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AAVSO International Database

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

July 3, 2018: The symbiotic variable CH Cyg is undergoing a fade that began on June 25. Multicolor photometry is requested; V and particularly B should take priority over Rc and Ic. Observations made two to three times a week are sufficient; time series observations are not needed. Visual observations are also requested and encouraged. Spectroscopy would be very welcome and appreciated. Coverage should continue throughout the observing season.

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)

Alert Notice 637: Nova in Lupus - N Lup 2018 = PNV J15384000-4744500

June 5, 2018

Event: Nova in Lupus - N Lup 2018 = PNV J15384000-4744500

Discovered by: Rob Kaufman (Bright, Victoria, Australia) at White Cliffs, NSW, Australia (via CBET 4520)

Discovery magnitude: 9.1 unfiltered CCD magnitude, object visible in 5 DSLR frames taken with 55mm lens (via CBET 4520)

Discovery date: 2018 June 03.4306 UT (via CBET 4520)

Alert Notice 635: Monitoring of SDSS J141118.31+481257.6 requested

May 25, 2018: Dr. Thomas Kupfer (University of California, Santa Barbara) has requested AAVSO assistance in monitoring the rare AMCVn binary SDSS J141118.31+481257.6 during its current WZ Sge-like outburst, the first outburst detected for this system.

The outburst was detected by Tadashi Kojima (Gunma-ken, Japan) on 2018 May 19.514 UT with a magnitude 12.6 V  +/- 0.2. At minimum brightness 19.7 CV, SDSS J141118.31+481257.6 brightened by over 6 magnitudes, reaching a peak brightness of 12.5-12.6 V.

Alert Notice 634: Nightly monitoring requested for V1280 Sco = N Sco 2007

May 11, 2018 : Dr. Frederick Walter (Stony Brook University) has requested AAVSO assistance in monitoring V1280 Sco (Nova Sco 2007).

After it appeared as a nova in February 2007 (AAVSO Alert Notice 346), V1280 Sco reached visual magnitude ~3.8 (several observers), then faded to about 13.2, brightened to about 12.7, and underwent a dust dip in June 2007 to <15.6 V (P. Nelson). It recovered to about 10.3 by about a year later.

Alert Notice 633: Nova outburst of V392 Per = TCP J04432130+4721280

April 30, 2018:

Event: Nova in Perseus - V392 Per = TCP J04432130+4721280

Discovered by: Yuji Nakamura (Kameyama, Mie, Japan; via CBET 4515)

Discovery magnitude: unfiltered CCD magnitude 6.2 (using a 135mm f4.0 lens; via CBET 4515)

Discovery date: 2018 April 29.474 UT (via CBET 4515)

Alert Notice 632: Fast photometry of symbiotic candidates requested

April 25, 2018: Dr. Jeno Sokoloski (Columbia University) and Mx. Adrian Lucy (graduate student, Columbia University) have requested AAVSO observations in support of a search underway by Mx. Lucy for symbiotic stars.

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