurements of gas abundances, dust depletion, temperature, and turbulent velocity be made. We will use the high resolution E230H grating 17425( 3) - 11-Jun-2024 19:05:42 - [ 2] to observe MgII and FeII. These heavy ions are not significantly broadened thermally, and provide sharp line profiles to resolve the velocity structure of the ISM along the line of sight. These transitions will be key to our kinematic analysis of the mixed absorption profiles. Hydrogen has a broad absorption profile, and does not necessarily require high spectral resolution, and therefore, to maximize S/N, we plan to use the E140M setting. Due to the wide spectral range of STIS, we would obtain practically the entire far-UV band from 1150-1700 A and several more ISM absorption lines (e.g., DI, CII, NI, OI, SiII, SiIII, AlII) in addition to Lyman-alpha. The velocity structure of the absorption can be derived by absorption of FeII and MgII at high spectral resolution and used for all transitions detected at medium resolution. Desired Aperture Size and Geocoronal Emission: The narrow aperture sizes of STIS are critical in order to minimize the contamination by the geocoronal Lyman-alpha emission. Depending on the time of year, the Earth's motion can Doppler shift the geocoronal line into the region of astrospheric absorption and contaminate our measurement. Our targets will require a minimal timing constraint to ensure that the geocoronal line is in the core of the ISM absorption (still allowing >7 months to perform observations). Desired Signal-to-Noise and Exposure Times: Because cool stars (even late-A and early-F stars) are emission line sources in the far-UV, estimating expected S/N for our planned spectra requires first estimating Lyman-alpha and MgII fluxes, which we can do by extrapolating from previously observed stars. Chromospheric line fluxes (such as MgII and Lyman-alpha) are related to X-ray fluxes. Wood et al. (2005) provide Lyman-alpha spectra for many stars, which serve as the comparison stars for our purposes here. All of our targets have X-ray observations and therefore have well determined X-ray luminosities (L_X). After acquisition, peakup, and observational overhead are considered, we expect at least 28 minutes to be available in the first orbit for the E230H exposure. This provides time to attain high S/N of >25 at the half-maximum (that is, one half FWHM from the line center, because it is unlikely that the ISM absorption will be centered at the same velocity as the star) of the strong MgII lines. After acquisition and overheads are considered, we expect at least 41 minutes of exposure time to be available in the second orbit for the E140M exposure, and 48 minutes in subsequent orbits. To obtain a S/N >15, which is required to model the Lyman-alpha profile, requires 2-4 orbits. Brightness Limits: The coolest stars in our sample have UV spectra characterized by minimal continua, but strong emission lines. For this reason, they all fall far short of the global brightness limit. For example, in the E230H setting, our earliest spectral type target (HD73752; G3V) only results in 23, 700 counts s^-1, 12% of the MAMA bright limit. The emission lines for all targets also fall far short of the local brightness limit. The two emission lines of interest in this proposal (Lyman-alpha and MgII) are also the brightest, and therefore, the procedure given above for estimating the S/N near their peaks is also utilized to test for brightness limit violations. Again, HD73752 is the strongest MgII emission line sources in our sample, and in the brightest pixel, only generates 0.7 counts s^-1. ------------------------------------------------------------------------------------ 17425( 3) - 11-Jun-2024 19:05:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD73752 STAR, G V-IV RA=08H39M7.6296S +/- 0.0002538", J2000 V = V = 5.17 +/- 0.99 TYPE=G3V, B-V=0.83, DEC=-22D39'35.70" +/- 0.0002319" 52.13 E(B-V)=0, F-LINE(2796)=2.56e-12, W-LINE(2796)=0.6, F-LINE(1215)=0.65e-12, W-LINE(1215)=0.7 Reference Frame: ICRS Extended: NO Comments: No target star was identified by the BOT in the observed field. DSS images clearly indicate a bright isolated target star (brightest within 100 arcsec). Clearly the target star is the dominant object in the field of view. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -0.017361433195635892 0.459973 0.0509663 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD52698 STAR, K V-IV RA=07H01M13.9682S +/- J2000 V = V = 6.688 TYPE=K1V, B-V=0.89, E(B-V)=0, 0.0001282", DEC=-25D56'54.84" 12.42 F-LINE(2796)=3.59e-12, +/- 0.0001555" W-LINE(2796)=0.6, F-LINE(1215)=2.04e-12, W-LINE(1215)=0.7 Reference Frame: ICRS Extended: NO Comments: IUE SPECTRUM: LWP24840 Target star was identified by the BOT in the observed field. DSS images clearly indicate a bright isolated target star (brightest within 100 arcsec). Clearly the target star is the dominant object in the field of view. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.015269271140055255 0.042341000000000004 0.0678007 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD57095 STAR, K V-IV RA=07H17M29.5343S +/- 0.00554", J2000 V = V = 6.669 TYPE=K1V, B-V=0.977, DEC=-46D58'36.21" +/- 0.00544" 59.00 E(B-V)=0, F-LINE(2796)=3.94e-12, W-LINE(2796)=0.6, F-LINE(1215)=2.24e-12, W-LINE(1215)=0.7 Reference Frame: ICRS Extended: NO Comments: No target star was identified by the BOT in the observed field. DSS images clearly indicate a bright isolated target star (brightest within 100 arcsec). Clearly the target star is the dominant object in the field of view. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -0.0017822192835580863 0.58472 0.06852 ------------------------------------------------------------------------------------------------------------------------------------ 17425( 3) - 11-Jun-2024 19:05:42 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 HD27274 STAR, K V-IV RA=04H15M58.2583S +/- J2000 V = V = 7.634 TYPE=K5V, B-V=1.125, 0.0000135", DEC=-53D18'29.16" -23.09 E(B-V)=0, F-LINE(2796)=1.22e-12, +/- 0.0000135" W-LINE(2796)=0.6, F-LINE(1215)=2.06e-12, W-LINE(1215)=0.7 Reference Frame: ICRS Extended: NO Comments: No target star was identified by the BOT in the observed field. DSS images clearly indicate a bright isolated target star (brightest within 100 arcsec). Clearly the target star is the dominant object in the field of view. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.08753288730564074 0.396695 0.0766638 ------------------------------------------------------------------------------------------------------------------------------------ 17425( 3) - 11-Jun-2024 19:05:42 - [ 5] Visit: 01 Visit Requirements: BETWEEN 19-JUL-2023:00:00:00 AND 04-MAR-2024:00:00:00; BETWEEN 19-JUL-2024:00:00:00 AND 04-MAR-2025:00:00:00; BETWEEN 19-JUL-2025:00:00:00 AND 04-MAR-2026:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD73752 STIS/CCD ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.2 S (0.2 S) Comments: SNR = 209.6709 Brightest Pixel = 18, 286.41 e ------------------------------------------------------------------------------------------------------------------------------------ 2 HD73752 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 1 0.2 S (0.2 K S) Comments: SNR = 137.5656 Brightest Pixel = 2, 383.32 e Global Source Counts = 7, 735, 739.289 e ------------------------------------------------------------------------------------------------------------------------------------ 3 HD73752 STIS/NUV ACCUM 0.2X0.09 E230H 2713 1 1695 S -MAMA see below (1647 S) Comments: SNR = 45.6222 Brightest Pixel = 1, 152.72 e ------------------------------------------------------------------------------------------------------------------------------------ 4 HD73752 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2717 S -MAMA see below (2598 S) Comments: SNR = 9.9279 Brightest Pixel = 51.95 e ------------------------------------------------------------------------------------------------------------------------------------ 5 HD73752 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2717 S -MAMA see below (2618 S) Comments: SNR = 9.9279 Brightest Pixel = 51.95 e ------------------------------------------------------------------------------------------------------------------------------------ 6 HD73752 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2717 S -MAMA see below (2618 S) Comments: SNR = 9.9279 Brightest Pixel = 51.95 e ------------------------------------------------------------------------------------------------------------------------------------ 7 HD73752 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2717 S -MAMA see below (2618 S) Comments: SNR = 9.9279 Brightest Pixel = 51.95 e ------------------------------------------------------------------------------------------------------------------------------------ 17425( 3) - 11-Jun-2024 19:05:42 - [ 6] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD73752 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD73752 2 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 none none none none 1 N/A K HD73752 3 STIS/NUV ACCUM 0.2X0.09 E230H 2713 none none none none 1 1647.0 S -MAMA HD73752 4 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 2 2598.0 S -MAMA HD73752 5 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 3 2618.0 S -MAMA HD73752 6 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 4 2618.0 S -MAMA HD73752 7 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 5 2618.0 S -MAMA 17425( 3) - 11-Jun-2024 19:05:42 - [ 7] Visit: 02 Visit Requirements: BETWEEN 17-JUN-2023:00:00:00 AND 04-FEB-2024:00:00:00; BETWEEN 17-JUN-2024:00:00:00 AND 04-FEB-2025:00:00:00; BETWEEN 17-JUN-2025:00:00:00 AND 04-FEB-2026:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD52698 STIS/CCD ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.4 S (0.4 S) Comments: SNR = 152.3254 Brightest Pixel = 9, 499.47 e ------------------------------------------------------------------------------------------------------------------------------------ 2 HD52698 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 1 0.2 S (0.2 K S) Comments: SNR = 58.8344 Brightest Pixel = 594.77 e Global Source Counts = 1, 749, 165.675 e ------------------------------------------------------------------------------------------------------------------------------------ 3 HD52698 STIS/NUV ACCUM 0.2X0.09 E230H 2713 1 1700 S -MAMA see below (1651 S) Comments: SNR = 46.1826 Brightest Pixel = 805.47 e ------------------------------------------------------------------------------------------------------------------------------------ 4 HD52698 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2722 S -MAMA see below (2602 S) Comments: SNR = 17.6863 Brightest Pixel = 162.89 e ------------------------------------------------------------------------------------------------------------------------------------ 5 HD52698 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2722 S -MAMA see below (2622 S) Comments: SNR = 17.6863 Brightest Pixel = 162.89 e ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD52698 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD52698 2 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 none none none none 1 N/A K HD52698 3 STIS/NUV ACCUM 0.2X0.09 E230H 2713 none none none none 1 1651.0 S -MAMA 17425( 3) - 11-Jun-2024 19:05:42 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD52698 4 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 2 2602.0 S -MAMA HD52698 5 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 3 2622.0 S -MAMA 17425( 3) - 11-Jun-2024 19:05:42 - [ 9] Visit: 03 Visit Requirements: BETWEEN 01-JUN-2023:00:00:00 AND 26-MAR-2024:00:00:00; BETWEEN 01-JUN-2024:00:00:00 AND 26-MAR-2025:00:00:00; BETWEEN 01-JUN-2025:00:00:00 AND 26-MAR-2026:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD57095 STIS/CCD ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.4 S (0.4 S) Comments: SNR = 152.3254 Brightest Pixel = 9, 499.47 e ------------------------------------------------------------------------------------------------------------------------------------ 2 HD57095 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 1 0.2 S (0.2 K S) Comments: SNR = 58.8344 Brightest Pixel = 594.77 e Global Source Counts = 1, 749, 165.675 e ------------------------------------------------------------------------------------------------------------------------------------ 3 HD57095 STIS/NUV ACCUM 0.2X0.09 E230H 2713 1 1819 S -MAMA see below (1681 S) Comments: SNR = 50.0030 Brightest Pixel = 943.84 e ------------------------------------------------------------------------------------------------------------------------------------ 4 HD57095 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2841 S -MAMA see below (2632 S) Comments: SNR = 18.9375 Brightest Pixel = 186.66 e ------------------------------------------------------------------------------------------------------------------------------------ 5 HD57095 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2841 S -MAMA see below (2652 S) Comments: SNR = 18.9375 Brightest Pixel = 186.66 e ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD57095 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD57095 2 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 none none none none 1 N/A K HD57095 3 STIS/NUV ACCUM 0.2X0.09 E230H 2713 none none none none 1 1681.0 S -MAMA 17425( 3) - 11-Jun-2024 19:05:42 - [ 10] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD57095 4 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 2 2632.0 S -MAMA HD57095 5 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 3 2652.0 S -MAMA 17425( 3) - 11-Jun-2024 19:05:42 - [ 11] Visit: 04 Visit Requirements: BETWEEN 24-FEB-2023:00:00:00 AND 25-DEC-2023:00:00:00; BETWEEN 24-FEB-2024:00:00:00 AND 25-DEC-2024:00:00:00; BETWEEN 24-FEB-2025:00:00:00 AND 25-DEC-2025:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD27274 STIS/CCD ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.7 S (0.7 S) Comments: SNR = 154.2964 Brightest Pixel = 9, 013.04 e ------------------------------------------------------------------------------------------------------------------------------------ 2 HD27274 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 1 0.2 S (0.2 K S) Comments: SNR = 28.5556 Brightest Pixel = 276.62 e Global Source Counts = 615, 814.596 e ------------------------------------------------------------------------------------------------------------------------------------ 3 HD27274 STIS/NUV ACCUM 0.2X0.09 E230H 2713 1 1877 S -MAMA see below (1695 S) Comments: SNR = 27.3049 Brightest Pixel = 300.06 e ------------------------------------------------------------------------------------------------------------------------------------ 4 HD27274 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2901 S -MAMA see below (2648 S) Comments: SNR = 18.3482 Brightest Pixel = 175.31 e ------------------------------------------------------------------------------------------------------------------------------------ 5 HD27274 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2901 S -MAMA see below (2668 S) Comments: SNR = 18.3482 Brightest Pixel = 175.31 e ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD27274 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD27274 2 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 none none none none 1 N/A K HD27274 3 STIS/NUV ACCUM 0.2X0.09 E230H 2713 none none none none 1 1695.0 S -MAMA 17425( 3) - 11-Jun-2024 19:05:42 - [ 12] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD27274 4 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 2 2648.0 S -MAMA HD27274 5 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 3 2668.0 S -MAMA 17425( 3) - 11-Jun-2024 19:05:42 - [ 13] Summary Form for Proposal 17425 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.09, 0.2X0.2, F25ND3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-JUN-2023:00:00:00 AND 26-MAR-2024:00:00:00, BETWEEN 01-JUN-2024:00:00:00 AND 26-MAR-2025:00:00:00, BETWEEN 01-JUN-2025:00:00:00 AND 26-MAR-2026:00:00:00, BETWEEN 17-JUN-2023:00:00:00 AND 04-FEB-2024:00:00:00, BETWEEN 17-JUN-2024:00:00:00 AND 04-FEB-2025:00:00:00, BETWEEN 17-JUN-2025:00:00:00 AND 04-FEB-2026:00:00:00, BETWEEN 19-JUL-2023:00:00:00 AND 04-MAR-2024:00:00:00, BETWEEN 19-JUL-2024:00:00:00 AND 04-MAR-2025:00:00:00, BETWEEN 19-JUL-2025:00:00:00 AND 04-MAR-2026:00:00:00, BETWEEN 24-FEB-2023:00:00:00 AND 25-DEC-2023:00:00:00, BETWEEN 24-FEB-2024:00:00:00 AND 25-DEC-2024:00:00:00, BETWEEN 24-FEB-2025:00:00:00 AND 25-DEC-2025:00:00:00 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140M, E230H, G430L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD27274, HD52698, HD57095, HD73752 ------------------------------------------------------------------------------------------------------------------------------------