News and Announcements
|19 December||Charts and Sequences Update December 19, 2013||
The list below are stars whose sequences have been created or revised since October 8, 2013. If you currently observe any of these stars, please update your charts to the latest version of the sequence.
You can also check the list for all of 2013 and previous years here.
|19 December||Special Notice #379: Supernova 2013hn in IC 4329 = PSN J13485917-3017265||
December 19, 2013: IAU CBET 3762 (Daniel W. E. Green, Ed.) announces the discovery of Supernova 2013hn in IC 4329 by Ella Sanders Kot and R. Kot (Truth or Consequences, NM) and D. Coffin (University of Iowa) at unfiltered magnitude 15.2 on 2013 December 13.544 UT using the 0.37-m f/14 Rigel telescope at the Iowa Robotic Observatory near Sonoita, AZ. E. S. Kot adds that a follow-up image taken on December 16.53 shows SN 2013hn at mag 14.8 U (position end figures 59.19s, 26.9").
|19 December||Alert Notice 494: T Tauri stars observing campaign||
December 19, 2013: Darryl Sergison (University of Exeter) has requested AAVSO assistance with a campaign he is carrying out on five T Tauri stars. This study is the one for which AAVSO observers carried out a preliminary campaign last year (see Alert Notice 473 and Special Notice #306). The star list is revised and expanded from last year's list of targets. This campaign will run from now at least through the end of the 2013-2014 observing season.
|18 December||Solar Bulletin - Volume 69, Number 11||
The November 2013 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
|18 December||Special Notice #378: BP Tau Chandra observation times set - time-series observations needed||
December 18, 2013: Further to AAVSO Alert Notice 493, Dr. Hans Moritz Guenther (Harvard-Smithsonian Center for Astrophysics) has been given the precise times of the Chandra X-ray observations to be made of the T Tauri star BP Tau:
|18 December||Alert Notice 493: Request to monitor BP Tau in support of Chandra X-ray observations||
December 18, 2013: Dr. Hans Moritz Guenther (Harvard-Smithsonian Center for Astrophysics) has requested nightly observations of the classical T Tauri star BP Tau in support of upcoming Chandra X-ray observations in his study of the accretion processes underway in this star.
|16 December||JAAVSO vol 41, no 2 is now published||
JAAVSO Volume 41, Number 2 is now published
|06 December||New eJAAVSO preprint: The naked-eye optical transient OT 120926||
ej251: "The Naked-eye Optical Transient OT 120926" by Y. Zhao, P. B. Hall, P. Delaney, J. Sandal
|06 December||Special Notice #377: Reported outburst of the WZ Sge star AL Comae||
December 6, 2013: Observer Carlo Gualdoni reports via the cvnet-outburst mailing list that the WZ Sge-type dwarf nova AL Comae is in outburst, with a magnitude of V=12.74 on 2013 December 6.185 (JD 2456633.1185). Gary Poyner notes on the BAAVSS mailing list that this is the first observed outburst of AL Com since October 2007. Both visual observations and CCD time series are encouraged.
|05 December||Admin Assistant Opening at AAVSO HQ||
When Lauren Rosenbaum came to work with us as the AAVSO HQ Admin Assistant we knew it would be for a limited number of years while she attended graduate school. Wow, has the time flown by!!! In her time with us Lauren has become a crucial member of the AAVSO family. We will be so very sad to see her go, but she will be leaving us to take the next step in her career. We all wish her the very best!
|03 December||Alert Notice 492: Nova Centauri 2013 = PNV J13544700-5909080||
December 3, 2013
|02 December||Special Notice #376: HST observations of U Gem scheduled for December 6||
December 2, 2013: Further to AAVSO Special Notice #318 (M. Templeton) and AAVSO Alert Notice 475 (E. Waagen), Dr. Michael Shara (American Museum of Natural History) informs us that HST/COS observations of the dwarf nova U Gem have been scheduled for 2013 December 6 UT (one day earlier than originally indicated in the December 2 posting to the AAVSO forums). The observations will take place:
|02 December||Alert Notice 491: V556 Serpentis = Nova Ser 2013 = PNV J18090346-1112345||
December 2, 2013
|26 November||Two new eJAAVSO preprints: Monitoring solar activity trends; Maxima and O–C diagrams for 489 Mira stars||
ejaavso 250: "Monitoring Solar Activity Trends With a Simple Sunspotter" by K. Larsen
ejaavso 251: "Maxima and O–C Diagrams for 489 Mira Stars" by T. Karlsson
|25 November||NEW! The Annual Adopt A Variable Star Program||
We are excited to bring you a new fundraising program designed to encourage small donations to the AAVSO from a large number of donors each year. The concept is very simple and has been used by other non-profits to raise money for children, animals, and other good causes.
|22 November||Two new eJAAVSO preprints: UV-B and B optical flare search; 18 new variables in Cas||
ejaavso 248: "UV–B and B-band Optical Flare Search in AR Lacertae, II Pegasi, and UX Arietis Star Systems" by G. A. Vander Haagen
ejaavso 249: "Eighteen New Variable Stars in Cassiopeia and Variability Checking for NSV 364" by R. Furgoni
|15 November||Solar Bulletin - Volume 69, Number 10||
The October 2013 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
|15 November||New eJAAVSO preprint: Recent Minima of 199 Eclipsing Binary Stars||
ejaavso 247: "Recent Minima of 199 Eclipsing Binary Stars" by G. Samolyk
|13 November||Special Notice #375: Symbiotic variable AS 270 in outburst||
November 13, 2013: The symbiotic star AS 270 is in outburst, according to observations reported to vsnet-alert by Berto Monard (MLF; Calitzdorp, South Africa) and to the AAVSO International Database (AID) by Steve O'Connor (OCN; St. George's, Bermuda). O'Connor reports the star at V=11.72 +/-0.03 on 2013 November 13.405 UT (JD 2456609.905), well above its normal minimum magnitude of 14.2V.
|04 November||New eJAAVSO preprint: Book Review: The Life and Death of Stars (Lang)||
ejaavso 246: "Book Review: The Life and Death of Stars (Lang)" by J. B. Lester
|28 October||Special Notice #374: Possible Nova in Aquila = PNV J19023335+0315190||
October 28, 2013: Koichi Itagaki (Yamagata, Japan) reports (via the TOCP page and [vsnet-alert]) his discovery of a possible nova in Aquila:
R.A. 19h02m33.35s, Decl. +03o15'19.0" (J2000.0)
2013 Oct. 28.4571 UT, 13.8 mag (unfiltered)
|28 October||Help us pick the dates for the 2014 AAVSO CCD School!||
Please take a moment to help us pick the dates for the 2014 AAVSO CCD school. We are currently considering all weeks in July and August. If you are interested in participating in the week-long CCD School in 2014, we ask that you complete the scheduling survey. We will use the results of the survey to help us select the best week for the school.
|24 October||Special Notice #373: Comparison star changed for HD 15407A||
October 24, 2013: HD 15407A is one of the targets in the current observing campaign by Huan Meng and Dr. George Rieke (runs through December 2013; see AAVSO Alert Notice 482). The very nearby star marked 96 (HD 15407B, AUID 000-BKY-170) was selected as the comparison star for this target. However, it has been found that the published magnitude of this star is questionable, and the astronomers have withdrawn it as the comparison.
|22 October||New eJAAVSO preprint: Book review: Meeting Venus (Sterken and Aspaas, eds.)||
ejaavso 245: "Meeting Venus—a Collection of Papers Presented at the Venus Transit Conference, Tromsø 2012" (Sterken and Aspaas, eds.), by J. R. Percy
|15 October||Solar Bulletin - Volume 69, Number 9||
The September 2013 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin