AAVSO International Database

Alert Notice 400: Nova Sagittarii 2009 Number 3

August 8, 2009
 

Event: Nova in Sagittarius          [V5583 Sgr]

Discovered Independently By:
a. - Koichi Nishiyama, Kurume, Fukuoka-ken, Japan, and Fujio Kabashima, Miyaki-cho, Saga-ken, Japan
b. - Grzegorz Pojmanski, Dorota Szczygiel, and Bogumil Pilecki, Warsaw University Astronomical Observatory, observed by ASAS3

Discovery Date:
a. - Aug. 6.494 and 6.495 UT, confirmed on five frames taken around Aug. 6.494
b. - Aug. 6.182 UT

Alert Notice 401: Monitoring of EX Hya and DQ Her

August 13, 2009
 

Kunegunda Belle, Don Hoard and Steve Howell are observing two cataclysmic variables with Spitzer during the next couple of weeks.  They request ground-based light curves spanning the observation intervals so that they can identify the state each variable is in during the Spitzer visits.

1. EX HYA (12:52:24.20, -29:14:56.0, AUID 000-BBT-323)

The observations for EX Hya are scheduled for:

2009-08-18  19:25:01.1 UT 3.6micron single exposure
2009-08-18  19:26:52.9 UT 4.5micron light curve

Alert Notice 403: Request for observations of V2105 Oph in support of HST observations

August 30, 2009

 

Dr. Brian Espey (Trinity College, Dublin, Ireland) has requested photoelectric photometry and bright star CCD photometry of the semiregular variable V2105 Oph beginning immediately.  These observations are in support of ultraviolet spectroscopy to be obtained with the Hubble Space Telescope on Wednesday, September 2, 2009.  Observations are requested to continue through Sunday, September 6, 2009.

Alert Notice 405: Request for observations of NSV 99 (khi Peg) in support of HST observations

October 2, 2009
 

Dr. Brian Espey (Trinity College, Dublin, Ireland) has requested photoelectric photometry and bright star CCD photometry of the semiregular variable NSV 99 (= khi Peg) beginning immediately.  These observations are in support of ultraviolet spectroscopy to be obtained with the Hubble Space Telescope in late October and late November 2009. Observations are requested to continue through the end of November 2009.

Alert Notice 406: Observing Campaign to Monitor Magnetically-Active Dwarfs for Long-Term Variability

October 7, 2009
 

The observers of the AAVSO are asked to participate in a long-term photometric monitoring campaign on a number of magnetically active dwarf stars, requested by Dr. Styliani (Stella) Kafka of the Department of Terrestrial Magnetism, Carnegie Institute of Washington.  She requests long-term monitoring of these targets with an observing frequency of one observation every three days taken with one or more filters.

Alert Notice 407: Outburst of the UGWZ-type dwarf nova EG Cancri

October 12, 2009
 

The WZ Sge-type dwarf nova EG Cancri has been reported in outburst by Ian Miller (Swansea, Wales).  He reported EG Cnc at m(CV) = 14.3 on 2009 October 12.138 (JD 2455116.638).  Subsequent unfiltered time series observations by Miller reported to the AAVSO confirm EG Cnc at around magnitude 14.3; the star declined by approximately 0.1 magnitudes during the two-hour span of the time series.  Observations of EG Cnc are urgently requested at this time, including visual estimates, CCD photometry, and CCD time-series observations.

Special Notice #374: Possible Nova in Aquila = PNV J19023335+0315190 [V1830 Aql]

October 28, 2013:

Koichi Itagaki (Yamagata, Japan) reports (via the TOCP page and [vsnet-alert]) his discovery of a possible nova in Aquila [V1830 Aql]:

R.A. 19h02m33.35s, Decl. +03o15'19.0" (J2000.0)

2013 Oct. 28.4571 UT, 13.8 mag (unfiltered)

Special Notice #373: Comparison star changed for HD 15407A

October 24, 2013: HD 15407A is one of the targets in the current observing campaign by Huan Meng and Dr. George Rieke (runs through December 2013; see AAVSO Alert Notice 482). The very nearby star marked 96 (HD 15407B, AUID 000-BKY-170) was selected as the comparison star for this target. However, it has been found that the published magnitude of this star is questionable, and the astronomers have withdrawn it as the comparison.