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AAVSO Alert Notice

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.

Alert Notice 631: Coverage requested for current outburst of AG Dra

April 24, 2018: Drs. Jaroslav Merc and Rudolf Gális (both of the Pavel Jozef Šafárik University (Slovakia)), on behalf of their scientific team, have requested AAVSO assistance in observing the symbiotic variable AG Dra as a follow-up to spectroscopic observations and in order to monitor the system in its current outburst, which began in early April.

Alert Notice 630: Coverage needed TONIGHT for ASASSN-18ey = MAXI J1820+070

April 11, 2018: Dr. Gregory Sivakoff (University of Alberta), on behalf of a large number of collaborators, has requested AAVSO observers' assistance in monitoring the outbursting black hole X-ray binary ASASSN-18ey = MAXI J1820+070 in support of a multiwavelength "blitz" campaign taking place tonight and into tomorrow.

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