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News and Announcements

16 July Alert Notice 422: Observing Campaign on Hubble's First Variable in M31: M31_V1

July 16, 2010: An observing campaign is being carried out on M31_V1, the first variable star discovered in M31 by Edwin Hubble. The Hubble Heritage Team, with Dr. Keith Noll, Space Telescope Science Institute (STScI), as Principal Investigator, plans to observe M31_V1 with the Hubble Space Telescope (HST), and needs to know the phase of this Cepheid variable. Although basic parameters are known for this star, no recent photometry exists, so observations are required to generate current phase information.

16 July Citizen Sky Planetarium Show w/Timothy Ferris

 Our Citizen Sky project has released a nice 7-minute planetarium trailer about Algol, eclipsing binary stars, epsilon Aurigae and more. It is narrated by Timothy Ferris and available on YouTube and also in hi-def and full-dome formats. 07/16/10

15 July AAVSO Newsletter #45

AAVSO Newsletter #45 has been posted. Check out articles about astronauts, challenges for visual observers, new articles for Eyepiece Views, reports from Galway astrofest and observing in Scotland, and much more.

13 July Astro Data Mining Blog

Dr. John Rachlin has launched a new blog highlighting resources useful for those interested in data mining astronomical databases. From his blog:

09 May Optical transient in Pegasus

09 May Possible Nova in Scorpius - N Sco 2010 No. 2

Central Bureau for Astronomical Telegrams CBET 2262 (Daniel W. E. Green, ed.) announces the discovery by Koichi Nishiyama, Kurume, Fukuoka-ken, Japan; and Fujio Kabashima, Miyaki-cho, Saga-ken, Japan, of a possible nova in Scorpius at magnitude 8.6 on two 40-s unfiltered CCD frames (limiting magnitude 13.1) taken around April 25.788 UT. They confirmed the new object on unfiltered CCD frames (limiting magnitude 17.3) taken around April 25.796 from which they measured the following precise position: R.A. = 16:55:13.16, Decl. = -38:03:46.9 (equinox 2000.0)

09 May Request for photometry of the dwarf nova SS Cygni

Further to AAVSO Special Notice 204 (2010 April 15), we are requesting additional observations of the bright dwarf nova SS Cygni currently in outburst. SS Cyg is currently beginning a dwarf nova outburst, and observations of this star made with the EVLA have detected the source at radio wavelengths. Observations of SS Cyg have been scheduled with the VLBA on 2010 April 22 and April 23. Continued optical monitoring of SS Cyg through the end of the current outburst is strongly encouraged, with intensive coverage requested during the VLBA observations.

09 May Rapid fading in the luminous blue variable S Doradus

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