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AAVSO Special Notice

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

Special Notice #45: 1804-18 V5558 Sgr = Nova Sgr 2007

April 24, 2007

Coordinates: R.A. = 18h 10m 18.27s Decl. = -18o 46' 52.1" (2000.0)

Further to AAVSO Special Notice #44, 1804-18 Nova Sgr 2007 has been given the name V5558 Sgr by N. N. Samus, Institute of Astronomy, Russian Academy of Sciences, according to IAU Circular 8832 (Daniel W. E. Green, ed.).

Special Notice #44: Possible Nova in Sagittarius [V5558 Sgr]

April 20, 2007

CBET 931 (Gareth V. Williams, ed.) announces the discovery of a possible nova [V5558 Sgr] in Sagittarius by Yukio Sakurai, Mito, Ibaraki-ken, Japan, at magnitude 10.3 on two 20-s CCD exposures taken on Apr. 14.777 UT. Neither the USNO catalogue nor the Digitized Sky Survey indicates any precursor at the position of the new object.

K. Itagaki, Yamagata, Japan, provides the following position measured from his unfiltered CCD image that showed N Sgr 07 at magnitude 9.8 on Apr. 19.745 UT:

Special Notice #43: Possible Super Outburst of BZ UMa

April 14, 2007

The cataclysmic variable star BZ UMa is currently experiencing an outburst which is peculiar for that star. Historically, BZ UMa has outbursts every 312 +/-114 days (although it has been much more regular in the past decade). These outbursts are similar to regular UGSU outbursts with a fast rise and a short decay over four days and are absent of any superhumps or other periodicity. However, no superoutbursts of the type also associated with UGSU stars have been detected in BZ UMa despite good observational coverage since 1972.

Special Notice #42: Outburst of GW Lib

April 12, 2007

Rod Stubbings reports via Daisaku Nogami/VSNET that the cataclysmic variable GW Lib is currently in outburst, at a visual magnitude of 13.8. Follow-up observations are urgently requested. The object is located at

RA: 15h 19m 55.4s, Dec: -25d 00m 25s (J2000)

An AAVSO chart is available at the following URL:

http://www.aavso.org/cgi-bin/searchcharts3.pl?name=GW%20Lib]

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

 

Special Notice #40: Possible Nova in Oph [V2615 Oph]

March 21, 2007

As reported in CBET 900, Hideo Nishimura (Miyawaki, Kakegawa, Shizuoka-ken) and Yuji Nakamura (Kameyama, Mie, Japan) have discovered a possible new nova [V2615 Oph] around magnitude 10. The position is

17:42:44.00 -23:40:35.1 J2000

Naito and Narusawa at Nishi-Harima Astronomical Observatory obtained a low-resolution spectrogram that indicates this is an Fe-II type nova, with typical P-Cyg line profiles.

You can draw a chart of the region using the coordinates above and VSP:

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