News and Announcements
|09 April||Special Notice #347: Correction to AAVSO Special Notice #346||
April 9, 2013: In AAVSO Special Notice #346 (http://www.aavso.org/aavso-special-notice-346), IU Leo was said to have a close companion about 2 arcsec to the NE. This is not correct - it is IY UMa that has this close companion.
|08 April||Special Notice #346: RZ Leo observations critical now for HST/COS and IU Leo next target||
April 8, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #345 (http://www.aavso.org/aavso-special-notice-345), HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova RZ Leo:
|04 April||Charts and Sequences Update April 2013||
The following charts (listed in order by constellation) have new or revised sequences since December 20, 2012. This list is quite long. A .csv file is available as an attachment here at the bottom of the page as well.
If you observe any of these stars please update your charts as soon as possible.
|03 April||102nd Spring Meeting of the AAVSO||
AAVSO 102nd Spring Meeting was held at Appalachian State University in Boone, NC.
|03 April||Alert Notice 482: Monitoring requested for dust production study in developing planetary systems||
April 4, 2013: Huan Meng and Dr. George Rieke (University of Arizona) have requested AAVSO assistance in monitoring three bright stars with developing planetary systems. The stars have been observed with NASA's Spitzer Space Telescope to have varying levels of dust in the circumstellar disk. These varying levels are thought to be produced through collisions among the asteroid-size debris in the disk.
|02 April||Special Notice #345: MR UMa observations needed now and RZ Leo next HST/COS target||
April 2, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #344 (http://www.aavso.org/aavso-special-notice-344), HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova MR UMa:
|27 March||AAVSO Solar Bulletin 1945-1953||
Scanned copies of the AAVSO Solar Bulletin Vol. 1 (1945) through Vol. 9 (1953) are now online. These first nine volumes were edited and produced by the first Solar Division Chairman, Neal J. Heines (1892-1955).
Our thanks to volunteer Anna Hillier for making these scans at AAVSO Headquarters.
|25 March||Special Notice #344: IY UMa and MR UMa next HST/COS targets||
March 25, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #342 (http://www.aavso.org/aavso-special-notice-342), HST/COS is scheduled to observe the eclipsing SU UMa-type dwarf nova IY UMa:
|19 March||Alert Notice 481: Nova Survey participation requested||
March 19, 2013: The AAVSO solicits participation in an online survey from our member and observer communities. The survey is being conducted in advance of an upcoming long-term observing campaign that will be launched in mid-April 2013. We are seeking participation in this survey from as broad a sample of the AAVSO community as possible, and your responses will help us gauge the effectiveness of the campaign and serve the observer community better.
|18 March||Special Notice #343: GK Per outburst appears to be underway||
March 18, 2013: The old nova GK Per (N Per 1901), which has dwarf nova outbursts, appears to be going into outburst, according to observations submitted to the AAVSO International Database:
|18 March||Special Notice #342: PU CMa, then IY UMa and MR UMa next HST/COS targets||
March 18, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471), HST/COS is scheduled to observe the SU UMa-type dwarf nova PU CMa:
|18 March||New CHOICE Courses: Final days of registration!||
Our two new CHOICE courses begin today. There is still time to register just under the wire!
"Visual Observing Basics" and "CCD Photometry, Part One" will both will run March 18 through April 12, 2013. Visit the CHOICE homepage for more details and the registration link!
|14 March||Special Notice #341: V485 Cen observations crucial tonight through Sunday night||
March 14, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #340 (http://www.aavso.org/aavso-special-notice-340), HST/COS is scheduled to observe the dwarf nova V485 Cen on 2013 March 16:
|13 March||Solar Bulletin - Volume 69, Number 2||
The February 2013 Solar Bulletin is now available.
|12 March||Manual for Visual Observing of Variable Stars - update||
The Manual for Visual Observing of Variable Stars (in English) has just been updated. To download this new and improved version, please visit http://www.aavso.org/visual-observing-manual.
Many thanks to Mike Simonsen, Elizabeth Waagen and Matthew Templeton for their input and helpful suggestions.
|08 March||Alert Notice #480: MR UMa superoutburst coverage requested for HST observations||
March 8, 2013: Dr. Boris Gaensicke (Warwick University) has requested observations of the currently-outbursting SU UMa-type cataclysmic variable MR UMa in preparation for and support of HST observations scheduled for the week 2013 April 4-7.
|06 March||Special Notice #340: HST/COS observations 2013 March 8 and March 9||
March 6, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #339 (http://www.aavso.org/aavso-special-notice-339), HST/COS is scheduled to observe two of the dwarf novae in the CV campaign back-to-back:
|28 February||Special Notice #339: V406 Vir (SDSS J123813.73-033932.9) HST/COS observations early tomorrow||
February 28, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #338 (http://www.aavso.org/aavso-special-notice-338), HST/COS is scheduled to observe V406 Vir (SDSS J123813.73-033932.9) tomorrow:
|27 February||Bulletin 76 for 2013 published and available online||
AAVSO Bulletin 76 - Predicted Dates of Maxima and Minima of Long Period Variables for 2013 - has been published and is available from the AAVSO Bulletin page.
AAVSO Bulletin 76 gives predicted dates for 381 Mira and semiregular variables for the period January 2013 through February 2014. These dates are based on observations in the AAVSO International Database.
|26 February||ASP 125th Annual Meeting||
The Astronomical Society of the Pacific (ASP) will hold its 125th Annual Meeting on "Ensuring STEM Literacy" in San Jose, CA from July 20 to July 24, 2013. Early bird registration has begun and abstracts are currently being accepted. Please visit the ASP meeting page for more information.
|24 February||Professional Astronomers: Invitation to Participate in an AAVSO Survey||
The American Association of Variable Star Observers (AAVSO) invites the participation of professional astronomers in our "Professional Astronomer Survey of 2013."
|21 February||Special Notice #338: HM Leo HST/COS observations tomorrow; V406 Vir is next target||
February 21, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #336 (http://www.aavso.org/aavso-special-notice-336), HST/COS is scheduled to observe HM Leo tomorrow:
|18 February||Solar Bulletin - Volume 69, Number 1||
The January 2013 Solar Bulletin is now available.
|17 February||Alert Notice 479: Supernova 2013aa in NGC 5643 = PSN J14323388-4413278||
February 17, 2013
|17 February||Aviso Especial de AAVSO #337 (actualizado): supernova brillante de tipo Ia en la galaxia NGC 5643 (Lupus)||
17 de febrero de 2013: Stuart Parker (Canterbury, Nueva Zelanda), del equipo BOSS, ha descubierto una brillante supernova en la galaxia espiral NGC 5643 en la constelación de Lupus.