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AAVSO Alert Notice

Alert Notice 569: Monitoring 1SWASP J162117.36+441254.2 for HST observations

February 15, 2017: Dr. Elmé Breedt (University of Warwick) has requested AAVSO observers' assistance in monitoring the eclipsing cataclysmic variable 1SWASP J162117.36+441254.2 (=CSS_J162117.4+441254) beginning now in support of observations scheduled with the Hubble Space Telescope for late February - early March.

Alert Notice 568: Nova in Scorpius - PNV J16521887-3754189

February 13, 2017

Event: Nova in Scorpius

Discovered by: Hideo Nishimura (Shizuoka-ken, Japan)

Discovery magnitude: magnitude 11.7 (CCD, unfiltered)

Discovery date: 2017 February 1.862 UT

Coordinates (2000.0): R.A. 16 52 18.87  Decl. -37 54 18.9 (from discovery and VSX)

Alert Notice 567: IM Nor monitoring requested for HST COS observations

February 10, 2017: Dr. Ed Sion (Villanova University) and colleagues have requested AAVSO observers' assistance in monitoring the symbiotic-type recurrent nova IM Nor in support of observations with the Hubble Space Telescope Cosmic Origins Spectrograph scheduled for 2017 February 13 - 17 UT.

These observations are part of a study on short orbital period recurrent novae as Supernovae Type Ia progenitors.

AAVSO Alert Notice 566: Beta Pic observations requested for BRITE-Constellation

January 31, 2017 : The BRIght Target Explorer-Constellation (BRITE-Constellation) satellite suite is obtaining high-precision photometry of selected very bright (mv < 4) stars. Its purpose is to investigate the "stellar structure and evolution of the brightest stars in the sky and their interaction with the local environment." The AAVSO is part of the BRITE-Constellation Ground Based Observations Team (GBOT), supporting cutting-edge science from the BRITE-Constellation satellites and coordinating with BRITE-Constellation scientist Dr.

Alert Notice 565: YZ Cnc Chandra observing campaign

December 19, 2016: Dr. Christian Knigge (University of Southampton) and colleagues have requested AAVSO coverage of the SU UMa-type dwarf nova YZ Cnc in support of Chandra X-ray observations to be carried out via a Target of Opportunity (TOO) triggering when the system is in a suitable outburst.

YZ Cnc has normal outbursts about every 7-10 days, and superoutbursts about every 100-110 days. The astronomers are planning to use a superoutburst to trigger the TOO observations.

Alert Notice 562: Photometry of V725 Tau needed immediately

November 15, 2016: Dr. Franco Giovannelli (Istituto di Astrofisica e Planetologia Spaziali di Roma) has requested AAVSO assistance in monitoring V725 Tau, the Be star in the high-mass X-ray transient A0535+26/HDE245770, in order to plan for the X-ray outburst that follows 8 days after the optical brightening that occurs at periastron passage.

Periastron passage will occur on 16 November 2016, so coverage is needed beginning immediately and continuing for at least 15 days after periastron, until December 2.

Alert Notice 561: Nova in Sagittarius = ASASSN-16ma = PNV J18205200-2822100

October 28, 2016

Event: Nova in Sagittarius

Discovered by:
 - ASAS-SN (K. Z. Stanek (Ohio State University) et al.; ATel #9669)
 - Yukio Sakurai (Mito, Japan; via TOCP page)

Discovery magnitude:
 - ASAS-SN: V~13.7, using quadruple 14-cm "Cassius" telescope at CTIO
 - Sakurai: 10.4 unfiltered CCD, using Nikon D7100 digital camera + 180-mm f/2.8 lens

Alert Notice 560: TCP J18102829-2729590 = Nova in Sagittarius

October 24, 2016

Event: Nova in Sagittarius = TCP J18102829-2729590

Discovered by: Koichi Itagaki (Yamagata, Japan) (reported to CBAT via S. Nakano (Teppo-cho, Yamagata, Japan))

Discovery magnitude: 10.7 unfiltered CCD, using 180-mm f/4.0 lens

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