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[vsnet-campaign-news 72] AstroAlert: V660 Her rebrightening!
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The SU UMa-type dwarf nova V660 Her has brightened again!
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The SU UMa-type dwarf nova V660 Her, once faded from a short outburst,
has risen again! The short outburst should have been a precursor to
superoutburst! Time-resolved photometry during the present (likely)
main superoutburst is strongly encouraged. The combined data with the
Kyoto University observation of the precursor would be valuable in studying
the evolution from a precursor to the genuine superoutburst. An interval
of 7 days between the precursor and the main superoutburst is a relatively
long one.
YYYYMMDD(UT) mag observer
20010522.947 <153 (P. A. Dubovsky)
20010522.958 <156 (M. Reszelski)
20010523.033 <153 (G. Poyner)
20010523.953 <156 (G. Poyner)
20010523.964 <156 (M. Reszelski)
20010524.948 <156 (M. Reszelski)
20010524.965 155 (P. A. Dubovsky)
20010525.921 153 (P. A. Dubovsky)
20010525.978 147 (M. Reszelski)
20010529.964 <153 (G. Poyner)
20010530.224 <145 (M. Simonsen)
20010530.969 158: (C. P. Jones)
20010530.980 <153 (M. Reszelski)
20010531.965 144 (C. P. Jones) Rebrightening!
V660 Her is located at 17h 42m 09s.19, +23o 48' 30".6 (J2000.0)
The object is currently at mag 14.4.
Regards,
Taichi Kato
VSNET Collaboration team
We have been undertaking on photometric campaigns on several super-
outbursting dwarf novae and peculiar variable stars. News and call for
observations on these objects will be issued on our regular weekly
"News from VSNET" bulletins. Those who immediately need information
should make an access to the VSNET website, and click on VSNET campaign
list.
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VSNET (Variable Star Network) is an international variable star observing
network, covering various areas of novae, supernovae, cataclysmic variables
(CVs), X-ray transients, and other classical eruptive, pulsating, and
eclipsing variables. VSNET is one of invited contributing organizations
to the SkyPub AstroAlert system.
VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
CCD observations of such targets are a relatively easy task for a 20-40cm
telescope; simply take as many CCD frames (with exposure times 10-30 sec)
as possible, spanning several hours per night. The only requirements are
the weather and your patience! If you need more help on the observing
technique, please feel free to ask on the vsnet-campaign list.
We would sincerely appreciate volunteers who would join the VSNET
Collaboration team to study the wonders of these exotic variable stars.
To join the VSNET campaign collaborative list, send an e-mail to
vsnet-adm@kusastro.kyoto-u.ac.jp (VSNET administrator)
with a line "SUBSCRIBE vsnet-campaign." or your comment to join the
collaboration team.
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