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Standard Star Instructions » History » Version 11

Version 10 (Douglas Tucker, 08/29/2013 10:09 AM) → Version 11/124 (Douglas Tucker, 08/29/2013 10:10 AM)

h1. 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.)

h2. The Standard Fields



*SDSS Equatorial Fields: "Golden Standards"*
|_. Field |Field Name |_. | RA | _.Dec 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


h3. HST
CalSpec/Other Fields: "Silver Standards"* Standards"
|_. Field Name |_. RA |_. Dec |
|C26202/HST | 03:32:30 | -27:46:05 |
|MaxVis | 06:30:00 | -58:45:00 |

*Graham


h3. Graham
E-Region Fields (Southern u'g'r'i'z' fields): "Bronze Standards"* 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 |