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CCD Photometry: Planning

This guide provides a detailed overview of planning for CCD photometry observations. Key considerations include determining magnitude, depth, air mass, and twilight conditions; utilizing ephemeris to locate the Moon; and planning for data storage and archiving. It emphasizes the importance of choosing appropriate filters, particularly the V filter for initial projects, and setting up finder charts to identify stars and their companions. Tips for achieving accurate timing, acquiring sky flats, and logging data are also included, ensuring successful observation sessions.

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CCD Photometry: Planning

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  1. CCD Photometry: Planning Planner/events: magnitude, depth, air mass, twilight Weather: check the web; what can you work through? Twilight considerations: darkness and flats; ephemeris. Where is the Moon? Plan for data storage/archiving Choose filters (for first project, just the V)

  2. Finder charts • Finder charts: comparison stars, offsets, duplicity of markings (GCVS); companions, orientation.

  3. Setting up • Get there early! • Astronomical twilight: sun at –18O alt. • Set clock/watch to one-sec accuracy -not precision [9-1-202-762-1401 or on Internet, soon]

  4. Acquiring Sky Flats Why? [Mira samples] , instrument undisturbed Good field [finding] clear? Chase twilight until not saturated (<65535) Odd number. Got stars? [dither] darks [same/long], bias

  5. Data Images take enough images of ingress and egress name as hhmmss (example 022341) = UT Dark every 15-20 minutes; two at start and end (same duration as data exposures) Keep field registered (drift=problems later) Keep a data log using forms provided

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