[vsnet-chat 984] V803 Centauri

["William S G Walker" <astroman@voyager.co.nz>]

Greetings, All,

The helium CV V803 Centauri may be approaching another bright outburst.
Based on previous observations it might happen in the next 7 - 21 days. I
would be interested in receiving advice from anyone who sees it. 'Normal'
outbursts appear to peak at about V = 13.7 and on June 15 were peaking at
0700 UT. They are about 30-60 minutes earlier each night. 

I've been working on a sequence for visual measures but the weather in
northern NZ has been atrocious. The following very provisional magnitudes
are listed for visual observers. The offsets are from the variable in
arcseconds, based on a preliminary chart from Bruce Sumner. The table gives
Vmag in tenths, EW offset, NS offset.

122	E236"	S105"
129	W405	S127
130	E5	N245
134	E8	S118	Elvius
137	W243	N145
139	E65	N68	Elvius
140	E25	N138
141	W108	N18	Elvius
142	E85	S103	Elvius
146	E80	S228
150	W28	S103
151	E90	S168

In its normal state V803 cycles between 137 and about 150 with a period of
23 hours +/- 30 minutes. The bright outbursts appear to reach about 132 and
then fade after 2-3 days to about 160. But a lot of this is inference from
a very small number of observations. Perhaps these magnitudes will make
observing this star more popular.

Internal accuracy of these is probably about +/- 0.05 magnitudes. From some
of the visual results I suspect that the Elvius sequence, on which this is
based, might be a little faint. We're still hoping for some better weather
to do a good job.

Regards,
Stan Walker

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