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AAVSO Alert Notice

Alert Notice 554: Observations of V420 Aur (HD 34921) needed to support spectroscopy

Note added October 4, 2016: In the original version of this Alert Notice, V420 Aur was referred to as V420 Oph in the sections on creating charts and reporting observations. Also, the range was given as V=7.15-7.35  when the correct value is V=7.35-7.51. The text below has been corrected. Apologies to the PI's for the error.

Alert Notice 553: Nova Lup 2016 = PNV J15290182-4449409 = ASASSN-16kt [V407 Lup]

September 27, 2016

Event: Nova in Lupus   [V407 Lup]

Discovered by: All Sky Automated Survey for SuperNovae (ASAS-SN) (K. Stanek (Ohio State University) et al., ATel #9538; reported to CBAT via J. Strader (Michigan State University))

Discovery magnitude: 9.11 V +/- 0.01, using ASAS-SN robotic 14-cm telescopes

Discovery date: 2016 September 24.010 UT
Coordinates (2000.0): R.A. 15 29 01.82  Dec. -44 49 40.9

Alert Notice 552: Gaia16aye microlensing event monitoring urgently requested

September 20, 2016 : Dr. Kirill Sokolovsky (National Observatory of Athens and Sternberg Astronomical Institute, Moscow State University), has requested AAVSO assistance in monitoring the ongoing microlensing event Gaia16aye beginning immediately to catch transient behavior occurring now and continuing through the end of October (or until further notice).

Alert Notice 551: GDS_J1701281-430612 monitoring for HST observations

Note added September 27, 2016: Dr. Reynolds adds the following: "Visual observations would be useful in setting a baseline and understanding how variable the source is in a relative sense at the time of our HST observation."

September 20, 2016: Dr. Mark Reynolds (University of Michigan) and colleagues have requested AAVSO assistance in monitoring the cataclysmic variable GDS_J1701281-430612 in support of HST/COS observations scheduled for early October.

Special Notice #420: OJ 287 very bright and Subscription reminder

September 13, 2016

OJ 287

S. Zola (Jagiellonian University) et al. (ATel #9489) report that the BL Lac object OJ 287 has emerged from conjunction optically very bright and increasing in brightness, according to their observations made at Mt. Suhora Observatory in August and September 2016.

Their observations and recent observations of this blazar in the AAVSO International Database include:

Alert Notice 550: Nova Sco 2016 No. 2 = PNV J17225112-3158349 = ASASSN-16kd [V1656 Sco]

September 9, 2016:

Event: Nova in Scorpius  [V1656 Sco]

Discovered by:  
- Shigehisa Fujikawa (Kan'onji, Kagawa, Japan; reported to CBAT via M. Soma (National Astronomical Observatory of Japan, Mitaka, Tokyo))
- All Sky Automated Survey for SuperNovae (ASAS-SN) (K. Z. Stanek et al., ATel #9469, published September 7; reported to CBAT via L. Chomiuk (Michigan State University))

Alert Notice 549: RX And Chandra observing campaign

September 1, 2016: Dr. Christian Knigge (University of Southampton) and colleagues have requested AAVSO coverage of the Z Cam dwarf nova RX And in support of Chandra X-ray observations to be carried out via a Target of Opportunity (TOO) triggering when the system is in a suitable outburst.

Alert Notice 548: AR Sco observing campaign

August 18, 2016: Dr. Thomas Marsh (University of Warwick) and colleagues have requested AAVSO coverage of the intriguing binary AR Sco in support of upcoming Newton-XMM observations.

The XMM observations of AR Sco have been scheduled for:
2016 September 10 15:41 - September 11 02:26 UT

Alert Notice 547: Nova Sgr 2016 No. 2 = ASASSN-16ig = TCP J18010780-2631434 [V5853 Sgr]

August 11, 2016

Event: Nova in Sagittarius  [V5853 Sgr]

Discovered by:  
- Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan) (CBET 4295);
- All Sky Automated Survey for SuperNovae (ASAS-SN) (K. Z. Stanek et al., ATel #9343)

Discovery magnitude:
- Nishiyama and Kabashima - 10.7 unfiltered CCD (2 frames using a 135-mm f/4 camera lens (+FLI 09000 camera))
- ASAS-SN - V~13.3

Alert Notice subscription message from AAVSO

July 22, 2016

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For a number of years the Alert Notices were sent using a text list of email addresses that was added to but not regularly edited, so many addresses in it are obsolete.


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