It looks like the coords in (at least one of) the subtractions is off by almost 2 arcMINUTES.

From: Tony Spadafora (ALSpadafora@lbl.gov)
Date: Sun Apr 04 2004 - 00:00:20 PST

  • Next message: Robert A. Knop Jr.: "Re: It looks like the coords in (at least one of) the subtractions is off by almost 2 arcMINUTES."

    Rob,

    We seem to have discovered an almost 2 arcminute (not 2 arcsecond!)
    problem with the WCS coordinates for at least one of the subtractions
    (we don't yet know if the same problem exists for all of them).
    First, we looked for candidate acs04-022 on its reference image,
    acs02-03_2/jan032003acs3205sum.fts using ds9 and it does appear exactly
    at the coord that the subtraction says it should:
    Ra: 12:36:45.1 Dec: +62:15:35
        Then when you look for that location on the GOODS Sect 33 using ds9,
    you can easily make the visual match of the images, but you find the
    coords are all significantly different, so the candidate coord really
    is:
    Ra: 12:36:51.6 Dec: +62:13:47

    (Now we're checking the coords of the same visually-matched location on
    the Subaru I-band field with ds9, and we're getting something much
    closer to the GOODS Sect 33 coord, although about ~3 sec off in RA and
    ~7 arcsec off in Dec. However, in the Subaru i-band subtraction it
    matches the GOODS Sect33 coords exactly when you hand-select the
    candidate location. )

    We'll keep on hunting for the other candidates.

    Saul, Natalia, Vitaliy, Tony

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