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[vsnet-campaign-news 126] Nova Oph 2002 = HadV105, confirmed
Possible nova in Oph, reported by Katsumi Haseda, has been confirmed.
Excerpt from reports to VSNET:
From Doug West:
A new object is present at 17h 37m 34.60s -16o 23' 23.2" (+/- 0.6") with
magnitude V = 9.22 +/- 0.08. at 1/26/02 12:39 UT. The position is based on
CCD astrometry using 8 GSC stars. The comparison stars for photometry were
TYC 6248 1077 1 and TYC 6248 794 1. The check star was TYC 6248 291 1.
Additional R band and low resolution spectroscopy images were taken during
the same observing session. These observations will be reported as soon as
they are reduced.
Regards,
Doug West
Mulvane, KS, USA
Revised data:
Based on color correction made available by the Rc band image the earlier V
band magnitude estimate of the possible nova in Oph has been revised to the
following:
1/26/02
V = 9.19 +/- 0.05, 12:39 UT
Rc = 8.67 +/- 0.07, 12.44 UT
---
On 1/26/02 12:52 UT three low-resolution spectra of the potential nova in
Oph were taken with a nonobjective slitless spectrometer. Thin clouds were
present and the sky was becoming light due to the approaching dawn. The sky
conditions and the relative faintness of the object (V=9.2) resulted in a low
signal to noise ratio of ~3 for each spectrum. The spectrometer consists of a
transmission grating, an 0.2 m SCT, and a SBIG ST-8 CCD camera. The
wavelength is calibrated relative to A type stars. The standard deviation of
wavelength measurement is approximately 25 Angstrom.
All three spectra contained an emission peak at an average wavelength of 6598
Angstrom. This peak is within two standard deviations of the H alpha peak at
6562.81 Angstrom. From this measurement, I conclude that the new object in
Oph does exhibit H alpha emission.
Regards,
Doug West
Mulvane, KS, USA
---
Hirohisa Sato (Sukagawa, Japan) relays that Tsutomu Seki (Kochi, Japan)
recorded the following prediscovery image of the nova (Nova Oph 2002 =
HadV105).
2002 Jan. 19.854 (UT) approximate position 17h 37m 32s -16o 23'.5
(J2000.0)
photographic mag 8.9
(90mm F3.5 lens)
---
Independent discovery was reported by Yuji Nakamura (Mie, Japan),
as reported in IAUC 7808.
OPHnova2002 20020124.867 93p Nry
---
Please refer to the following page for further datails (discovery
photograph, identification charts and comparison stars):
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Novae/hadv105.html
Regards,
Taichi Kato
On behalf of the VSNET Collaboration team
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VSNET (Variable Star Network) is an international variable star observing
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(CVs), X-ray transients, and other classical eruptive, pulsating, and
eclipsing variables. VSNET is one of invited contributing organizations
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