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[vsnet-chat 4813] AS270 sequence
- Date: Thu, 6 Sep 2001 10:11:08 +1000
- To: <vsnet-chat@kusastro.kyoto-u.ac.jp>, <vsnet-sequence@kusastro.kyoto-u.ac.jp>
- From: "Bruce Sumner" <b.sumner@bom.gov.au>
- Subject: [vsnet-chat 4813] AS270 sequence
- Cc: <aah@nofs.navy.mil>
- Importance: Normal
- In-Reply-To: <200109041849.AA02952@runner.nofs.navy.mil>
- Reply-To: <b.sumner@bom.gov.au>
- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
I have made a single night sequence for this symbiotic
variable from Arne's recent field photometry. As Arne
mentioned the zeropoint error will be in the 0.02mag
range.
Bruce
-------------------------
231 AS270 (SAGITTARII) (ZAND) Range: 11.5-
Position: 18 05 22.73 -20 20 38.1 (J2000, from .dat file)
Magnitude: V=11.544 B-V=1.103 (from .dat file)
ID RA (2000) DEC X Y N V ERR B-V ERR
a) Comparison star sequence
1 18 05 57.3 -20 16 27 333 251 1 11.419 1.435
2 18 05 39.9 -20 24 45 87 -247 1 12.264 1.511
3 18 05 15.4 -20 23 03 -257 -145 1 12.549 0.778
4 18 05 28.9 -20 21 39 -68 -61 1 13.147 1.402
5 18 05 46.0 -20 25 57 172 -319 1 13.413 0.770
6 18 05 44.2 -20 24 02 147 -204 1 13.915 0.790
7 18 05 39.8 -20 17 30 86 188 1 14.237 0.752
8 18 05 36.4 -20 21 02 37 -24 1 14.393 0.779
9 18 05 44.6 -20 21 25 154 -47 1 14.639 0.680
10 18 05 18.1 -20 24 17 -220 -219 1 14.963 1.085
11 18 05 35.3 -20 19 30 22 69 1 15.308 1.053
12 18 05 26.2 -20 19 50 -106 48 1 15.926 1.145
b) Wide-colour extension for CCD calibration
18 05 13.0 -20 19 00 -292 98 1 13.191 0.455
18 05 24.2 -20 24 22 -134 -224 1 13.424 2.019
18 05 54.8 -20 16 27 297 251 1 12.187 2.715
Notes:
1. This single night sequence is expected to have errors of about
+/-0.02 mag.
2. Most of the bright stars in this field are quite red, which explains
why the brighter sequence stars are redder than I would normally choose.
Bruce Sumner
6 September 2001
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