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AAVSO International Database

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: []

2016 link:

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


Special Notice #51: V5558 Sgr chart update

June 29, 2007

The slow nova V5558 Sgr appears to be close to orbrighter than m(vis) = 7.6, and brighter comparisonstars than the initial bright limit of the chartmay be required. If necessary, please use the two additional comparison stars for this object that may be obtained by plotting a 240-arcmin chart with VSP:

obsolete link: []

2016 link:

Special Notice #49: Possible Nova in Nor [V390 Nor]

June 17, 2007

Bill Liller has informed us of a possible nova in Norma [V390 Nor], with the approximate coordinates of

RA 16:32.2 DEC -45:08 J2000

with approximate magnitude of 9.4 and outburst date around June 15.086UT.

Michael Linnolt confirmed this new object visually, with approximate location of

16:32:12 -45:08:40 J2000

and an approximate magnitude of V=10.2 on June 17 at 0811UT.

Special Notice #48: Update on V5558 Sgr [Nova Sgr 2007]

June 8, 2007

V5558 Sgr, a nova that went into outburst in April (see Special Notices 44 and 45), continues to increase in brightness. The last reports indicate that this nova has reached V=8.6, brightening by about 0.02mag per day. We have produced a new sequence, based on recent calibration from Sonoita Research Observatory along with nearby Tycho2 and GCPD stars. You can download this sequence as part of the VSP chart:

Special Notice #47: Increased Activity in P Cyg

May 19, 2007

P Cyg (2014+37A) is the prototype of massive stars with high mass outflow; it is characterized by blue-shifted emission lines along with red-shifted absorption lines. Surprisingly, we've never created a Variable Star of the Season article for this neat star - I'll have to make sure that happens soon.

Located at

20:17:47.20 +38:01:58.5 J2000


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