From rgm@ast.cam.ac.uk Wed Sep 25 15:01:19 2002 Date: Wed, 25 Sep 2002 14:37:55 +0100 (BST) From: richard mcmahon at IOA To: Weimin Yuan , Jonathan Tedds , Mike Watson Subject: Almanac Info for Dates of UKIRT run; Subaru/XMM field? Dates: 19,20 Oct Almanac for Mauna Kea, Hawaii: long. 10 21 53 (h.m.s) W, lat. 19 49.6 (d.m), elev. 4215 m Hawaiian Standard Time ( 10 hrs W) in use all year. For the night of: Sat, 2002 Oct 19 ---> Sun, 2002 Oct 20 Local midnight = 2002 Oct 20, 10 hr UT, or JD 2452567.917 Local Mean Sidereal Time at midnight = 1 32 53.8 Sunset ( 4215 m horizon): 18 04 HST; Sunrise: 6 09 HST Evening twilight: 19 09 HST; LMST at evening twilight: 20 41 Morning twilight: 5 05 HST; LMST at morning twilight: 6 38 12-degr twilight: 18 43 HST --> 5 30 HST; night center: 0 07 HST Moonrise: 17 15 HST Moonset : 6 01 HST Moon at civil midnight: illuminated fraction 0.991 0.9 days until full moon, RA and dec: 1 09 16, 2 43.9 The sun is down for 12.1 hr; 9.9 hr from eve->morn 18 deg twilight. Bright all night (moon up from evening to morning twilight). So we have around 10.5hrs of obseving time per night since we can start before Twilight. The primary RA range: 21 to 6hrs Possible to observe range: 18 to 9hrs Moon Problem: The moon is at FULL at at RA, Dec 0109+0244 on 19th 0153+0750 on 20th This means fields within 15degrees of the moon could be a problem especially if there is cirrus. At K it might be a small effect but the autoguider works in the optical I think. If we observe each target for 15mins in K, we can probably observer 3 targets per hours so potentially we could observe 60 targets. If the moon is not a problem we could observe a 'complete' sample of sources in the SDF. -------------------------------------------------------------------------- Dr. Richard G. McMahon | Phone (office) 44-(0)-1223-337519 University of Cambridge | (switchboard) 1223-337548 Institute of Astronomy | (secretary) 1223-337516 Madingley Rd | FAX 1223-337523 Cambridge, CB3 OHA, UK. | mobile (0)-7885-409019 office: Hoyle 8 | home 1223-464920 --------------------------------------------------------------------------- email: rgm@ast.cam.ac.uk | WWW: http://www.ast.cam.ac.uk/~rgm ---------------------------------------------------------------------------