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[vsnet-chat 2803] Re: V915 Sgr

Dear colleagues,

I am Seiichi Yoshida working on the MISAO Project.

Thanks, Dr. Morel, for refererring to MisV0562. Well, V915 Sgr was
also detected in the MISAO Project activities. There are five images
on three nights taken by KenIchi Kadota. Here are the photometry
measured using the USNO-A1.0 catalog.

1998 Jun 20.66727	<11.5C
1999 Jul 15.58797	8.9C
1999 Jul 15.58841	8.8C
1999 Sep 23.44072	10.1C
1999 Sep 23.44116	10.1C

Actually, this star is USNO-A1.0 0600.19443008 = IRAS 18383-2906. The
position of V915 Sgr in GCVS 4.1 is slightly different.

USNO-A1.0 0600.19443008   18 41 32.70  -29 04 02.3   9.9 R  12.5 B  (10.88V)
IRAS 18383-2906  R.A.=18 41 30.74  Decl.=-29 04 06.3  (22 x 7", p.a.=87)  flux(12)=5.15  flux(25)=2.32  flux(60)=<0.40  flux(100)=<1.48  98% variable
V915 SGR  R.A.=18 41 31.34  Decl.=-29 04 12.2  11.0 - <17 mag (P)  type:M  Epoch=33860  Period=281.8

The image of this star is available at:
  http://vsnet.aerith.net/pub/V915_Sgr.gif

It may be too bright, but we can see the variability of this star
between 1999 July and September on this image.

The image on 1998 June was taken with a wide field camera lens. A
red star sometimes becomes extremely diffused on an unfiltered CCD
image with a camera lens. So we cannot say which V915 Sgr was actually 
faint on that night, or it is very red.

Considering the Haseda's observations, it must not be one mag or more
fainter in 1998 June than in 1999 summer. Therefore, I think V915 Sgr
is a red star.

Here are the astrometry measured by the PIXY system from the images on 
1999 July and September.

  18 41 32.63 -29 04 03.8
  18 41 32.64 -29 04 04.3
  18 41 32.61 -29 04 03.7
  18 41 32.61 -29 04 03.9

The mean position is R.A. 18h41m32s.62, Decl. -29o04'03".9 (2000.0).

Best regards,

--
Seiichi Yoshida
comet@aerith.net
http://vsnet.aerith.net/

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