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[vsolj-alert 498] V1494 Aql comparison (Granslo)



From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Sun Dec  5 08:02 JST 1999
Date: Sat, 04 Dec 1999 23:48:19 +0100
From: "Bjorn H. Granslo" <b.h.granslo@astro.uio.no>
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        biver@ifa.hawaii.edu, guy@tahq.demon.co.uk
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Subject: [vsnet-alert 3778] Sequence for V1494 Aquilae (Nova 1999)
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Norwegian Astronomical Society - Variable Star Section

***** Sequence for V1494 Aquilae (Nova 1999) *****

[Compiled by Bjorn H. Granslo, last update 1999 Dec 4]

Here follows a list of comparison stars for this bright nova,
discovered visually by Alfredo Pereira, Cabo da Roca, Portugal,
on 1999 Dec 1.785 UT.

---------------------------------------------------------------
1918+04     V1494 Aquilae (Nova Aql 1999 No. 2)
R.A. = 19h23m05s.4, Decl. = +04o57'20" (2000.0)
Type: NA?  Magnitude: 3.9 v - 16 R.  Spectrum: Pec(N)

ID  Star name       R.A. (2000.0) Decl.   V-mag   B-V   Sp  Ref
                    h  m   s     o  '  "
A   Zeta Aql       19 05 24.6  +13 51 48   2.99  +0.01  A0  HIP
B   Delta Aql      19 25 29.9  +03 06 53   3.36  +0.32  F0  HIP
C   Beta Aql       19 55 18.8  +06 24 24   3.71  +0.86  G8  HIP
D   Epsilon Aql    18 59 37.4  +15 04 06   4.02  +1.08  K0  HIP
E   Iota Aql       19 36 43.3  -01 17 12   4.36  -0.08  B5  HIP
F   Mu Aql         19 34 05.4  +07 22 44   4.45  +1.18  K3  HIP
G   Nu Aql         19 26 31.1  +00 20 19   4.64  +0.58  F2  HIP
H   19 Aql         19 08 59.9  +06 04 24   5.23  +0.35  F0  HIP
J   22 Aql         19 16 31.0  +04 50 05   5.59  +0.10  A3  HIP
K   45 Aql         19 40 43.3  -00 37 16   5.64  +0.12  A3  HIP
L   Upsilon Aql    19 45 40.0  +07 36 47   5.89  +0.18  A3  HIP
M   24 Aql         19 18 50.9  +00 20 20   6.40  +1.05  K0  HIP
1   HIP 95680      19 27 41.1  +04 42 35   6.73  +0.37  F0  HIP
2   HIP 95045      19 20 19.5  +04 46 40   7.04  +0.14  A2  HIP
3   HIP 95401      19 24 23.0  +05 33 52   7.77  +0.62  G0  HIP
4   HIP 95026      19 20 06.2  +04 28 50   7.93  +1.04  K0  HIP
5   TYC 0472-0641  19 21 21.8  +05 07 23   8.40  +0.21  ..  TYC
6   TYC 0473-5917  19 23 03.3  +04 36 52   8.66  +0.88  ..  TYC
7   TYC 0473-3097  19 23 33.6  +05 23 14   8.98  +0.37  ..  TYC
8   TYC 0473-5044  19 24 57.1  +04 10 39   9.19  +0.62  ..  TYC
9   TYC 0472-1241  19 21 54.1  +05 06 45   9.83  +0.56  ..  TYC
10  TYC 0473-3683  19 23 07.0  +05 06 14  10.11  +0.27  ..  TYC
---------------------------------------------------------------

The brighter comparison stars were selected by Guy M. Hurst,
and identifications (ID) of these stars are taken from TA
E-Circular No. 1475 (letters A-M); the fainter stars (numbers
1-10) were selected by undersigned. Positions, V magnitudes
B-V colours, and spectral types are from the Hipparcos (HIP)
or Tycho (TYC) catalogues. The accuracies of V and B-V are
generelly ranging from 0.01 mag. for the brighter stars to
0.05 mag. for the 10th magnitude objects. Some of the stars
in the table are possibly slightly variable, but this should
not affect visual observations.

It is important to point out that visual brightness estimates
differs more or less from V and other instrumental magnitudes.
This is mainly due to differences in spectral responses between
the eye and the defined magnitude system and the effects of the
atmosphere (visual observations are generelly not corrected for
extinction). Observations should therefore be reported in full.

                              Yours sincerely,
                              Bjorn H. Granslo
                             [Director, NAS.VSS]

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