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AAVSO International Database

Alert Notice 617: Multiwavelength observations of YZ Cnc, SU UMa, and CR Boo outbursts

March 5, 2018: Bob Jacobs (Ph.D. candidate, Radboud University) and Drs. Samaya Nissanke (Radboud University), Jennifer Barnes (Columbia University), and Deanne Coppejans (Northwestern University) have requested AAVSO observers' assistance in monitoring the cataclysmic variables YZ Cnc, SU UMa, and CR Boo. The goal is to build good multicolor light curves of two outbursts of CR Boo and two superoutbursts each of YZ Cnc and SU UMa.

AAVSO Alert Notice 616: Nova Sco 2018 No. 2 = PNV J16484962-4457032

February 13, 2018

Event: Nova in Scorpius: Nova Sco 2018 No. 2 = PNV J16484962-4457032

Discovered by: Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan, reported by S. Nakano, Sumoto, Japan, via CBET 4488)

Discovery magnitude: unfiltered CCD magnitude 11.7 (on five frames using a Canon EOS 6D digital camera+200-mm-f.l. f/3.2 lens)

Discovery date: 2018 February 6.863 UT
 
Coordinates (2000.0): R.A. 16 48 49.62  Decl. -44 57 03.2

Alert Notice 615: ASASSN-18ca = PNV J00423439+4044255 - Probable Nova in M31

February 12, 2018

Event: Probable Nova in M31: ASASSN-18ca = PNV J00423439+4044255

Discovered independently by:
- Koichi Itagaki (Yamagata, Japan; reported via CBAT TOCP)
- All Sky Automated Survey for SuperNovae (ASAS-SN) (reported by J. Brimacombe et al. in ATel #11275)

Alert Notice 614 : Monitoring of GW Lib to support XMM-Newton observation

February 12, 2018: Dr. Koji Mukai (NASA Goddard Space Flight Center) and colleagues have requested AAVSO observations of the WZ Sge type dwarf nova GW Lib in support of observations with the ESA XMM-Newton spaceobservatory scheduled for

2018 February 17  05:46:41 - 21:36:41 UT

Alert Notice 613: Nova Cir 2018 - PNV J13532700-6725110

January 31, 2018

Event: Nova in Circinus  -  Nova Cir 2018 = PNV J13532700-6725110

Discovered by: John Seach (Chatsworth Island, NSW, Australia)

Discovery magnitude: 9.1 unfiltered CCD (on three images, using DSLR with 50 mm f/1.2 lens)

Alert Notice 612: Nova Sco 2018 - PNV J17180658-3204279

January 31, 2018

Event: Nova in Scorpius  -  Nova Sco 2018 = PNV J17180658-3204279

Discovered by: Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan), reported by S. Nakano (Sumoto, Japan)

Discovery magnitude: unfiltered CCD magnitude 11.0 (three 10-second images using DSLR with 200-mm f/3.2 lens)

Discovery date: 2018 January 17.869 UT
 
Coordinates (2000.0): R.A. 17 18 06.37  Decl. -32 04 27.7 (from VSX)

Alert Notice 611: Flaring of Blazar 3C 279

January 26, 2018: AAVSO member/observer Adolfo Darriba (Madrid, Spain) informs us that Dr. Dave Thompson, Multiwavelength Coordinator for the Large Area Telescope (LAT) of NASA's Fermi Gamma-Ray Telescope, on behalf of the Fermi LAT Collaboration has called for observations of the blazar 3C 279, which is undergoing a major gamma-ray flare.

Alert Notice 610: Anticipated primary eclipse of b Persei by the third star

January 26, 2018: An AAVSO campaign on the bright star b Per has been launched at the request of Dr. Donald F. Collins, who writes:

Alert Notice 609: Nova Muscae 2018 - PNV J11261220-6531086

January 15, 2018

Event: Nova in Musca - Nova Muscae 2018 = PNV J11261220-6531086

Discovered by: Rob Kaufman (Bright, Victoria, Australia)

Discovery magnitude: 7.0 V (on four frames, using Canon 650D and 55mm lens)

Discovery date: 2018 January 14.4861 UT

Coordinates (2000.0):  R.A. 11 26 15.16  Decl. -65 31 23.3
Position from VSX; measured by Daniel Bamberger (Marburg, Germany) on frames taken by Robert Fidrich (Bakonycsernye, Hungary).

Alert Notice 608: TT Ari monitoring requested for VLA observations

December 1, 2017: Dr. Deanne Coppejans (Northwestern University) and colleagues have requested AAVSO assistance in monitoring the cataclysmic variable TT Ari in support of observations scheduled to be made with the Very Large Array (VLA) in December 2017.

Dr. Coppejans writes:

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