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AAVSO International Database

Alert Notice 534: Nova Sgr 2015 No. 4 = PNV J18225925-1914148

November 3, 2015

Event: Nova Sgr 2015 No. 4 = PNV J18225925-1914148

Independent discovery by:  
 - Shigehisa Fujikawa (Kan'onji, Kagawa, Japan, reported via I. Endoh,
National Astronomical Observatory of Japan, Mitaka, Tokyo)
 - Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan, reported via S.
Nakano (Sumoto, Japan))
 - Minoru Yamamoto (Okazaki, Aichi-ken, Japan, reported via S. Nakano)

Special Notice #409: Chandra observations scheduled for RT Cru

October 30, 2015: Further to AAVSO Alert Notice 503, Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) informs us that the Chandra observations of the symbiotic variable RT Cru have been scheduled.

Alert Notice 533: Coverage of V5668 Sgr (Nova Sgr 2015 No. 2) requested in support of HST spectroscopy

October 30, 2015: Dr. Peter Kuin (Mullard Space Science Laboratory, University College London) and colleagues in the Swift Nova group have requested AAVSO observers' assistance in multicolor monitoring of V5668 Sgr (Nova Sgr 2015 No. 2, see AAVSO Alert Notices 512, 519) in support of an upcoming spectroscopic observation with the Hubble Space Telescope Imaging Spectrograph (STIS).

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.

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