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AAVSO International Database

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

August 11, 2016

Event: Nova in Sagittarius

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 546: Campaign on V1687 Cyg (WR 140)

August 3, 2016: Dr. Noel Richardson (University of Toledo) and colleagues have requested AAVSO assistance in optical monitoring of the bright, colliding-winds binary V1687 Cyg (WR 140, HD 193793) as part of their multi-wavelength campaign on this system.

Alert Notice 545: FO Aqr time-series observations requested

July 13, 2016: Dr. Colin Littlefield (University of Notre Dame) and colleagues Drs. Peter Garnavich (Notre Dame), Erin Aadland (Minnesota State), and Mark Kennedy (University College Cork) have requested AAVSO assistance in monitoring the intermediate polar cataclysmic variable FO Aqr beginning immediately.

Dr. Littlefield, who with his colleagues recently published ATel #9216 and #9225, writes:

Special Notice #418: RX And monitoring needed for VLA observations

July 5, 2016: Further to AAVSO Alert Notice 539, Deanne Coppejans and colleagues request optical monitoring of the Z Cam dwarf nova RX And in support of their campaign to observe it with the Very Large Array (VLA) in their ongoing radio jet research.

Deanne writes in a post to the AAVSO Forum thread on this campaign: "We are going to try and catch RX And in quiescence again in the next three weeks. The optical coverage of it is still sparse, so any observations you take of it will be extremely useful."

Special Notice #55: Possible Nova in Vul [Nova Vul 2007, V458 Vul]

August 8, 2007

CBET 1027 reports that Hiroshi Abe has discovered a new bright nova [Nova Vul 2007, V458 Vul] around August 8, at coordinates

19:54:24.64 +20:52:51.9 J2000

and with brightness V=9.4mag. A possible progenitor star is visible on the POSS-I survey plates at about V=18.

This sounds like an ideal target for northern observers. You can plot the field using VSP:

obsolete link: [http://www.aavso.org/observing/charts/vsp/index.html]

2016 link: https://www.aavso.org/vsp

Special Notice #54: Fading of 1544+28A R CrB

August 6, 2007

R CrB: 15:48:34.41 +28:09:24.3 (2000.0)

The prototype of its class and characterized by random fadings from maximum light, 1544+28A R Coronae Borealis continues to fade in brightness. Observations reported to the AAVSO indicate that the present fading from its maximum visual magnitude of 6.0 began in early July 2007. Fading slowly to about magnitude 7.0 by July 17, it remained at that magnitude before continuing to fade again on July 22, since when it has declined more steeply, reaching magnitude 10.8 on August 6.

Special Notice #53: Update on V5558 Sgr

July 9, 2007

V5558 Sgr continues to brighten; recent reports from Neil Butterworth place this nova at V=6.5 or so. We recommend continued monitoring of this slow nova.

At V=6.5, this is an easy target for all observers, whether visual, PEP or CCD. The brightest comparison star on the current VSP chart is V=6.0, so given below is another, brighter, comparison star that we will add to the sequence in the next day or so:

HD 167264 RA=18:15:12.905 DEC=-20:43:41.76
label = 54 V=5.352 (B-V) = 0.050 (U-B) = -0.859

Special Notice #52: AM Her increasing in brightness

July 6, 2007

AM Her has been in an extended faint state (V=15.4) for the past two years. Just over the last few days, we have seen observations that show AM Her increasing in brightness by about a magnitude. While flaring of this order has occurred before, we ask that observers raise the priority of AM Her observations to keep an eye on this latest activity. There is the potential for triggering satellite observations if AM Her is going into outburst.

Arne Henden

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