News and Announcements
|26 February||AAVSO Bulletin 78 for 2015 published||
AAVSO Bulletin 78 - Predicted Dates of Maxima and Minima of 380 Long Period Variables for 2015 has been published.
The Bulletin is an essential aid in planning your LPV observing program! Generate a custom version of the Bulletin tailored to your observing needs, or download the Bulletin in PDF or CSV format. Find a list of legacy LPVs in need of observation here as well.
|26 February||Landolt Standards and 21st Century Photometry||
Arlo Landolt should be familiar to most of the AAVSO community, not only as a friend and former councillor of the AAVSO, but as one of the leading figures of astronomical photometry and photometric calibrations. Arlo Landolt's work on standard stars has set the standard -- very literally -- for astronomical photometry for nearly half a century.
|18 February||Alert Notice 509: Nova Sagittarii 2015 = PNV J18142514-2554343||
February 18, 2015
Event: Nova Sagittarii 2015 = PNV J18142514-2554343
Discovered independently by:
|17 February||Alert Notice 508: Nova Scorpii 2015 == PNV J17032620-3504140||
February 17, 2015
Event: Nova Scorpii 2015 = PNV J17032620-3504140
Discovered by: Tadashi Kojima, Gunma-ken, Japan
Discovery magnitude: unfiltered DSLR magnitude 8.1, using a 150-mm f/2.8 lens and digital camera
Discovery date: 2015 February 11.837 UT
Coordinates: RA: 17 03 26.18 , Decl: -35 04 17.6
|13 February||Special Notice #398: Bright Transient in Sgr (PNV J18142514-2554343)||
Patrick Schmeer (SPK, Bischmisheim, Germany) reports the announcement on the CBAT Transient Object Confirmation Page (TOCP) of the discovery of a bright transient in Sgr on 2015 February 12.852 at an unfiltered magnitude of 10.9 by K. Nishiyama, using a 105-mm f/4 camera lens with an SBIG STL6303E CCD camera. Nishiyama notes nothing is present on a previous image from 2015 February 02.887. The transient has been independently confirmed with two pre-discovery images: by H. Nishimura (Shizuoka-ken, Japan) at magnitude 11.2 on 2015 February 12.840, and by T.
|12 February||CCD Photometry Guide update||
The AAVSO Guide to CCD Photometry version 1.1 is now available for download.
This version contains several corrections and clarifications based on feedback from Ken Menzies and Tim Crawford. Thanks you two!
If you have comments or find inconsistencies, please send them to me and we will consider them for inclusion in the next revision.
Sara Beck, AAVSO Technical Assistant (firstname.lastname@example.org)
|12 February||Special Notice #397: Bright Transient in Sco (PNV J17032620-3504140)||
February 11, 2015: Patrick Schmeer (SPK, Bischmisheim, Germany) reports the announcement on the CBAT Transient Object Confirmation Page (TOCP) of the discovery of a bright transient in Sco on 2015 February 11.8367 UT at unfiltered CCD magnitude 8.2 by Tadashi Kojima (Gunma-ken, Japan) using a 150-mm f/2.8 lens + a digital camera. Kojima reports nothing is visible on a frame from the same camera on Feb. 10.827 UT.
|09 February||Campaign highlight: b Persei||
Some of the best opportunities for contributing to astronomical research come through the AAVSO's Observing Campaigns, which are observing projects requested by individual researchers with a specific goal in mind. Some Campaigns are designed to last for a long time, and the results aren't known until well after the campaign concludes. But some campaigns pay off immediately. Our campaign on the bright star b Persei is an example of the latter, with a handful of AAVSO observers getting exactly the right data, at the right time, right away!
|23 January||Charts and Sequences Update January 2015||
With APASS data release 8 filling in most of the remaining areas of sky with reliable secondary standards, the sequence team has been busy filling the remaining standing requests. This latest batch of new and revised sequences also has many newly discovered CVs from ASASSN, as well as sequences for RCB, NR and ZAND objects in the AID and VSX. You can downoad the list as either an .xlsx or .csv file.
|21 January||AAVSO Newsletter for January 2015 is published||
AAVSO Newsletter 63, January 2015 is now available to members
The AAVSO Newsletter is a periodic, general forum that supports our various observing programs with lists of new targets, observing programming ideas, and general information that spans a wide area of interest. Guest writers contribute pieces that can range from current events to book reviews.
|20 January||New eJAAVSO preprint: An eclipsing symbiotic nova in outburst?||
The Curious Case of ASAS J174600-2321.3: an Eclipsing Symbiotic Nova in Outburst?
|19 January||Special Notice #396: Blazar PKS 0716+71 in very bright outburst||
January 19, 2015: The blazar PKS 0716+71 == S5 0716+71 is currently in a very bright active state, at a visual magnitude of 12.1 as observed by G. Poyner on 2015 January 19.212 (JD 2457041.712). The object was first noted in outburst by Arkharov et al.
|19 January||Two new eJAAVSO preprints: Maxima of 67 SPPs; Longterm monitoring of semiregulars||
Recent Maxima of 67 Short Period Pulsating Stars
P.O. Box 20677, Greenfield, WI 53220
Received January 8, 2015; accepted January 8, 2015
|16 January||Special Notice #395: Alpha Com campaign cancelled||
January 16, 2015: We have been informed by PI Dr. Matthew Muterspaugh that his campaign on alpha Com (AAVSO Alert Notice 506) has been cancelled. Position measurements published a century ago contained errors that affected the predictions for the time of eclipse.
More information will be coming from Dr. Muterspaugh and we will disseminate it to everyone in an Alert Notice, but he asked that the observer community be informed now so that observing efforts might not be wasted.
|14 January||Solar Bulletin - Volume 70, Number 12||
The December 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
|14 January||New eJAAVSO preprint: Revised elements of 78 southern EB systems||
Revised Light Elements of 78 Southern Eclipsing Binary Systems
Margaret Streamer, Jeff Byron, David J. W. Moriarty, Tom Richards, Bill Allen, Roy Axelsen, Col Bembrick, Mark Blackford, Terry Bohlsen, David Herald, Roland Idaczyk, Stephen Kerr, Ranald McIntosh, Yenal Ogmen, Jonathan Powles, Peter Starr, George Stockham
|12 January||Special Notice #394: Observations of b Persei urgently requested||
January 12, 2015: Photometry by P. Benni (AAVSO observer code BPAD; Massachusetts, United States), D. Collins (CDK; North Carolina, United States), F. Campos (CFRA; Catalunya, Spain), and F. Melillo (MFR; New York, United States) suggest that b Persei may have entered eclipse around JD 2457033.6 (2015 January 11.1 UT). Time-series photometric observations of this bright star are urgently requested beginning immediately, and continuing for the next two weeks (through at least 2015 January 26 UT) and possibly beyond.
|07 January||JAAVSO Vol. 42, No. 2, 2014 printed copies available||
Paper copy from createspace.com is available for $12 plus shipping.
|06 January||Alert Notice 507: Observations of the eclipsing binary b Persei||
January 7, 2015: Dr.
|04 January||2015 CHOICE Course Schedule||
|30 December||The last fundraising letter||
Dear AAVSO Supporters,
This is the last fundraising letter you will get from the AAVSO in 2014, I promise.
Solar Bulletin - Volume 70, Number 11
The November 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
|11 December||JAAVSO Vol. 42, No. 2, 2014 is published||
Journal of the American Association of Variable Star Observers
TABLE OF CONTENTS
Does the Period of a Pulsating Star Depend on its Amplitude?
|11 December||Special Notice #393: Correction to Special Notice #392 [ASASSN-14lp]||
December 11, 2014: In AAVSO Special Notice #392, the name of the supernova discovered in NGC 4666 was given as ASASSN-141p. It should have been ASASSN-14lp. That is to say, the text following the dash should
Please create charts and submit observations using the name ASASSN-14lp.
Sincere apologies for the error!
|11 December||Special Notice #392: ASASSN-14lp = Type Ia Supernova in NGC 4666 (Virgo)||
December 11, 2014: T. W.-S. Holoien et al. announce in The Astronomer's Telegram (ATel) #6795 (http://www.astronomerstelegram.org/?read=6795) the discovery of a transient in NGC 4666 at magnitude 14.3 V on 2014 December 9.61 UT. The discovery was made in the course of the All Sky Automated Survey for SuperNovae (ASASSN) search, and the object assigned the name ASASSN-14lp. ASASSN-14lp was not seen (<15.3 V) in poor-quality ASASSN images obtained on 2104 Dec. 08.35 UT.