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News and Announcements

10 October Special Notice #299: Observations needed TODAY of SDSS J164248.52+134751.4

October 10, 2012: Dr. Boris Gaensicke (leader of the consortium observing CVs with the HST COS instrument; see AAVSO Alert Notice 471 and AAVSO Special Notice #297 for details and instructions) writes with an urgent message:
 
"STScI would like an update on SDSS J164248.52+134751.4 by ~16UT TODAY (2012 October 10), when the star is not easily visible for most of our observers. Any observations from Europe early this evening will be most welcome."

05 October Special Notice #298: Second set of HST COS CV targets announced

October 6, 2012:  Following on AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden, www.aavso.org/aavso-alert-notice-471), the second set of targets the HST COS (Cosmic Origins Spectrograph) will be observing has been announced.
 

05 October Special Notice #297: HST COS observations of SDSS J164248.52+134751.4 scheduled

October 5, 2012:  Following on AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden, www.aavso.org/aavso-alert-notice-471), the HST COS (Cosmic Origins Spectrograph) far ultraviolet observations of the cataclysmic variable SDSS J164248.52+134751.4 have been scheduled for 2012 October 12 from 01:03:27 to 06:21:43 UT.

05 October Annual Report for 2010-2011 is published

The AAVSO Annual Report for FY 2010-2011 is now available online.

http://www.aavso.org/annual-report

28 September Charts and Sequences Updates September 2012

The latest release of APASS has allowed us to create new sequences and improve older sequences for hundreds of stars.

If you would like to request a new comparison star sequence for a star that currently does not have one please see the instructions for doing so located here.

If you find an error or have issues with an existing sequence, please submit those to CHET.

20 September Alert Notice 471: Cataclysmic variables to be monitored for HST observations

September 20, 2012: Drs.

20 September Special Notice #296: Outburst of the BL Lac object 4C 11.69 == CTA 102

October 6, 2012:  The BL Lac object 4C 11.69 (== CTA 102) was discovered in bright outburst by V. Larionov, D. Blinov, and S. Jorstad (St.

20 September Alert Notice 470: Symbiotic variable V4018 Sgr in outburst

September 20, 2012:  The symbiotic variable V4018 Sgr is undergoing an outburst, according to observations reported to the AAVSO and confirmed by spectroscopy by Ulisse Munari et al. Prompted by an observation and comment from John Bortle (Stormville, NY) (16 June 2012, visual magnitude 12.2) about a possible outburst, Steven O'Connor (St. George's, Bermuda) obtained an observation (10 August 2012, 11.44V) that confirmed V4018 Sgr was bright.

18 September Special Notice #295: Bright outburst of the BL Lac object PKS 0716+71

September 18, 2012:  AAVSO observer Klaus Wenzel (Grossostheim, Germany) noted that the BL Lacertae object PKS 0716+71 (== S5 0716+714) is currently brighter than it has been in several years, being at magnitude 12.7 (visual) on 2012 September 13.1354 (JD 2456183.6354).  This AGN is highly variable on short timescales, but recent observations of this object indicate that it remains bright.

17 September Two new eJAAVSO preprints

ej212: "GEOS RR Lyrae Survey: Blazhko Period Measurement of Three RRab Stars—CX Lyrae, NU Aurigae, and VY Coronae Borealis" by P. de Ponthière et al.

www.aavso.org/ejaavso

 

epsilon Aurigae preprint: "V-band Light Curve Analysis of epsilon Aurigae During the 2009–2011 Eclipse" by T. Karlsson

www.aavso.org/eps-aur-abstract-karlsson

14 September Solar Bulletin - Volume 68, Number 8

The August 2012 Solar Bulletin is now available!

14 September New eJAAVSO: Is MP Geminorum an Eclipsing Binary With a Very Long Period?

ej211: "Is MP Geminorum an Eclipsing Binary With a Very Long Period?" by D. Böheme

www.aavso.org/ejaavso211

13 September New eJAAVSO: GSC 4552-1643: A W UMa System With Complete Eclipses

ej210: "GSC 4552-1643: A W UMa System With Complete Eclipses" by D. Terrell, J. Gross


www.aavso.org/ejaavso210

11 September Announcing the 2012 AAVSO Council Nominees

Please click on the names of the nominees to view their biographies.  All members will receive Council election ballots in the mail in early September.  Best of luck to all of our nominees!

11 September Special Notice #294: CH Cyg observing campaign continued through 2012

September 11, 2012:  As announced in AAVSO Alert Notice 454 (http://www.aavso.org/aavso-alert-notice-454) and updated in AAVSO Special Notices #267 and #268 (http://www.aavso.org/aavso-special-notice-267 and -268), Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) is carrying out a multiwavelength campaign on the symbiotic variable CH Cyg this year. The satellite observations have taken place, and Dr.

10 September Special Notice #293: S Dor campaign continued through 2012-2013 season

September 10, 2012:  Dr. Noel Richardson (Georgia State University) has requested that the observing campaign on the luminous blue variable prototype S Dor (AAVSO Alert Notice 453, AAVSO Special Notice #280) be continued through the 2012-2013 observing season.

25 August Alert Notice 469: Observations of TT Ari requested in support of MOST observations

August 25, 2012: Dr. Nikolaus Vogt (Universidad de Valparaiso, Chile) has requested photometry and spectroscopy of the novalike (VY Scl subtype) cataclysmic variable TT Ari in support of upcoming observations with the Canadian Microvariability and Oscillations of Stars (MOST) satellite.

21 August Alert Notice 468: Observing campaign on V380 Oph cancelled

August 21, 2012: The observing campaign on V380 Oph announced in AAVSO Alert Notice 466 (www.aavso.org/aavso-alert-notice-466) has been cancelled at the request of the principal investigators, Drs. Joseph Patterson and Arne Henden.

21 August JAAVSO 100th Anniversary Issue is Published!

The special 100th anniversary issue of the Journal of the AAVSO is published as Volume 40, Number 1, Parts A and B.

Go to the issue's webpage: www.aavso.org/jaavso-v40n1 to view the abstracts and articles, to download the issue (members only), and to purchase printed copies.

If you would like to receive an email each time a new issue of the JAAVSO is posted, please visit this forum thread.

17 August Alert Notice 467: Nova Monocerotis 2012 = PNV J06393874+0553520

August 17, 2012: Discovered by: Shigehisa Fujikawa (Kanonji City, Kagawa Prefecture, Japan, reported by Mitsuru Soma, National Astronomical Observatory of Japan)

Discovery Magnitude: magnitude 9.4 C using a 105mm camera lens+CCD

Discovery date: 2012 Aug. 09.8048 UT

Coordinates: 06 39 38.74 +05 53 52.0 (2000.0)

14 August Solar Bulletin - Volume 68, Number 7

The July 2012 Solar Bulletin is now available!

12 August Alert Notice 466: Monitoring of V380 Oph requested in support of HST observations

THIS CAMPAIGN HAS BEEN CANCELLED. SEE AAVSO ALERT NOTICE 468 FOR DETAILS.  August 21, 2012

06 August Charts and Sequences Update August 2012

The latest release of APASS has allowed us to create new sequences and improve older sequences for hundreds of stars.

If you would like to request a new comparison star sequence for a star that currently does not have one please see the instructions for doing so located here.

05 August Special Notice #292: Possible nova in Carina = PNV J09410000-5759540

August 5, 2012: N. J. Brown (Two Rocks, W. Australia) reported a possible nova in Carina to the IAU CBAT with an observation of magnitude 9.5 photographic made on 2012 July 24.68 UT. The object has been placed on the IAU CBAT TOCP page (http://www.cbat.eps.harvard.edu/unconf/tocp.html) and assigned the name PNV J09410000-5759540.

03 August CHOICE Courses: Open for Registration!

The next round of CHOICE courses are open for registration.

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