[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]
[vsnet-campaign 509] V452 Cas revised sequence
Re: [vsnet-campaign 507] V452 Cas outburst
The comment regarding care in separating the variable from its close
(7") companion (15.8V) should be well noted during the current
outburst. To assist observers during this outburst here is a revised
sequence. See note 3 in particular.
Regards,
Bruce Sumner
--------------------------------------------------------------------
159 V452 CASSIOPEIAE (UGSU) Range: 14.7-18.8V
Position: 00 52 18.03 +53 51 49.9 (J2000, Henden astrometry)
Magnitude: V=18.81 B-V=0.28 (Henden, psf-fitting)
ID RA (2000) DEC X Y N V ERR B-V ERR
a) Comparison star sequence
1 00 52 04.9 +53 50 59 -116 -51 3 12.078 0.102 0.672 0.029
2 00 52 21.6 +53 52 31 32 41 2 12.450 0.028 0.133 0.066
3 00 52 19.6 +53 48 15 15 -215 2 12.694 0.071 1.096 0.069
4 00 52 51.5 +53 50 55 296 -55 2 13.347 0.006 0.468 0.004
5 00 52 20.6 +53 50 56 23 -55 2 13.646 0.021 1.253 0.036
6 00 52 41.5 +53 49 05 208 -165 2 14.160 0.010 0.354 0.002
7 00 52 07.7 +53 49 26 -91 -144 2 14.434 0.000 0.772 0.004
8 00 52 33.0 +53 50 25 132 -85 2 14.583 0.006 0.625 0.006
9 00 52 04.7 +53 50 26 -118 -84 2 14.998 0.015 0.825 0.003
10 00 52 26.9 +53 52 43 79 53 2 15.419 0.012 0.632 0.005
11 00 52 14.7 +53 52 03 -29 12 2 15.585 0.012 0.679 0.001
12 00 52 18.3 +53 51 44 3 -7 2 15.798 0.006 1.323 0.010
13 00 52 20.5 +53 51 48 22 -2 2 16.587 0.025 0.641 0.018
14 00 52 18.5 +53 52 04 4 14 2 17.195 0.014 0.854 0.000
15 00 52 15.1 +53 51 46 -25 -4 2 17.726 0.011 0.818 0.020
16 00 52 19.4 +53 51 19 12 -32 2 18.861 0.021 0.631 0.049
b) Wide-colour extension for CCD calibration
00 52 02.9 +53 56 24 -134 274 2 12.189 0.062 0.178 0.011
00 52 50.8 +53 48 02 290 -228 2 14.665 0.035 1.537 0.028
00 52 57.2 +53 58 02 346 372 2 13.724 0.012 1.542 0.003
Notes:
1. Stars 1, 2 and 3 are saturated and they should be used for
guidance only until accurate magnitudes are determined.
2. There is a bright star located only 100 arcsec south of V452 Cas
that has reliable Tycho-2 photometry: V=9.66 +/-0.02. Additionally
there are at least four other bright stars in this field.
3. There is a red companion to V452 Cas, star #12 in this sequence,
which in the past has been incorrectly identified as the variable.
The real V452 Cas is 7 arcsec NNW of this 15.8V red star and is about
3 magnitudes fainter at minimum. Take care to correctly identify the
variable as the fainter northern component of this double when the
variable is at minimum.
Bruce Sumner
31 July 2000
Revised 20 September 2000
vsnet-adm@kusastro.kyoto-u.ac.jp
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page