Skip to main content

AAVSO International Database

Alert Notice 648: Semiregular variable reclassified as symbiotic: outburst of ASASSN-V J195442.95+172212.6 = Vend47 (Sge)

August 14, 2018

Event: ASASSN-V J195442.95+172212.6 (TCP J19544251+1722281 = Vend47), originally classified as a semiregular variable, has been reclassified as a symbiotic variable as a result of its being discovered in outburst by Robert Fidrich during the course of his "Vendégcsillag-kereső" (Guest Star Hunter) nova patrol program. Subsequent spectroscopy confirmed the nature of the object as a symbiotic variable.

Alert Notice 647: Nova in Ophiuchus - N Oph 2018 No. 3 = PNV J17422408-2053088

August 13, 2018

Event: Nova in Ophiuchus - N Oph 2018 No. 3 = PNV J17422408-2053088

Discovered by: C. Jacques, J. Barros, E. Pimentel, and P. Holvorcem, on behalf of the Brazilian Transient Search - BraTS (at SONEAR Observatory, Oliveira, Brazil); via TOCP

Discovery magnitude: unfiltered CCD magnitude 11.1 (on three frames, 10-sec exposure, using an astrograph 11" f/2.2 + CCD camera)

Discovery date: 2018 August 08.9596 UT

Alert Notice 646: VW Hyi in outburst and monitoring needed for multiwavelength campaign

August 6, 2018 : Further to AAVSO Alert Notice 640, the SU UMa-type dwarf nova VW Hyi is in outburst and is the subject of a multiwavelength campaign designed to detect possible radio emission during the outburst.

Alert Notice 645: Monitoring of LPVs for Maser Study

July 31, 2018: Michael Stroh (Ph.D. candidate, University of New Mexico) requests AAVSO assistance in monitoring 19 LPVs in support of a VLA campaign studying SiO masers. AAVSO monitoring begins now and goes through October 2019.

Alert Notice 644: FO Aqr monitoring requested in faint-state study

July 27, 2018: Dr. Colin Littlefield (University of Notre Dame) writes:

"In both 2016 and 2017, my colleagues and I requested AAVSO campaigns on the intermediate polar FO Aquarii to study its first-ever faint states. In both campaigns, we were delighted with both the quality and quantity of the data that we received from AAVSO observers [AAVSO Alert Notices 545, 598).

Alert Notice 643: Monitoring for Red Dots #2 campaign

July 25, 2018: John Strachan (Ph.D. candidate, Queen Mary University of London) and Dr. Guillem Anglada-Escude (Queen Mary University of London) have requested AAVSO assistance in the monitoring of three M dwarf stars as part of the Red Dots #2 campaign.

Alert Notice 642: ASASSN-18pe observing campaign

July 24, 2018: Dr. Matt Darnley (Astrophysics Research Institute, Liverpool John Moores University) and the AAVSO are requesting monitoring of ASASSN-18pe, the cataclysmic variable (possible long period dwarf nova) discovered 2018 July 10 by the ASAS-SN program (J. Strader et al. ATel #11867) at magnitude V = 15.8.

Alert Notice 641: V1490 Cyg multiwavelength campaign

July 24, 2018: Dr. Dirk Froebrich (University of Kent) has requested AAVSO observations to support their upcoming observations of V1490 Cyg. He writes:

"Background: We have recently discovered that the young star V1490 Cyg (situated in the Pelican Nebula IC 5070) is periodically occulted by material in its circumstellar disk(*). Our light-curves indicate a period of about 32 days, and the obscurations are comparable to UX-Ori type eclipses.

Alert Notice 639: CH Cyg coverage requested

Note: CH Cyg recovered in early August from the fading episode described below. However, ongoing coverage is extremely important, with V and particularly B being given priority over Rc and Ic. As always, visual observations are requested and encouraged. - Elizabeth O. Waagen, November 29, 2018

Alert Notice 638: Nova in Scutum - N Sct 2018 = TCP J18292290-1430460

July 2, 2018

Event: Nova in Scutum - N Sct 2018 = TCP J18292290-1430460

Discovered by: Yukio Sakurai (Mito, Japan)

Discovery magnitude: unfiltered CCD magnitude 10.3, on two frames using Nikon D7100 digital camera + 180-mm f/2.8 lens

Discovery date: 2018 June 29.5768 UT

Coordinates (2000.0): R.A. 18 29 22.93   Decl. -14 30 44.2  (from VSX)

Pages

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484