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AAVSO International Database

Alert Notice 515: SN 2015F in NGC 2442 (PSN J07361576-6930230)

March 31, 2015

Event: 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. -69 30 23.0  (2000.0)
SN 2015F is located 40" west and 84" north of the center of NGC 2442.

Alert Notice 514: RW Aur monitoring requested

March 24, 2015: Dr. Hans Moritz Guenther (Massachusetts Institute of Technology) has requested AAVSO observers' assistance with the classical T Tauri star RW Aur (component A). He writes:
 
"RW Aur A is a classical T Tauri surrounded by an accretion disk. It's a visual binary; the B component is fainter and shows no sign of a disk. The separation is 1.4 arcsec, but the B component is so much fainter (V = 13.6) that it's not a problem if the binary is not resolved.

Alert Notice 513: Request for observations of GW Lib in support of HST observations

March 18, 2015: Dr. Paula Szkody, University of Washington, has requested our help in monitoring the cataclysmic variable GW Lib for upcoming Hubble Space Telescope observations, scheduled to be made during the window 2015 April 22-25 UT. Dr. Szkody also observed this object with HST in March 2011 and March 2010 (see AAVSO Alert Notices 433 and 417, respectively).

Alert Notice 512: Nova Sagittarii 2015 No. 2 = PNV J18365700-2855420

March 16, 2015

Event: Nova Sagittarii 2015 No. 2 = PNV J18365700-2855420

Discovered by: John Seach, Chatsworth Island, NSW, Australia

Discovery magnitude: 6.0 using DSLR and 50mm f/1.0 lens

Discovery date: 2015 March 15.634 UT

Coordinates:  R.A. 18 36 56.84   Dec. -28 55 39.8  (2000.0)

Special Notice #400: BF Cyg observations requested

March 13, 2015: Dr. George Wallerstein (University of Washington) informed us that the symbiotic variable BF Cygni has brightened considerably over the past few weeks, and he is currently obtaining spectroscopy of it.  

Alert Notice 511: Monitoring requested for developing planetary systems dust production study

March 13, 2015: Dr. 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 Alert Notice 482).

Dr. Rieke writes: "We have obtained 130 hours of time on the Spitzer Space Telescope to continue monitoring planetary debris disks for variability. We are asking for help from AAVSO for this program.

Special Notice #399: GK Per in outburst

March 12, 2015: The old nova GK Per (N Per 1901), which has dwarf nova outbursts, is going into outburst, according to observations submitted to the AAVSO International Database:

Alert Notice 510: Observations of the symbiotic nova ASAS J174600-2321.3

March 5, 2015: The 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; the object was at V=12.28 on 2015 February 6.764 (OCN; S.

Alert Notice 509: Nova Sagittarii 2015 = PNV J18142514-2554343

February 18, 2015

Event: Nova Sagittarii 2015 = PNV J18142514-2554343

Discovered independently by:
- Hideo Nishimura (Shizuoka-ken, Japan)
- Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)

Discovery magnitude:
- Nishimura: DSLR magnitude 11.2, using 200-mm f/3.2 lens + digital camera
- Nishiyama and Kabashima: unfiltered CCD magnitude 10.9, using a 105-mm f/4 camera lens (+SBIG STL6303E camera)

Special Notice #397: Bright Transient in Sco (PNV J17032620-3504140)

February 11, 2015: Patrick Schmeer (SPK, Bischmisheim, Germany) reports the announcement on the CBAT Transient Object Confirmation Page (TOCP) of the discovery of a bright transient in Sco on 2015 February 11.8367 UT at unfiltered CCD magnitude 8.2 by Tadashi Kojima (Gunma-ken, Japan) using a 150-mm f/2.8 lens + a digital camera. Kojima reports nothing is visible on a frame from the same camera on Feb. 10.827 UT.

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