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AAVSO Alert Notice

Alert Notice 465: Nova Sagittarii 2012 No. 5 = PSN J18193700-1907400 [V5593 Sgr]

July 20, 2012

Nova Sagittarii 2012 No. 5 = PSN J18193700-1907400  [V5593 Sgr]

Discovered by: Tadashi Kojima (Tsumagoi, Agatsuma-gun, Gunma-ken, Japan) (reported by S. Nakano (Sumoto, Japan)

Discovery Magnitude: mag 12.6 on two frames using a Canon EOS 40D camera (+ 150-mm f/2.8 lens)

Discovery date: 2012 July 16.512 UT

Coordinates: R.A. 18 19 37.0  Decl. -19 07 40 (2000.0)

Alert Notice 464: Observers requested for Jovian Extinction Events (JEE2012)

July 5, 2012:  Scotty Degenhardt (Santa Fe, NM), a pioneer in the use of video for timing eclipses of solar system and stellar objects and a research member of the International Occultation Timing Association (IOTA), has informed the AAVSO of a research project he and colleagues are working on: modeling the Jovian dust field, moon atmospheres, and Io’s Torus through Jovian Extinction Events (JEE). He has invited AAVSO observers to participate by observing these Jovian extinction events and reporting their observations.

Alert Notice 463: Nova Sagittarii 2012 No. 3 = PNV J17522579-2126215 [V5591 Sgr]

July 3, 2012:

Event: Nova Sagittarii 2012 No. 3 = PNV J17522579-2126215  [V5591 Sgr]

Discovered independently by:
 - Koichi Itagaki (Yamagata, Japan, reported by Hitoshi Yamaoka, Kyushu University)
 - Yukio Sakurai (Mito, Ibaraki-ken, Japan)

Discovery Magnitude:
 - Itagaki: magnitude 10.3 on an unfiltered CCD image taken with a 0.21-m reflector
 - Sakurai: magnitude 9.9 on four 20-s frames taken with a Fuji FinePix S2 Digital Camera + Nikon 180-mm f/2.8 lens

Alert Notice 462: Monitoring of J1407 for next extrasolar ring system transit

CONTINUED THROUGH 2017

June 25, 2012: Dr. Eric Mamajek (Cerro Tololo Interamerican Observatory and University of Rochester) has requested AAVSO observers' assistance in monitoring the young star 1SWASP J140747.93-394542.6 to help determine the eclipse behavior related to a transiting ringed substellar companion.

This observing campaign begins now and continues until further notice. Dr. Mamajek writes:

Alert Notice 460: Possible occultation by Pluto from US East Coast

10 June 2012: We have been asked to help disseminate the news of a possible occultation by Pluto visible to observers on the US East coast. Although the AAVSO does not ordinarily issue announcements of upcoming occultations, in this case the object is Pluto and the NASA New Horizons mission (http://www.nasa.gov/mission_pages/newhorizons/main/index.html) will be visiting Pluto in 2015.

Special Notice #281: Revised timetable for AE Aqr MAGIC observations

15 May 2012: Dr. Christopher Mauche, Lawrence Livermore National Laboratory, has informed us that the timetable of MAGIC telescope  observations of the intermediate polar cataclysmic variable AE Aqr announced in AAVSO Alert Notice 458 has been revised. Here is the revised timetable for the dates in May and early June:

Alert Notice 457: Monitoring Nova Oph 2012 for multiwavelength observations [V2676 Oph]

April 10, 2012:  Dr. Michael Rupen (National Radio Astronomy Observatory, Socorro, NM) has informed us that he and his colleagues of the EVLA (Expanded Very Large Array) Nova Team are carrying out a multiwavelength campaign on the Fe II-type nova Nova Oph 2012 [V2676 Oph]. They have triggered observations with Swift, JVLA (Jansky Very Large Array), SMA (Submillimeter Array), and high-resolution optical spectroscopy. He is requesting AAVSO observations in support.

Alert Notice 456: Monitoring of V854 Cen Requested

April 4, 2012: Bram Ochsendorf (Leiden Observatory, Netherlands) has requested monitoring by AAVSO observers of the R CrB variable V854 Cen in support of observations to be made using the XSHOOTER instrument on the Very Large Telescope (VLT) of the European Southern Observatory's La Silla Paranal Observatory in Chile. Ochsendorf and colleagues have already observed V854 Cen at maximum and now need to observe it during a fading episode.

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