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[vsnet-campaign-news 75] AstroAlert: V478 Her brightening?
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Possible Brightening of the Poorly Known Cataclysmic Variable
V478 Herculis
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According to AAVSO News Flash No. 793, the recently identified
cataclysmic variable V478 Her may be brightening.
CCD observation by Diethelm recoreded the object at 15.70 on June 4.9599 UT.
The object had been regarded as an irregular variable (IS:) until
quite recently. The reported range of variability if 15.5-17.1p.
Confirmation of the brightening, and subsequent detailed observations
are very strongly encouraged.
V478 Her is located at: 17h 21m 05s.60, +23o 39' 36".9 (J2000.0)
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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vsnet-adm@kusastro.kyoto-u.ac.jp
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