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[vsnet-alert 4183] RX J0909.8+1849 in outburst

RX J0909.8+1849  (UG)

RXJ0909.8+1849  20000203.443  149C  Scp
RXJ0909.8+1849  20000204.293  149C  Scp
RXJ0909.8+1849  20000207.432  129C  Scp
RXJ0909.8+1849  20000210.303  148C  Scp
RXJ0909.8+1849  20000211.316  135C  Scp
Sequence:   USNO-A2.0 (red magnitudes)
Instrument: IRO (0.5-m RCT + AP-8)

This outburst looks pretty strange. Either on Feb. 7 the object underwent a
precursor outburst to the current (super?)outburst, or an eclipse was observed
on Feb. 10.303 UT. I have already brought this interesting fact to Tonny
Vanmunster's, Taichi Kato's and Makoto Uemura's attention in time for their
observing runs tonight. Hopefully they will be able to clarify the situation.
Anyway, superhumps and/or eclipses are very probably awaiting their detection,
and time-resolved photometry throughout the outburst are very strongly
recommended.

USNO-A2.0 data for RX J0909.8+1849: 090950.571 +184948.15 (2000.0) 15.2 15.8

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Excerpt from [vsnet 1361] (1998 Mar. 24):

New CVs from "The Hamburg/RASS Catalogue of Optical Identifications"

RXJ0909.8+1849 = 090950.5  +184947 (2000.0) 16.4 CV
    = GSC1404.1830 090950.56 +184947.2 (2000.0) 12.53 1
    = USNO1050.06072866 090950.576 +184947.62 (2000.0) 15.3 16.6

  The first line of each star represents Hamburg/RASS identification.
Some of these ROSAT CVs show considerable variation between GSC/USNO/Hamburg
magnitudes.  For example, RXJ0909.8+1849 and RXJ0915.8+0900 were clearly
in outburst or bright state at the epoch of GSC observation, while
RXJ1437.0+2342 was probably in outburst at the time of Hamburg observation.

  Follow-up observations are strongly encouraged!

Regards,
Taichi Kato
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Good observing!
Patrick

P.S.:
On 18h05m UT this evening I observed both the (yellowish) Space Shuttle and
the (reddish) external tank with the naked eye - 22 minutes after having
watched the launch of STS-99 Endeavour live on Sky News and CNN.

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