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AAVSO International Database

Special Notice #414: SS Cyg monitoring continues for radio campaign

April 5, 2016: Further to AAVSO Alert Notice 536, close monitoring of the cataclysmic variable SS Cyg is urgently requested. Immediate notification of the beginning of the anticipated outburst is crucial and is requested.

The success of the multiwavelength (radio and optical) observing campaign on SS Cyg underway depends on immediate reporting of outburst behavior to trigger multi-site radio observations.

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 178: 1425-50 Nova Lupi 1993 AND Revised finder chart for 1806-29 Nova Sagittarii 1993 AND Successful completion of ORFEUS Mission AND Outburst of 0409-71 VW Hydri

Spetember 23, 1993

1425-50 NOVA LUPI 1993

We have been informed by our member William Liller, Vina del Mar, Chile, of his photographic discovery, using PROBLICOM, of a nova in Lupus at magnitude 8.0 (average of two photographs, TechPan film plus orange filter) on September 19.02 UT. The 1950 position, precessed from the equinox 2000 measurements provided by R.H. McNaught and G. J. Garradd, Anglo-Australian Observatory, is

RA 14h 28m 26.04s Decl. -500 57' 18.2"

Special Notice #242: SN 2011dh = Supernova in M51 = PSN J13303600+4706330

June 3, 2011: As an update to AAVSO Special Notice #241 (http://www.aavso.org/aavso-special-notice-241), the supernova in M51 has been designated SN 2011dh. Discovery, classification, and observation information have been published in IAU CBET 2736 (Daniel W. E. Green, ed.).

Coordinates: 13:30:05.08 +47:10:11.2  (J2000.0)
Coordinates source is Silverman et al., ATEL 3398

Observations should be submitted to the AAVSO International Database using the name SN 2011dh.

Thank you and good observing!

Alert Notice 541: V3661 Ophiuchi = Nova Oph 2016 = PNV 17355050-2934240

March 16, 2016

Event: Nova in Ophiuchus

Independent discovery by:  
 - Minoru Yamamoto (Okazaki, Aichi-ken, Japan, reported via H. Yamaoka, Kyushu University)
 - Yuji Nakamura (Kameyama, Mie, Japan, reported via Yamaoka)

Discovery magnitude:
 - Yamamoto: ~10.6 on four 15-second frames and using a Canon 5DMRK2 camera + 135-mm lens
 - Nakamura: ~10.6 on a 30-second CCD image and using a 135-mm lens  

Alert Notice 540: Secondary eclipse of b Persei is underway

March 10, 2016: Further to AAVSO Alert Notice 537, the anticipated secondary eclipse of b Per is underway, according to information from campaign astronomer Dr. Donald F. Collins. Dr. Collins writes:

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.

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