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AAVSO Alert Notice

Alert Notice 655: Anticipated secondary eclipse of b Persei by its third star in November 2018

Note: Text revised October 30 to include date and time on which the predicted eclipse window is centered. It was further revised November 2 to correct the SAO number of b Per and to correct the position of the check star. - E. O. Waagen

Alert Notice 654: XZ Tau and HL Tau monitoring needed for Chandra observations

Note: The November 15 observation with Chandra has been rescheduled to 2018 Nov. 11 17:37 - Nov. 12 00:01 UT and 2018 Nov. 12 08:01 - Nov. 12 14:27 UT. Please see AAVSO Alert Notice 656 for details. - Elizabeth O. Waagen

Alert Notice 653: Nova in Norma: N Nor 2018 = PNV J16143400-5330050

October 26, 2018

Event: Nova in Norma - N Nor 2018 = PNV J16143400-5330050

Discovered by: Robert Kaufman (Bright, Victoria, Australia)

Discovery magnitude: 10.5 (DSLR green channel, approximately visual band)

Discovery date: 2018 October 13.414 UT

Coordinates (2000.0): R.A. 16 14 32.91    Decl. -53 30 15.2   (from VSX)

Alert Notice 652: Monitoring of nova-like variables in support of Chandra observations

October 11, 2018: Dr. Koji Mukai (NASA-Greenbelt Space Flight Center) has requested AAVSO assistance in monitoring several nova-like variables in support of upcoming Chandra observations. The first target, KQ Mon, is scheduled to be observed with Chandra during the week of 2018 October 15-22.

Alert Notice 651: Monitoring of T Pyx needed for HST observations

September 27, 2018: Dr. Ed Sion (Villanova University) requests AAVSO observers' assistance in monitoring the recurrent nova T Pyx, beginning immediately, in support of upcoming HST observations.

The HST COS observations have been scheduled to take place during the window of 2018 October 4 - 6. It is essential to know the status of T Pyx in order for the HST team to safeguard the instrumentation and make a final decision about approving the COS observations.

Alert Notice 649: Dwarf nova outburst of GK Per (N Per 1901)

August 24, 2018: The old nova GK Per (N Per 1901), which has dwarf nova (minor) outbursts, appears to be going into outburst, according to observations reported to the AAVSO. Recent observations include:

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.

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