[vsnet-chat 2809] On HadV48 = GSC 6870.614 (Greaves)

[Taichi Kato <tkato>]

On HadV48 = GSC 6870.614 (Greaves)

Date: Wed, 12 Apr 2000 12:26:08 +0000
From: JG <jgts@jgws.totalserve.co.uk>
Subject: TYC2/GSC 6870 00614 1

The following [fairly] random date sampling, though somewhat bitty and
based on a very mixed bag of catalogues not known for accurate
magnitudes (and having slightly dissimilar passbands), suggests that
TYC2/GSC 6870 00614 1 is normally at 'maximum' rather than in 'fade', as
would be fitting for an RCB star or some type of eclipsing object.

Possibly owners of the new UCAC1 CD can provide a value for a more
recent epoch?

ac2000           epoch = 1913.6    BT mag = 11.7
usno a1.0       epoch = 1954.7  blue mag = 12.3
usno a2.0        10 Aug 1974     blue mag = 11.6
usno a2.0        18 Aug 1979     red  mag = 11.1
gsc [serc-v]     18 May 1987    gsc  mag = 11.6 +/- 0.4
Tycho2 mean epoch = 1991.3    BT mag = 12.8 +/- 0.3

Cheers

John

John Greaves
UK

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