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AAVSO Alert Notice

Alert Notice 577: SN 2017eaw in NGC 6946 (PSN J20344424+6011359)

Correction: The original announcement of this Alert Notice included the incorrect assignment of observations made by David Boyd to David Blane. The attribution has been corrected in the observations below. We extend sincere apologies to David Boyd for the error. -- EOW  May 17, 2017

May 16, 2017

Event: SN 2017eaw - bright supernova in NGC 6946 (Cepheus)

Discovered by: Patrick Wiggins (Tooele, UT)

Alert Notice 576: Nova in Ophiuchus - TCP J17394608-2457555

May 11, 2017

Event: Nova in Ophiuchus

Discovered by: Koichi Itagaki (Yamagata, Japan)

Discovery magnitude: magnitude 13.6 (CCD, unfiltered, using 0.20-m f/3.0 reflector + CCD)

Alert Notice 575: Monitoring of Swift J1357.2-0933 (CRTS J135716.8-093238) requested

April 28, 2017: Dr. Gregory Sivakoff (University of Alberta) has requested AAVSO observers' assistance in monitoring Swift J1357.2-0933 (CRTS J135716.8-093238) during its current outburst.

Alert Notice 574: Monitoring of EPIC 204278916 requested

April 25, 2017: Dr. Carlo Manara (ESA Science and Technology SCI-S, the Netherlands) and colleagues have requested AAVSO assistance in monitoring the young, disk-bearing low-mass (M type) pre-main-sequence star EPIC 204278916 (2MASS J16020757-2257467).

Alert Notice 573: V2492 Cyg monitoring requested in support of XMM observations

April 6, 2017 : Dr. Nicolas Grosso (CNRS, Observatoire Astronomique de Strasbourg) has requested AAVSO assistance in monitoring the young eruptive star (FUOR type) V2492 Cyg from the optical to the infrared in support of X-ray observations with XMM-Newton scheduled for 2017 April 18 UT.

The XMM observations will take place: 2017-04-18 03:27:07 UT - 2017-04-18 14:17:07 UT.

Alert Notice 572: AG Dra monitoring requested

April 3, 2017: Dr. Rudolf Gális (Pavel Jozef Šafárik University (Slovakia)) and colleagues have requested AAVSO assistance in observing the symbiotic variable AG Dra. Observations are requested as a follow-up to spectroscopic observations and in order to monitor the system for an anticipated outburst.

Alert Notice 571: Observations Requested of Exoplanet Proxima Centauri b

March 16, 2017: Dr. Karen Collins (Vanderbilt University) has requested ground-based, follow-up observations of recently discovered exoplanet Proxima Centauri b. This exoplanet is a suspected Earth-size planet orbiting in the habitable zone of our nearest stellar neighbor, Proxima Centauri (V645 Cen). There exists a rough ephemeris of this target based on radial velocity measurements, so the predicted mid-transit times can vary +/- 6 hours. Therefore, it is requested that observations be as long as possible.

Alert Notice 570: NR TrA (Nova TrA 2008) monitoring in support of XMM observations

March 7, 2017 : Dr. Fred Walter (Stony Brook University) has requested AAVSO observers' assistance in monitoring NR TrA (Nova TrA 2008) in support of upcoming XMM Newton observations. The XMM observations will take place 2017 March 13 06:21 through March 14 10:34 UT.

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 [V1657 Sco]

February 13, 2017

Event: Nova in Scorpius  [V1657 Sco]

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)

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