Skip to main content

AAVSO Special Notice

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:

Special Notice #39: V2467 Cyg [Nova Cyg 2007] [Correction]

March 19, 2007

This is a correction to Special Notice #38. I can't type.

Special Notice #37 announced the discovery of a possible nova [Nova Cyg 2007] in Cygnus by A. Tago (CBET 890). The coordinates are:

RA 20:28:12.52 DEC +41:48:36.5 J2000

Special Notice #38: V2467 Cyg [Nova Cyg 2007]

March 19, 2007

Special Notice #37 announced the discovery of a possible nova in Cygnus by A. Tago (CBET 890). The coordinates are:

RA 20:28:12.52 DEC +41:48:36.5 J2000

Special Notice #37: Possible Nova in Cygnus [V2467 Cyg]

March 16, 2007

A. Tago reports (CBET 890) the discovery of a possible nova [V2467 Cyg] from CCD exposures taken on March 15. The position, from Bisei Spaceguard Center images, is

RA 20:28:12.52 DEC +41:48:36.5 J2000

The brightness is about V=6.7, and the region has considerable nebulosity. We will be posting a VSP finding chart for this object in the next day or so; until then, estimate the brightness relative to nearby Tycho stars. Submit your observations as 9999+99 Nova Cyg 2007

Arne Henden

Special Notice #36: Variable Star in Triangulum Australe (1612-60 VAR TRA 07)

March 8, 2007

A variable star has been discoved in TrA, according to the Central Bureau for Astronomical Telegrams (CBET No. 867, Daniel W. E. Green, ed.):

"C. Jacques, Belo Horizonte, Brazil, reports that C. Colesanti, E. Pimentel, T. Napoleao, and he have found a previously unknown variable star on CCD images obtained in the course of the Brazilian Supernovae Survey (cf. IAUC 8482). The new object is located at

R.A. = 16h20m50s.18, Decl. = -60d23'39".5 (equinox 2000.0).

Special Notice #35: Eclipse of HD74057

February 24, 2007

Don Davies discovered a 7th magnitude eclipsing binary (GSC 02484-00592, HD74057, VSX J084246.2+315145) in May, 2005, announced on our discussion group (posting 5/27/2005), and subsequently published in Peremennye Zvezdy:
http://www.astronet.ru/db/varstars/msg/1212913

The coordinates are
08:42:45.900 +31:51:41.00 J2000
and the approximate magnitude is V=7.18, with (B-V) = 0.56

Pages

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484