AAVSO Alert Notice 521The symbiotic variable AG Peg is in outburst, the first one observed since its only known outburst, which occurred in 1860-1870. Currently at visual/V magnitude 7.2 (B=7.8), it is an excellent target for visual, PEP, CCD, and DSLR observers and spectroscopists. The current outburst … Read the rest of this article
AAVSO Alert Notice 520V404 Cyg, an X-ray nova and a low mass X-ray binary (LMXB) with black hole component, is undergoing its first reported X-ray and optical outburst since 1989. Large scale, rapid variations are being reported in wavelengths from X-ray to radio by professional and amateur … Read the rest of this article
AAVSO Alert Notice 519Nova Sgr 2015 No. 2 (PNV J18365700-2855420; see AAVSO Alert Notice 512 at http://www.aavso.org/aavso-alert-notice-512) is undergoing a significant fading visually as its infrared excess increases, indicating that substantial dust production is underway.
Nova Sgr 2015 No. 2 was discovered by John Seach (Chatsworth … Read the rest of this article
AAVSO Alert Notice 517Dr. Axel Schwope (Leibniz Institute for Astrophysics Potsdam, Germany) has requested AAVSO observers’ assistance in monitoring the magnetic variable AM Her in support of upcoming XMM-Newton plus NuSTAR (Nuclear Spectroscopic Telescope Array) observations.
The XMM-Newton observations are scheduled for 2015 April 06 02:37:02-15:07:02 … Read the rest of this article
AAVSO Alert Notice 515Event: Supernova in NGC 2442: SN 2015F = PSN J07361576-6930230
Discovered by: Libert A. G. Monard, Calitzdorp, Western Cape, South Africa
Discovery magnitude: 16.8 unfiltered CCD using a 35-cm RCX400 telescope (+SBIG ST8-XME camera)
Discovery date: 2015 March 9.789 UT
Coordinates: R.A. 07 36 15.76 Dec. … Read the rest of this article
AAVSO Alert Notice 511Dr. George Rieke (University of Arizona) and colleagues have requested AAVSO assistance in monitoring four stars with developing planetary systems. The targets are RZ Psc, HD 15407A, V488 Per, and HD 23514. This campaign is similar to the one conducted in 2013 (see AAVSO … Read the rest of this article
AAVSO Alert Notice 510The AAVSO is requesting observations of the symbiotic nova candidate ASAS J174600-2321.3 during the predicted upcoming eclipse of this system. Observers are asked to begin observing immediately (2015 March 5), and continue observations through the end of July 2015. Both visual and instrumental observations are encouraged; … Read the rest of this article
AAVSO Alert Notice 508Event: Nova Scorpii 2015 = PNV J17032620-3504140
Discovered by: Tadashi Kojima, Gunma-ken, Japan
Discovery magnitude: unfiltered DSLR magnitude 8.1, using a 150-mm f/2.8
lens and digital camera
Discovery date: 2015 February 11.837 UT
Coordinates: RA: 17 03 26.18 , Decl: -35 04 17.6
Spectra: Echelle spectra by … Read the rest of this article
AAVSO Alert Notice 506Dr. Robert Zavala (USNO-Flagstaff) and collaborators request observations of the bright variable star b Persei for the next two weeks, in hopes of catching a predicted eclipse on 2015 January 15 UT. This is a follow-up to the February 2013 campaign announced in Alert Notice 476… Read the rest of this article
AAVSO Alert Notice 505Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen (Netherlands) and University of Cape Town) and colleagues have requested AAVSO observer assistance in monitoring several dwarf novae in support of their campaign to observe them in outburst with the Very Large Array (VLA) to search … Read the rest of this article
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