[vsnet-alert 8628] Re: [baavss-alert] New object near M27

[David Boyd]

Hello,

CCD photometry at West Challow Observatory, UK, using a 0.35m SCT and SXV-H9 CCD 
with V and I filters gave the following mean transformed magnitudes and standard 
errors for the reported object.

2005 Aug 21.916   V=16.17 +/- 0.01
2005 Aug 21.917   I=16.00 +/- 0.04

Ensemble of 5 stars from Arne Henden's M27 photometry file used as comparison.

Astrometry using Astrometrica and USNO B1.0 gave
19 59 51.283 (+/-0.28)   +22 42 32.13 (+/-0.29)

Regards,
David Boyd



----- Original Message ----- 
From: "Wolfgang Renz" <w_renz at onlinehome.de>
To: "AAVSO-DIS" <aavso-discussion at mira.aavso.org>; "BAA-VSS Alert (yahoo)" 
<baavss-alert at yahoogroups.com>; "cvnet-discussion" 
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"vsnet-alert (mailing list)" <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>
Sent: Sunday, August 21, 2005 11:04 PM
Subject: [baavss-alert] New object near M27


Hello

Jörg Hanisch made a test image of M27 (16 x 20 sec) with his
C11 at 2699 mm FL and a unfiltered SXV-H9 camera at 3x3
binning in the night of 2005-08-17/18. When he blinked his
image with some images on the net, he found a new object at
the location:
RAJ2000: 19:59:51.29
DEJ2000: +22:42:32.3
CCD clear: 15.8 (+-0.4mag)

There is a faint USNO-B1.0 star near that locaion:
RAJ2000: 19:59:51.04
DEJ2000: +22:42:35.4
R2 mag : 17.31

The closest star Arne Henden has in his photometry files is:
RAJ2000: 19:59:51.15
DEJ2000: +22:42:30.6
V mag  : 19.378
(B-V)  :  1.246

But there is no bright, very red star present in the DSS2 infrared
or 2MASS J, H and Ks images at that location that could be
the reason for the bright CCD clear measurement. So its at
least an object thats a couple of mags brighter than usual.

Thorsten Lange used the Minor-Planet Checker at the IAU website
and didn't find any asteroids within 15' at 2005-08-18 00:00 UT.

Its not Goldilocks' Variable (19h59m29.8s, +22°45'13''), that is
located at the opposite side of M27:
http://www.obspm.fr/messier/xtra/leos/gl.html

Hans-Göran Lindberg also reported his new object today:
http://sabbe.fragzone.se/KPO/05081827.htm
(image made 2005-08-18 21:45 – 21:57 UT)

I've found an other image made by Dominik Wos (2005-08-18/19)
that also shows something brighter than usual at that position:
http://www.astrofotografia.zone.pl/eng/dso/m27_19082005.html

Clear skies
  Wolfgang Renz

-- 
Wolfgang Renz, Karlsruhe, Germany
Rz.BAV = WRe.vsnet = RWG.AAVSO