[vsnet-chat 1906] Comparison stars for Nova Vel 1999

["Bjorn H. Granslo" <b.h.granslo@astro.uio.no>]

Norwegian Astronomical Society - Variable Star Section

          ***** Comparison stars for Nova Velorum 1999 *****

I have prepared a list of bright comparison stars for Nova Vel 1999.
This list, given below, contains star names, positions, V magnitudes,
B-V colours, angular distances from the nova, and suggested
identifications of the comparison stars.

Positions and photometric data are taken from The Hipparcos Catalogue
(ESA 1997). Star names with Greek and Roman letters are due to Lacaille
(ref. Werner and Schmeidler, 1986: Synopsis of the Nomenclature of the
Fixed Stars), others are HR numbers from Yale Bright Star Catalogue,
5th edition (Hoffleit et al., 1991). A number of the stars are slightly
variable, but they should be OK for visual observations.

I have selected stars within 20 degrees from the nova, with B-V < 1.25,
and to a limiting magnitude from below 5.0 (near the nova) to 2.5 (at
distance 20 degrees).

     Name     R.A. (2000.0) Decl.   V-mag    B-V    Dist  Id
              h  m   s     o  '  "                    o
  Alpha Cru  12 26 35.9  -63 05 57   0.77   -0.24   17.1
   Beta Cru  12 47 43.3  -59 41 19   1.25v  -0.24   18.4
  Delta Vel  08 44 42.2  -54 42 31   1.93   +0.04   17.8
  Gamma Cen  12 41 31.2  -48 57 36   2.20   -0.02   18.7   AA
   Iota Car  09 17 05.4  -59 16 31   2.21   +0.19   14.0

  Kappa Vel  09 22 06.8  -55 00 38   2.47v  -0.14   12.5
     Mu Vel  10 46 46.1  -49 25 12   2.69   +0.90    3.0   A
  Theta Car  10 42 57.4  -64 23 40   2.74v  -0.22   12.0
  Delta Cru  12 15 08.8  -58 44 56   2.79v  -0.24   14.2
Upsilon Car  09 47 06.1  -65 04 19   2.92   +0.27   14.6

 Lambda Cen  11 35 46.9  -63 01 11   3.11v  -0.04   12.5
      a Car  09 10 58.1  -58 58 01   3.43v  -0.19   14.6
    Phi Vel  09 56 51.8  -54 34 04   3.52v  -0.07    7.4   B
      u Car  10 53 29.6  -58 51 12   3.78   +0.94    6.5   C
      s Car  10 27 52.8  -58 44 22   3.81   +0.32    6.7   D

      p Vel  10 37 18.3  -48 13 32   3.84   +0.30    4.4   E
      q Vel  10 14 44.3  -42 07 19   3.85   +0.05   11.5
     Pi Cen  11 21 00.4  -54 29 28   3.90   -0.16    5.8
      h Car  09 34 26.7  -59 13 47   4.08   -0.01   11.9
    HR 4180  10 39 18.4  -55 36 12   4.29   +1.02    3.3   F

    HR 4074  10 20 54.8  -56 02 36   4.50   -0.10    5.0
      A Cen  11 34 44.7  -54 15 51   4.62   -0.08    7.7
      P Car  10 27 24.5  -57 38 20   4.65v  +0.47    5.8   G
    HR 4134  10 31 22.2  -53 42 58   4.89   +0.50    2.4   H
    HR 4221  10 46 57.5  -56 45 26   5.14   -0.08    4.3   K

According to G. J. Garradd [vsnet-alert 3027], the precise position
of the nova is R.A. = 10h44m48s.39, Decl.= -52o25'30".7 (2000.0).

                                 Yours sincerely,
                                 Bjorn H. Granslo

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