3-Gyro/F1G Hybrid Mode On-Orbit Test
Abstract
The program contains the additional observations for the 3-Gyro/F1G Hybrid Mode On-Orbit Test that could not be obtained using the current calibration or science programs.
STIS: CAL/STIS STIS Coronagraphic Monitor - Hybrid Mode By observing the star Tau Ceti with BAR5, we will investigate the time variability in coronagraphic performance using Program 14426 as a baseline. Recent work with the STIS coronagraph shows that its performance can be deterministically calculated including systematic noise terms from speckle noise. However, it can be difficult to assess performance over time given the diversity of observing strategies currently used for the STIS coronagraphic locations and the recent large increase in spacecraft jitter. This monitor program will be used to assess whether any degradation in performance is measured due to jitter compared to previous observations of this star taken in 2015 as well as to determine whether this program should be repeated. This is essentially a repeat of PID 15603 to be executed during the HST Hybrid Mode On-Orbit Test in June 2020. WFC3 + ACS: Hybrid-mode and CTE testing with Omega Centauri observations This program will serve a dual purpose. Its main purpose will be to evaluate the pointing quality of hybrid-mode by allowing us to compare the achieved Point-Spread FUnctions (PSFs) with nominal PSFs. In addition, the observations will allow us to evaluate the empirical impact of imperfect charge-transfer efficiency (CTE) on star images with background levels between 12e and 30e. The selected field in Omega Cen will have a large number of stars. The short exposures should have few bright stars but a great many faint stars (which will be affected by CTE blurring). In the deep exposures, these faint stars will have a lot of signal, so we can know exactly how they should look, pixel-by-pixel in the short exposures. By comparing the star profiles in the short exposures with the "truth" from the long exposures, we can demonstrate to users directly how imperfect charge transfer impacts science. FGS: POS and Trans mode astrometry Copy of visit 4 from PID 15605. Performes POS and Trans mode astrometry on the calibration target Upgren 69 using FGS1R as the astrometer.- Publication:
-
HST Proposal
- Pub Date:
- May 2020
- Bibcode:
- 2020hst..prop16117R