HST

1
HST NGST Operations

• Brian McLean
• 22nd October 2001

2
HST Operations

• Bright object protection
• STIS (SM-2) uses MAMA detectors which are UV
  sensitive
• cannot have a blue star in STIS aperture for ANY
  HST pointing
• Also ACS (SM-3b) and COS (SM-4)
• GSC-II and DSS-II is integrated into APT
  (Astronomers Proposal Tool)

3
HST Operations

• Updated Positions
• proper motions of guide stars starting to affect
  target acquisitions for smaller apertures
• Proposed switch from GSC-I to GSC-II in cycle 12
• More recent epoch and availability of proper
  motions
• System-wide implications
• Coordination of GO Phase 2, scheduling, execution
• WCS issues
• DSS headers (with GSC-II astrometry)
• Requires proposed enhanced WCS in FITS standard
• Backward compatibility with image tools
• IRAF/MIDAS/SAOimage/IDL

4
NGST Operations Concept

• Guide Star Availability Study (Spanga)
• GSC-II has sufficient GS density in IR
• 95 probability, 4x4 FOV, Klt17
• 2MASS has IR colours
• Integrate GSC-II 2MASS for NGST operations
• Canadian Space Agency selected for Guider work
  package
• Options use section of primary IR detector or
  provide separate instrument.