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Special Notice 255: Cataclysmic Variable in Draco = PNV J18422792+4837425

September 14, 2011: IAU CBAT Central Bureau Electronic Telegram 2818 (Daniel W. E. Green, ed.) announces the discovery by Hideo Nishimura, Miyawaki, Kakegawa, Shizuoka-ken, Japan, of a cataclysmic variable in Draco on 2011 Sept. 5.529 UT at magnitude 11.8 (reported by S. Nakano, Sumoto, Japan). The variable was designated PNV J18422792+4837425 when posted on the Central Bureau's TOCP webpage.

Three new eJAAVSO preprints

ej148: "Deep Infrared ZAMS FIts to Benchmark Open Clusters Hosting delta Scuti Stars" by D. J. Majaess, D. G. TUrner, D. J. Lane, T. Krajci

ej149: "Delta Scuti Behavior Detected in HD 349422" by G. Turner, R. Kaitchuck

ej150: "A Search for Eclipsing Binary Light Curve Variations Among MACHO Project Light Curves of 3,256 Fundamental-Mode RR Lyrae Variables in the Galactic Bulge" by M. W. Richmond

 

http://www.aavso.org/ejaavso

Alert Notice 447: Nova Sco 2011 No. 2 = PNV J16364440-4132340 = PNV J16364300-4132460 [V1313 Sco]

September 10, 2011

Event: Nova in Scorpius

Nova Sco 2011 No. 2 = PNV J16364440-4132340 = PNV J16364300-4132460  [V1313 Sco]

Discovered Independently by:
 - John Seach (Chatsworth Island, NSW, Australia)
 - Yuji Nakamura (Kameyama, Mie, Japan)
 
Discovery Date:
 - Seach: 2011 Sep. 06.37 UT (JD 2455810.87)
 - Nakamura: 2011 Sep. 06.4313 (JD 2455810.9313)

Discovery Magnitude:

Special Notice #254: T Pyx Campaign continues

September 10, 2011:  The outbursting recurrent nova T Pyx is past solar conjunction and is widely observable again. Arto Oksanen in Finland has been following it through July and August and reports it currently at 10th magnitude. Please add T Pyx back to your observing schedule if possible to follow the decline of its outburst.

Special Notice #253: Request for Observations of MAXI J1836-194

September 10, 2011: Dr. Gregory Sivakoff (U. of Alberta) requests observations of the X-ray binary star MAXI J1836-194 as part of the JACPOT collaboration studying stellar radio jets from compact binaries.  There is no predetermined duration for this campaign, but observations are requested now to coincide with ongoing X-ray and radio observations.

Supernova Chat 13 Sept at 4:00PM ET

Supernova 2011fe has been gaining a lot of interest, and not just among astronomers, either! News of SN 2011fe made "The News Hour" for instance.

Do you want to know why supernova explode?  What's the difference between a Type II and a Type Ia, or Ib, or Ic?  How can supernovae help us to understand the age of the universe? How do you get accurate photometry of supernova in the midst of the galactic background? Just what the heck does a "standard candle" mean and what does it have to do with the largest known explosions still happening in the universe?