[vsnet-chat 2730] (fwd) HadV46 USNO colour

[Taichi Kato <tkato>]

Date: Sun, 12 Mar 2000 11:40:09 +0000
From: JG <jgts@jgws.totalserve.co.uk>
Subject: HadV46 USNO colour

Dear Taicho Kato

First I not that this object appears to lie on the edge of a Lynd dark
nebula, which is itself amongst a sea of other such nebu which I
suppose should have made it appear even redder!

The A type star HIP 90991, a mag 5.7 star, lies quite close and if you
can plot the USNO stars in this region as a half degree square of
objects coded in 'b-r' by 'colour', and centred on HadV46's position,
you'll note a strange vertical 'blue streak' amidst a 'sea of yellow'
ascending from this HIP star [a bit generalised].  Although there is
nothing to stop all these stars being blue here, at certain resolutions
it looks like a drop of liquid that has run!  HadV46's position lies
just east of this 'blue streak'.

I'm quoting for object USNO0750.13595197 using version 1.3 of Arne
Henden's freeware DOS search program on USNO A2.0 data [end figure RA =
4.049s, end figure Dec 00.23"], so I suppose you're quoting A1.0?

Yours

John

John Greaves
UK

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