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News and Announcements

02 February Special Notice #330: Next HST/COS targets are IR Com and BB Dor

February 2, 2013:  Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471), the next HST/COS target is the SU UMa-type dwarf nova IR Com. HST/COS observations are scheduled for:

     IR Com   2013 February 8 00:38:46 through 05:57:49 UT

29 January Special Notice #329: Critical time for CV Campaign HST/COS target SDSS J100515.38+191107.9

January 29, 2013:  SDSS J100515.38+191107.9 is the upcoming target for the HST/COS CV Campaign (see AAVSO Alert Notice 471 and AAVSO Observing Campaigns page (http://www.aavso.org/observing-campaigns) for details and related Special Notices). Dr. Gaensicke writes:

"We are now entering the critical phase before the HST observations of SDSS1005+1911, scheduled for

29 January Special Notice #328: HST/COS observing U Gem 2013 January 30

January 29, 2013: Further to AAVSO Alert Notice 475 (http://www.aavso.org/aavso-alert-notice-475) and AAVSO Special Notice #327 (http://www.aavso.org/aavso-special-notice-327), HST/COS will be observing the dwarf nova U Gem on

                                        2013 January 30 21:31:12 - 23:36:16 UT

24 January Special Notice #327: HST/COS observations scheduled for U Gem

January 24, 2013:  Further to AAVSO Alert Notice 475 (http://www.aavso.org/aavso-alert-notice-475),  HST/COS observations of U Gem have been scheduled for  2013 January 30 21:31:12 - 23:36:16 UT.

24 January Special Notice #326: Next HST/COS target is SDSS J100515.38+191107.9

January 24, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471), the next HST COS target is the SU UMa-type dwarf nova SDSS J100515.38+191107.9. HST COS is scheduled to observe it:

23 January 2013 Eclipsing Binary Ephemeris online

The Eclipsing Binary ephemeris for 2013, prepared by Gerry Samolyk, is on the AAVSO website at

http://www.aavso.org/eclipsing-binary-ephemerides

21 January Special Notice #325: BB Dor monitoring requested for Swift and HST observations

January 21, 2013: AAVSO observations are requested of the SW Sex-type novalike variable BB Dor in support of one and possibly two sets of multiwavelength observations: Dr. Tomohito Ohshima (Department of Astronomy, Kyoto University) and colleagues have triggered Target of Opportunity observations with NASA's Swift gamma-ray burst satellite, and Dr. Boris Gaensicke (Warwick University) is hoping to observe BB Dor in the ultraviolet with HST.

21 January Special Notice #324: LT Eri (SDSS J040714.78-064425.1) is next HST COS target

January 21, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #309 (http://www.aavso.org/aavso-special-notice-309), the next HST COS target is the dwarf nova LT Eri (SDSS J040714.78-064425.1). HST COS is scheduled to observe it:

17 January The AAVSO Newsletter - January 2013 - is published

AAVSO Newsletter 55 - January 2013


http://www.aavso.org/aavso-newsletter

16 January Alert Notice 478: Transformed photometry of young stars in Cha requested

January 16, 2013: Dr. Péter Ábrahám (Konkoly Observatory, Budapest, Hungary) has requested the assistance of AAVSO observers in monitoring eight young stars in Chamaeleon in support of photometry he and his colleagues will be obtaining with the VLT/ISAAC (infrared) and Herschel Space Observatory (far-infrared) during January-February 2013.

15 January Solar Bulletin - Volume 68, Number 12

The December 2012 Solar Bulletin is now available!

14 January Special Notice #323: Observations of BB Dor requested

January 14, 2013: Dr. Boris Gaensicke (Warwick University), who is the coordinating PI on the large observing campaign underway to observe cataclysmic variables with the HST Cosmic Origins Spectrograph (see AAVSO Alert Notice 471 and follow-up AAVSO Special Notices as listed on the AAVSO Observing Campaigns page), is requesting observations tonight and over the next few nights of the novalike variable BB Dor.

14 January Special Notice #322: CU Vel is next HST COS target

January 14, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #309 (http://www.aavso.org/aavso-special-notice-309), the next HST COS target is the classic SU UMa-type dwarf nova CU Vel. HST COS is scheduled to observe it:

10 January Special Notice #321: Observations critical tonight for SDSS J093249.57+472523.0

January 10, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #319 (http://www.aavso.org/aavso-special-notice-319), tonight's observations of SDSS J093249.57+472523.0 will be critical, as sometime tomorrow (January 11) the scheduling team will make the final decison about going ahead with the HST COS observations planned for

09 January Alert Notice 477: Supernova 2013E in IC 2532 = PSN J10000552-3414013

January 9, 2013

Event: Supernova 2013E in IC 2532 = PSN J10000552-3414013

Discovered by: Stuart Parker (Canterbury, New Zealand)

Discovery Date: 2013 Jan. 4.58 UT

Discovery Magnitude: red mag 14.8 on a 30-s unfiltered CCD image taken with a 30-cm Astro-Tech AT12RC Ritchey-Chretien astrograph (+ ST10 camera) at his Parkdale Observatory in the course of the Backyard Observatory Supernova Search (BOSS)

09 January Special Notice #320: CH Cygni monitoring campaign continues

January 9, 2013: Further to AAVSO Alert Notice 454 (http://www.aavso.org/aavso-alert-notice-454) and AAVSO Special Notices #267, #268, and #294 (http://www.aavso.org/aavso-special-notice-267, -268, -294), Dr.

04 January Alert Notice 476: Multicolor photometry of triple system b Per requested

January 4, 2013: Dr. Bob Zavala (U.S. Naval Observatory, Flagstaff) has requested AAVSO assistance in obtaining multicolor photometry of the bright triple system b Per in order to prepare for and detect a possible eclipse of the AB components by the C component predicted for 2013 January 23. At 4.5V, b Per, which is also a radio source, is an excellent target for photoelectric photometrists and DSLR observers.

04 January Special Notice #319: HST COS observing SDSS J093249.57+472523.0 2013 January 11-12

January 4, 2013: Further to AAVSO Alert Notice 471 (www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #317 (www.aavso.org/aavso-special-notice-317), HST COS is scheduled to observe the U Gem-type cataclysmic variable

03 January Paper copies of JAAVSO 40.2 (epsilon Aur) are now available

Printed copies of the epsilon Aurigae special edition of JAAVSO (vol. 40, nr. 2, 2012) are now available.

Buy a paper copy from createspace.com for $13 plus shipping.

Or, go to the JAAVSO 40.2 page using the link below, then click on the createspace.com link

http://www.aavso.org/jaavso-v40n2

23 December Special Notice #318: SN 2012hr, a Type Ia supernova prior to maximum

December 23, 2012: SN 2012hr was discovered by Peter Marples (Loganholme, QLD, Australia, Backyard Observatory Supernova Search (BOSS)) [not by Colin Drescher (Calamvale, QLD, Australia; BOSS) as originally reported in AAVSO Special Notice #318; Drescher reported Marples' discovery to CBAT as announced in CBET 3346] on 2012 December 16.53.  The object was discovered at a red magnitude of 14.8.  Subsequent spectroscopy by Milisavljevic et al. and Morrell et al.

22 December Alert Notice 475: Monitoring of the dwarf nova U Geminorum in support of HST observations

December 22, 2012: As announced by Dr. Matthew Templeton (AAVSO) in AAVSO Special Notice #316 (www.aavso.org/aavso-special-notice-316), Dr.

21 December JAAVSO special epsilon Aurigae issue is published!

The special epsilon Aurigae issue of the Journal of the AAVSO is published as Volume 40, Number 2.

Go to the issue's webpage: www.aavso.org/jaavso-v40n2 to view the abstracts and articles, to download the issue (members only), and to purchase printed copies (printed copies are expected to be available by the end of the month).

20 December Special Notice #317: HST COS observing HS 0218+3229 2012 December 22 and SDSS J093249.57+472523.0 is probable next target

December 20, 2012: Further to AAVSO Alert Notice 471 (www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #315 (www.aavso.org/aavso-special-notice-309), HST COS is scheduled to observe the U Gem-type cataclysmic variable HS 0218+3229 on December 22:

20 December Charts and Sequences Update December 2012

The following charts (listed in order by constellation) have new or revised sequences since September 28, 2012. This list is quite long and includes all the stars in the new Binocular Program. 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.

18 December Solar Bulletin - Volume 68, Number 11

The November 2012 Solar Bulletin is now available!

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