[vsnet-chat 533] Re: V4074 Sgr

[Mati Morel <morel@ozemail.com.au>]

Hi everyone,
I thoroughly investigated the position of V4074 Sgr a few years ago, and
these are my conclusions.

1.  There are indeed two emission line objects in the vicinity. V4074 Sgr
has been known as H-alpha emission line object since 1950. It is 3" due 
south of a 12th magnitude, normal K0 III star.
    The other object is HD 167362, a planetary nebula.
Positions (1950): 
V4074 Sgr : 18h12m51.9s -30d52'16"
HD 167362 : 18 12 55    -30 53 10.

D.A. Allen and Duerbeck agree with their published coordinates, and are
both, to all intents and purposes, correct.

Finder Charts:
Duerbeck's chart is correct, but is hard to follow.
Allen's chart is wrong. He points to HD 167362, while V4074 Sgr is in fact
8.5mm W, 7mm N of the indicated position. His chart is easier on the eye.

Examining Allen's chart under magnification, the images of V4074 Sgr and
HD 167362 are very similar, which is no doubt the reason his chart is
wrongly marked. 

Regards,
Mati Morel

Refs: 
Duerbeck, H.W.: Space Science Reviews, 45/1+2 (1987)
Allen, D.A. : Proc. ASA 5(3),369-385 (1984)

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MOREL ASTROGRAPHICS
Stellar Data & Information Centre
c/o M. Morel
6 Blakewell Road,
Thornton NSW 2322
AUSTRALIA
e-mail: morel@ozemail.com.au
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