AAVSO Alert Notice 546Dr. Noel Richardson (University of Toledo) and colleagues have requested AAVSO assistance in optical monitoring of the bright, colliding-winds binary V1687 Cyg (WR 140, HD 193793) as part of their multi-wavelength campaign on this system.
Dr. Richardson writes: “WR 140 (HD 193793)…is a long-period (P~8yr), highly … Read the rest of this article
AAVSO Alert Notice 544Discovered by: Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan) (reported by S. Nakano, Sumoto, Japan, via CBET 4285)
Discovery magnitude: 12.4 unfiltered CCD on three 10-s CCD frames, using a 200-mm-f.l. f/3.2 lens with a Canon EOS 5D digital camera
Discovery date: 2016 June 10.629 UT
Coordinates (2000.0): R.A. 17 38 19.31 … Read the rest of this article
AAVSO Alert Notice 539Ms. 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 … Read the rest of this article
AAVSO Alert Notice 538Dr. Jeno Sokoloski (Columbia University) and Mr. Adrian Lucy (graduate student, Columbia University) have requested AAVSO observations of the jet-driving symbiotic star V694 Mon (MWC 560), which is in outburst, in support of upcoming Chandra observations to investigate the state of the inner … Read the rest of this article
AAVSO Alert Notice 537Dr. Donald F. Collins (AAVSO member, Swannanoa, NC), Dr. Robert Zavala (US Naval Observatory, Flagstaff Station), and Jason Sanborn (Lowell Observatory) request high time-resolution observations of the bright eclipsing star b Persei during an expected secondary eclipse of the third star of the system … Read the rest of this article
AAVSO Alert Notice 536Further to AAVSOSpecial Notice #412, Dr. James Miller-Jones (International Centre for Radio Astronomy Research, Curtin University, Perth, Western Australia) and colleagues have requested AAVSO assistance in support of their multiwavelength (radio and optical) campaign on the dwarf nova SS Cyg. Close monitoring of SS Cyg … Read the rest of this article
AAVSO Alert Notice 530Event: Nova Aquilae 2015 = ASASSN 15-qd = PNV J19215012+1509248
Independent discovery by: Read the rest of this article
– Koichi Itagaki (Teppo-cho, Yamagata, Japan), reported by S. Nakano (Sumoto, Japan)
– All-Sky Automated Survey for Supernovae (ASAS-SN, http://www.astronomy.ohio-state.edu/~assassin/index.shtml), reported by B. J. Shappee (Hubble Fellow, Carnegie Observatories) et …
AAVSO Alert Notice 529Dr. 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 … Read the rest of this article
AAVSO Alert Notice 523In AAVSO Alert Notice 522 on the upcoming observations of the black hole X-ray binary V404 Cyg by HST, the date of the detection by the Swift satellite was incorrectly given as 2015 June 16.77197 UT (Barthelmy et al., GCN Circular 17929). The correct date is … Read the rest of this article
AAVSO Alert Notice 522The dramatic outburst of the black hole X-ray transient LMXB V404 Cyg continues. It was detected 2015 June 16.1688 UT at 16.18 CV +/-0.035 by E. Muyllaert (MUY, Oostende, Belgium); the first satellite detection was by Swift on June 16.77197 UT (Barthelmy et al., GCN Circular 17929… Read the rest of this article
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