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AAVSO International Database

Alert Notice 532: Observations requested for KIC 8462852

October 20, 2015: The AAVSO requests time-series observations of the enigmatic variable object KIC 8462852 beginning immediately and continuing through at least the end of the current observing season. The star is relatively bright (V=11.88) and shows aperiodic dips of a few tenths of a magnitude, the causes of which are unknown. The object is not known to be a close binary or a young stellar object, and there are no other typical indicators of circumstellar material such as infrared emission.

Alert Notice 531: Nova Ophiuchi 2015 Number 2 = TCP J17344775-2409042

October 14, 2015

Event: Nova Oph 2015 No. 2 = TCP J17344775-2409042

Independent discovery by:  
 - Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)
 - Shigehisa Fujikawa (Kan'onji, Kagawa, Japan)

Discovery magnitude:
 - Nishiyama and Kabashima: 11.8 unfiltered (CCD, using a 135-mm f/4 camera lens (+FLI 09000 camera))
 - Fujikawa: 12.1 unfiltered (CCD using a MINOLTA F 3.5 f 120mm lens)

Alert Notice 530: Nova Aquilae 2015 = ASASSN 15-qd = PNV J19215012+1509248

October 8, 2015

Event: Nova Aquilae 2015 = ASASSN 15-qd = PNV J19215012+1509248

Independent discovery by:  
 - Koichi Itagaki (Teppo-cho, Yamagata, Japan), reported by S. Nakano (Sumoto, Japan) (via CBET 4147)
 - All-Sky Automated Survey for Supernovae (ASAS-SN), reported by B. J. Shappee (Hubble Fellow, Carnegie Observatories) et al.

Special Notice #408: Developing planetary systems dust production study - second segment of observations

October 2, 2015:  Further to AAVSO Alert Notice 511, issued in March 2015, Dr. George Rieke (University of Arizona) and colleagues' campaign to monitor planetary debris disks for variability using the Spitzer Space Telescope continues. AAVSO observations are requested to rule out variability of the stars themselves.

The second segment of observations of the four targets takes place from now into January 2016 according to the schedule below.

Alert Notice 529: Observing campaign on 5 variables in Cygnus

October 1, 2015:  Dr. George Wallerstein (University of Washington) has requested AAVSO assistance in monitoring 5 variable stars in Cygnus now through December 2015. He is working to complete the radial velocity curves for these stars, and needs optical light curves for correlation with the spectra he will be obtaining.

Alert Notice 528: Nova Sagittarii 2015 Number 3 = PNV J18033275-2816054

September 29, 2015

Event: Nova Sgr 2015 No. 3 = PNV J18033275-2816054

Independently discovered by:
- Koichi Itagaki (Teppo-cho, Yamagata, Japan)
- Akira Takao (Kitakyushu, Japan)
- Yuji Nakamura (Kameyama, Mie, Japan)

Discovery magnitude:
- Itagaki: 9.9 U (CCD, using a 180-mm focal length camera lens)
- Takao: 10.5 U
- Nakamura: magnitude not reported (135-mm focal length camera lens)

Special Notice #407: Blazar S5 1803+78 active

September 2, 2015:  AAVSO observer Adolfo Darriba Martinez y Oscar Ortuño (DAM, Observatorio Las Casqueras, Madrid, Spain) reports that the blazar S5 1803+78 has brightened significantly.

S5 1803+78, which is magnitude 16-17 V at minimum, is currently magnitude 14.237 V (LPAB, P. Lampens-Vancauteren (Ukkel, Belgium).

Previous outbursts are recorded in the AAVSO International Database in November 2007, February 2012, and September 2014.

Alert Notice 526: Monitoring of LS IV -14 116 in support of upcoming satellite observations

August 20, 2015Prof. Simon Jeffery (Armagh Observatory; Trinity College Dublin) has requested photometric monitoring of the pulsating helium and zirconium-rich hot subdwarf LS IV -14 116 in support of upcoming HST and VLT/UVES spectroscopy. AAVSO observations will supplement photometry due to be obtained with the SAAO 1.0-m and IAC 0.8-m telescopes from 18 August to 2 September 2015. Photometry is requested beginning immediately through 2 September.

Alert Notice 524: Observing campaign on 17 cataclysmic variables

July 16, 2015: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance with his campaign to observe 17 cataclysmic variables (CVs) with the William Herschel Telescope (WHT) next week.

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