Five Busy Months for FGS

1. Five Busy Months for FGS STScI/TIPS 01/15/09 Ed Nelan

3. FGS Timeline, Sept 08 - Jan 09 • Sept 15: NSSC-I FSW upgrade to support SM4 (WFC3 & COS) • During reboot process, FGS1r is only SI available for scheduling (~2 days)

6. FGS Timeline, Sept 08 - Jan 09 • Sept 15: NSSC-I FSW upgrade to support SM4 (WFC3 & COS) • During reboot process, FGS1r is only SI available for scheduling (~2 days) • Sept 15: JSC closed for the week due to Hurricane Ike. • Rumors warn that SM4 may slip due to Ike • Sept 24: NASA announces SM4 launch is Oct 14 • Sept 24: STScI SMO request PIs of WFPC2 and FGS snaps to swap-in ~50 targets that are observable in the October time frame in the event that SM4 is delayed further. (LRP is depleted of WFC2 GO visits)

7. FGS Timeline, Sept 08 - Jan 09 • Sept 15: NSSC-I FSW upgrade to support SM4 (WFC3 & COS) • During reboot process, FGS1r is only SI available for scheduling (~2 days) • Sept 15: JSC closed for the week due to Hurricane Ike. • Rumors warn that SM4 may slip due to Ike • Sept 24: NASA announces SM4 launch is Oct 14 • Sept 24: STScI SMO request PIs of WFPC2 and FGS snaps to swap-in ~50 targets that are observable in the October time frame in the event that SM4 is delayed further. (LRP is depleted of WFC2 GO visits) • Sept 28: Revised FGS Snap proposal 11212 submitted • Sept 28: HST safes, CU/SDF side-A fails, FGS1r continues to observe • Sept 30: NASA postpones SM4.

8. FGS Timeline, Sept 08 - Jan 09 • Oct 9: (Friday) SMO requests an additional 50 FGS targets to populate the October 19 SMS (11212 nearly deleted) • Tony Roman: “if you get it to us by early Tuesday, we’ll make it happen” • all visits used up in ~10 days (Oct 20-30)

9. FGS Timeline, Sept 08 - Jan 09 • Oct 9: (Friday) SMO requests an additional 50 FGS targets to populate the October 19 SMS (11212 nearly deleted) • Tony Roman: “if you get it to us by early Tuesday, we’ll make it happen” • all visits used up in ~10 days (Oct 20-30) • Oct 15: NSSC-I switch to side-B • Oct 16: side-B fails

10. FGS Timeline, Sept 08 - Jan 09 • Oct 9: (Friday) SMO requests an additional 50 FGS targets to populate the October 19 SMS (11212 nearly deleted) • Tony Roman: “if you get it to us by early Tuesday, we’ll make it happen” • all visits used up in ~10 days (Oct 20-30) • Oct 15: NSSC-I switch to side-B • Oct 16: side-B fails • Oct 17: SMO requests FGS proposals from UTx and GSU to fill near-term LRP. Suggested size is “50 - 60 orbits”. • Oct 24: Phase1 & 2 proposals submitted. • UTx proposal has 50 orbits • GSU proposal has 300 orbits (11943 & 11944)

11. FGS Timeline, Sept 08 - Jan 09 • Oct 23: Gilliland et al. request 175 FGS orbits to collect one trillion photons from HD 17156. Observations to execute: • Transit events: Nov 6 & 7, Dec 19 • Asteroseismology: Dec 21- Jan 2 (ten-day campaign)

12. FGS Timeline, Sept 08 - Jan 09 • Oct 23: Gilliland et al. request 175 FGS orbits to collect one trillion photons from HD 17156. Observations to execute: • Transit events: Nov 6 & 7, Dec 19 • Asteroseismology: Dec 21- Jan 2 (ten-day campaign) • Oct 24: Gilliland proposal accepted • Ron: “Yikes, now we have to do something fast!” • Phase2: extreme orbit crafting by Merle Reinhart (thanks Merle!) • Oct 29: NSSC-I up and operating on side-B • Nov 25: Request to re-optimize FGS1r S-curves via AMA submitted to HSTMO and GSFC HST Project. • Approved week of 12/01, to execute Jan 23.

13. FGS Timeline, Sept 08 - Jan 09 • Nov 30: Phase 2 Proposal “Calibrating FGS1r OFAD, Second Epoch” submitted. 18 orbits. • Needed to execute before December 23 (M35 unavailable afterward), and before FGS1r AMA re-optimization • Executed successfully, Dec 12 - 20.

14. FGS1r OFAD, December 2008

15. FGS Timeline, Sept 08 - Jan 09 • All along, various Cycle 16 & 17 GO FGS proposals have been executing as needed (primarily parallax and exoplanet measurements). Approximate number of FGS science orbits in last 5 months: 720

16. FGS Science • The additional FGS visits solicited by STScI from UTx and GSU had two prime constraints: • Targets schedulable in two-gyro mode in the Dec to March time frame • No long term projects being initiated • UTx proposal used FGS1r in POS mode to revisit star field that had been observed in the past for positional astrometry (parallaxes) • Some targets hadn’t been observed for years • Some targets had only been observed with FGS3 (not FGS1r) • Late epoch visits will provide extremely accurate proper motion measurements, which in turn improve parallax (and reflex motion measurement if applicable). • Observations generally succeeded. Guide star acquisition failures affected one target at a particular Orient.

17. FGS Science • GSU proposals used FGS1r in TRANS mode survey targets for binarity, or to observe known binaries to update orbital elements. • Targets initially were all high mass stars • Proposal 11212 “Filling the Period Gap for Massive Binaries” (PI Gies). • Binary “hit rate” appears to be approximately 30-40%

18. Proposal 11212 FGS1r detection of 0.5” binary spectral type B1.5III

19. FGS Science • GSU proposals used FGS1r in TRANS mode survey targets for binarity, or to observe known binaries to update orbital elements. • Targets initially were all high mass stars • Proposal 11212 “Filling the Period Gap for Massive Binaries” (PI Gies). • Binary “hit rate” appears to be approximately 30-40% • Targets in first supplement (proposal 11901) were positive binary detections from 11212 that could schedule in October - December. • 47 targets • 2nd proposal “Binaries at the Extremes of the H-R Diagram” • Targets include: high mass stars, LBVs, nearby low mass main sequence stars, cool subdwarfs, and white dwarfs. • Split into two phase2 proposals (11943 & 11944) because APT can’t handle proposals with more than ~130 visits.

20. Proposal 11944 FGS1r measurement of DD G107-70 orbit 1996 2008

21. FGS Science Gilliland proposal 11945: • “Asteroseismology of Extrasolar Planet Host Stars” • used FGS2 in POS mode to collect high S/N photometry of HD 17156 • goal: to collect one trillion photons to search for 10-15 of the highest amplitude stellar oscillations. • may result in knowledge of the stellar density (~1%) and age (5%). • HD 17156 hosts a transiting planet. Transit light curve also provides stellar density to ~1%, a good independent check on the asteroseismology. • Using FGS for this project required calibration of the FGS2 dark counts and the 4 PMT deadtime constants. • HST project had mild concerns about the PMT life time issues. Target HD 15176 is a V=8.1 star, near the V=8 OLD restriction. • Pre & post checks on Upgren69 were included to verify PMT health.

22. FGS2r S-curves, before & after 10 day campaign Upgren69 FGS2r PMT counts decreased by ~0.2%

23. HD 17156 November Transit, version 1

24. HD 17156 November Transit version2

25. FGS1r AMA Adjustment

26. FGS1r AMA Adjustment

27. FGS1r AMA Adjustment • Scheduled for week of Jan 19 • Prerequisites: • Determination of AMA move (Goodyear) based upon recently obtained FGS1r S-curves (from large science programs 11212, 11943, 11944) • FGS1r OFAD re-calibration (proposal 11870), Dec 12 - 20, 2009 • Preparation of phase2 (11963) proposal to verify OFAD across AMA move, and to provide data to update FGS1r-FGS alignment. • Uses astrometric field in NGC 5617 • Identification of post-AMA move target star to verify FGS1r S-curves are optimal (proposal 11964). • Verify FGS1r POS mode acquisition after AMA move (11964)

28. FGS1r-FGS Alignment NGC 5617

29. FGS1r-FGS Alignment NGC 5617

30. Post AMA-adjustment verification star, HD 233877 • Standard FGS calibration star known to be single (point source) • Well isolated, tolerant of FGS1r-FGS alignment errors.