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Standard Star Instructions » History » Version 13

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Douglas Tucker, 08/29/2013 10:14 AM


Standard Star Instructions

  • Standard star fields are to be observed every evening and morning twilight that appear to be clear,
    where "clear" is determined by a quick visual inspection of the RASICAM image, of the TASCA image, or
    (!) of the sky itself.
  • If possible, for each twilight period, 3 standard star fields should be observed: one at low airmass
    (X<1.25), on at medium airmass (X=1.25-1.65), and one at high airmass (X=1.65-2.10). It is generally
    better to observe the high-airmass field first, since its airmass will be changing the most rapidly.
  • For half-nights, 1 or 2 fields -- preferably a low-airmass field and a high-airmass field -- should be
    observed just before switchover. (If only one field, a high-airmass field is preferred.)
  • For evening twilight, use the DES/standard/Yzirg scripts (which start with Y-band and end with g-band);
    for morning twilight or pre-switchover, use the DES/standard/grizY scripts (which start with g-band and
    end with Y-band). (For those rare nights when we also observe in u-band, please use the corresponding
    "DES/standard/Yzirgu" and "DES/standard/ugrizY" scripts.)

The Standard Fields

SDSS Equatorial Fields: "Golden Standards"
Field Name RA _.Dec
SDSSJ0000-0000 00:00:00 +00:00:00
SDSSJ0100-0000 01:00:00 +00:00:00
SDSSJ0200-0000 02:00:00 +00:00:00
SDSSJ0320-0000 03:20:00 +00:00:00
SDSSJ0843-0000 08:43:00 +00:00:00
SDSSJ0933-0005 09:33:00 -00:05:00
SDSSJ0958-0010 09:58:00 -00:10:00
SDSSJ1048-0000 10:48:00 +00:00:00
SDSSJ1227-0000 12:27:00 +00:00:00
SDSSJ1442-0005 14:42:00 -00:05:00
SDSSJ2140-0000 21:40:00 +00:00:00
SDSSJ2300-0000 23:00:00 +00:00:00
HST CalSpec/Other Fields: "Silver Standards"
Field Name RA Dec
C26202/HST 03:32:30 -27:46:05
MaxVis 06:30:00 -58:45:00
Graham E-Region Fields (Southern u'g'r'i'z' fields): "Bronze Standards"
Field Name RA Dec
E1-A 01:24:50 -44:33:40
E2-A 04:03:00 -44:41:45
E3-A 06:42:54 -45:05:06
E4-A 09:23:44 -45:21:02
E5-A 12:04:11 -45:24:03
E6-A 14:45:33 -45:15:34
E8-A 20:07:22 -44:37:01
E9-A 22:45:37 -44:22:47