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[vsnet-lpv 2] NSV24062
NSV24062
The following object in question has faded, supportoing the Mira-type
classification.
From: Seiichi Yoshida <comet@aerith.net>
Date: Wed, 29 Mar 2000 06:18:29 -0600
Subject: [vsnet-alert 4493] Recovery of NSV 24062
Dear colleagues,
I am Seiichi Yoshida working on the MISAO Project.
Seiichi Yoshida and KenIchi Kadota recovered a possible symbiotic star
discovered by Yukio Sakurai in 1994 (cf. IAUC 6051), NSV 24062. Here
is the report. Everything is made clear by public discussion on the
VSOLJ (Variable Star Observers' League in Japan) mailing list. Thanks
so much for the contributors.
In the course of variable star survey based on the MISAO Project
observations, Seiichi Yoshida discovered a variable star at
R.A. 17h59m39s.58, Decl. -25o13'30".0 (2000.0) with a range of 10.8 -
12.4 mag from unfiltered CCD variable star survey images taken by
Kadota between 1999 April and 2000 February, being supported by the
semi-automated variable star detection by a software, the PIXY
system. Here is the photometry:
1999 Apr 8.75186 11.4C
1999 Apr 8.75242 11.4C
1999 Apr 30.74588 10.8C
1999 Apr 30.74631 10.9C
1999 Sep 23.42939 11.6C
1999 Sep 23.42981 11.5C
2000 Feb 24.83137 12.4C
The position and magnitude are measured with USNO-A1.0 catalog.
Taichi Kato pointed out that this object is probably identified with
NSV 24062, a possible symbiotic star discovered by Yukio Sakurai in
1994 (cf. IAUC 6051). The position of NSV 24062 is R.A. 17h56m35s.54,
Decl. -25o13'15".7 (1950.0), R.A. 17h59m40s.6, Decl. -25o13'24"
(2000.0). Kato also pointed out that no observations have been
reported since 1994 August.
The angular distance between these two stars is 15 arcsec. Therefore,
we must have recovered the outburst of this star. And the position in
IAUC 6051 is probably inaccurate.
Here is the magnitude reported in IAUC 6051.
1950 Jul 19B
1976 May 14-15B
1977 Jun 12R
1994 May 20 [12.5p
1994 Jun 17 [11.5p
1994 Jul 3 [11:p
1994 Jul 28.520 11.4p
1994 Aug 8.548 11.4p
1994 Aug 10.161 12.41V
There is no data recorded in the IRAS Point Source Catalog, therefore
it must be faint in IR-band in 1983.
At the position of the star discovered in the MISAO Project, there is
a bright star USNO-A2.0 0600.29859229, however, no data is recorded in
the USNO-A1.0 catalog.
USNO-A2.0 0600.29859229 17 59 39.613 -25 13 30.30 12.1R 14.2B
Hitoshi Yamaoka investigated the DSS-1 and the DSS-2 images and found
this star on them. On the DSS-1 blue UK Schmidt plate taken on
Sept. 15, 1987, it was as bright as USNO-A1.0 0600.14859958, 15.2
mag(R), 16.8 mag(B). On the DSS-2 red UK Schmidt plate taken on
Sept. 7, 1991, it was very bright, brighter than USNO-A1.0
0600.14861605, 11.7 mag(R), 15.0 mag(B), as bright as (or a bit
brighter than) USNO-A1.0 0600.14850922, 11.2 mag(R), 11.8 mag(B), and
a bit fainter than USNO-A1.0 0600.14874588, 10.9 mag(R), 12.2 mag(B).
At the position of NSV 24062 described in IAUC 6051, there is no data
recorded in the USNO-A1.0 and USNO-A2.0 catalogs, and no star was
found on the DSS-1 and the DSS-2 images. But 10 arcsec from the
position, there is a star USNO-A1.0 0600.14859811, 13.3 mag(R), 15.0
mag(B) = USNO-A2.0 0600.29861167, 12.5 mag(R), 15.3 mag(B).
The finding chart of this star based on the Kadota's images is
available at:
http://vsnet.aerith.net/pub/NSV24062.gif
Best regards,
Date: Sat, 1 Apr 2000 01:30:52 -0600
From: Seiichi Yoshida <comet@aerith.net>
Subject: [vsnet-alert 4528] Re: Recovery of NSV 24062
Dear colleagues,
Additional information on NSV 24062:
> At the position of NSV 24062 described in IAUC 6051, there is no data
> recorded in the USNO-A1.0 and USNO-A2.0 catalogs, and no star was
> found on the DSS-1 and the DSS-2 images. But 10 arcsec from the
> position, there is a star USNO-A1.0 0600.14859811, 13.3 mag(R), 15.0
> mag(B) = USNO-A2.0 0600.29861167, 12.5 mag(R), 15.3 mag(B).
USNO-A1.0 0600.14859811 was detected on Kadota's images just besides
NSV 24062. It was about 12.3C mag on all images. No variability was
confirmed.
Best regards,
Date: Tue, 4 Apr 2000 19:59:55 -0500
From: Seiichi Yoshida <comet@aerith.net>
Subject: [vsnet-alert 4560] Re: Recovery of NSV 24062
Dear colleagues,
Final information on NSV 24062:
KenIchi Kadota observed this star again on Mar. 31 with 0.18-m f/5.5
reflector and CCD. The astrometry of this object by Kadota using 12
stars in the GSC-ACT is R.A. 17h59m39s.58, Decl. -25o13'29".1
(2000.0), which confirmed the position in IAUC 6051 is inaccurate.
NSV 24062 brightened about 1 mag between last one month. Here are the
all photometry measured by the PIXY system using the USNO-A1.0 catalog
from Kadota's images.
1999 Apr 8.75186 11.4C
1999 Apr 8.75242 11.4C
1999 Apr 30.74588 10.8C
1999 Apr 30.74631 10.9C
1999 Sep 23.42939 11.6C
1999 Sep 23.42981 11.5C
2000 Feb 24.83137 12.4C
2000 Mar 31.80051 11.5C
2000 Mar 31.81255 11.4C
Best regards,
--
Seiichi Yoshida
comet@aerith.net
http://vsnet.aerith.net/
======
YYYYMMDD(UT) mag observer
19980620.652 100C (MISAO Survey)
19980620.653 98C (MISAO Survey)
19990408.751 114C (MISAO Survey)
19990408.752 114C (MISAO Survey)
19990430.746 108C (MISAO Survey)
19990430.746 109C (MISAO Survey)
19990923.429 115C (MISAO Survey)
19990923.429 116C (MISAO Survey)
20000224.831 124C (MISAO Survey)
20000324.403 140V (S. O'Connor)
20000331.800 115C (MISAO Survey)
20000331.812 114C (MISAO Survey)
20000406.376 12.99V (S. O'Connor)
20000413.348 128V (S. O'Connor)
20000515.292 137V (S. O'Connor)
20000527.298 142V (S. O'Connor)
20000612.273 155V (S. O'Connor)
20000619.212 154V (S. O'Connor)
20000624.198 154V (S. O'Connor)
20000707.181 <153V (S. O'Connor)
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