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dwarf nova

Alert Notice 180: 2337+56 Nova Cassiopeiae 1993 [V705 Cas] AND Special request to monitor dwarf novae

February 8, 1994

2337+56 NOVA CASSIOPEIAE 1993  [V705 Cas]

This bright nova, discovered on December 7.47 UT by Syuichi Nakano of Japan at photographic magnitude 6.5 (see AAVSO Notice 179), has been very well monitored by observers worldwide. Its optical light curve, created from observations reported to the AAVSO, indicates it brightened to about visual magnitude 5.7 by mid·Oecember, and then has slowly declined to magnitude 8.4 by February 7, with fluctuations as much as 1 magnitude in amplitude.

Alert Notice 539: Dwarf novae observations requested for VLA campaign

March 1, 2016: Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen (Netherlands) and University of Cape Town) and colleagues have requested AAVSO observer assistance in monitoring several northern dwarf novae in support of their campaign to observe them with the Very Large Array (VLA) in their ongoing radio jet research. Their research on radio jets in dwarf novae has been discussed in AAVSO Alert Notice 505.

Special Notice #413: SU UMa observations needed now

February 23, 2016: Deanne Coppejans (Department of Astrophysics, Radboud University Nijmegen) requests observations of the dwarf nova SU UMa now in order to determine its status. She and colleagues observed it on 20 February 2016 with the Very Large Array (VLA) and need to know whether it is (was) in outburst.

Observations of SU UMa in the AAVSO International Database from around the time of the VLA observations show it to be in quiescence:

Special Notice #399: GK Per in outburst

March 12, 2015: The old nova GK Per (N Per 1901), which has dwarf nova outbursts, is going into outburst, according to observations submitted to the AAVSO International Database:

Alert Notice 505: Monitoring of Northern dwarf novae for radio jets campaign

October 24, 2014: Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen (Netherlands) and University of Cape Town) and colleagues have requested AAVSO observer assistance in monitoring several dwarf novae in support of their campaign to observe them in outburst with the Very Large Array (VLA) to search for radio jets.

Special Notice #388: Outburst of VSX J213806.5+261957

October 23, 2014: Carey Chiselbrook (Georgia, United States; AAVSO observer code CCY) observed the WZ Sge-type dwarf nova VSX J213806.5+261957 in outburst at a visual magnitude of 9.7 on 2014 October 22.0590 (JD 2456952.55903). Prior to the outburst detection,  the last observation (also by CCY) indicated the star was not in outburst less than 24 hours prior (mvis < 13.8 at JD 2456951.6326).

Special Notice #15: V1316 Cyg Monitoring Campaign

July 14, 2006: Gary Poyner, Jeremy Shears and David Boyd (all BAA-VSS) have requested help in monitoring the dwarf novae V1316 Cyg for outbursts in the current observing season.

Typically, V1316 Cyg experiences many brief outbursts that can last from less than a day to 3 days with an amplitude of less than 2 magnitudes. Poyner et al. have recently authored a paper describing this behaviour for the Journal of the BAA. It is available online in preprint form at this URL:

Special Notice #3: Possible New Nova/Dwarf Nova in Hya

January 27, 2006: Grzegorz Pojmanski, Warsaw University Astronomical Observatory, reports on a possible new nova or dwarf nova discovered by the ASAS3V instrument. The previously unobserved object was first detected by ASAS3V at RA = 10h 22m 22s DEC = -15d 42'.4 (assumed J2000) on Jan 26.245 UT at magnitude 12.219 in V.

Complete ASAS-3 CCD V observations of the new object:

Jan 23.260 <14 Jan 26.245 12.219 Err: 0.047

Jan 27.346 12.476 Err: 0.084

Jan 27.349 12.492 Err: 0.076

Jan 27.352 12.469 Err: 0.084

Special Notice #2: Possible New Nova/Dwarf Nova in Cet

January 21, 2006: Bogumil Pilecki, Warsaw University Astronomical Observatory, reports on a possible new nova or dwarf nova discovered by the ASAS3V instrument. The previously unobserved object was first detected by ASAS3V at RA = 02h 33m 22s DEC = -10d 47'.0 (assumed J2000) on Jan 20.121 UT at magnitude 12.08 in V.
 
The new object has been confirmed by the following AAVSO CCD observations:
Jan 21.779 12.58 Err: 0.02 V David Boyd England
Jan 21.9136 13.18 Err: N/A Clear? Diego Rodriguez Spain

Special Notice #200: Outburst of the infrequently outbursting dwarf nova KX Aquilae

March 9, 2010: Observer Tomas L. Gomez (Madrid, Spain) reports that the infrequently outbursting dwarf nova KX Aql is currently in outburst. Gomez detected the star at an unfiltered magnitude of 13.58 on 2010 March 9.242 UT (JD 2455264.742). This system has been poorly observed over the past few months; the most recent observation of KX Aql was also by T.L. Gomez, who reported a fainter-than unfiltered magitude of < 15.12 on 2010 February 20.2617 (2455247.7617). Thus the starting time of the current outburst is not yet known.
 

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