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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:

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:

year:day:hour:min (in UT):
2013:356:22:52-2013:357:10:00 = 2013 Dec 22 22:52 through Dec 23 10:00 UT

2013:359:14:46-2013:360:06:06 = 2013 Dec 25 14:46 through Dec 26 06:06 UT

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!

This bittersweet news means that we have an opening at AAVSO HQ.  Please pass this job posting along to any local candidates.

03 December Alert Notice 492: Nova Centauri 2013 = PNV J13544700-5909080

December 3, 2013

Event: Nova in Centaurus = Nova Cen 2013 = PNV J13544700-5909080

Discovered by: John Seach (Chatsworth Island, NSW, Australia)

Discovery magnitude: unfiltered magnitude 5.5 using a DSLR with 50-mm lens

Discovery date: 2013 December 02.692 UT

Coordinates: R.A. 13 54 45.34   Decl. -59 09 04.2  (2000.0, K. Hornoch,

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

Event: V556 Serpentis = Nova Ser 2013 = PNV J18090346-1112345

Discovered by: Koichi Itagaki (Teppo-cho, Yamagata, Japan), reported by S. Nakano (Sumoto, Japan)

Discovery magnitude: unfiltered CCD magnitude mag 12.3, using a 0.21-m reflector

Discovery date: 2013 Nov. 24.384 UT

Coordinates: R.A. 18 09 03.46  Decl. -11 12 34.5  (2000.0)

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 The Annual Adopt A Variable Star Program

The Annual Adopt a Variable Star Program (AAVSP) is a 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:

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:

10 October New eJAAVSO preprint: Comments on the UBV Photometric System’s Defining Standard Stars

ej 244: "Comments on the UBV Photometric System’s Defining Standard Stars" by Arlo U. Landolt

Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803

09 October The 2013 AAVSO Fall Membership Meeting!

We will be webcasting the 2013 Fall Membership Meeting on Saturday, October 12th for those members and guests not able to make it to Woburn, MA this year.

You may log into the Webcast starting at 8.45ET (12.45UT). The actual meeting will start at 9.00ET (13.00UT).

Please register for AAVSO Fall Membership Meeting webcast at:

08 October Charts and Sequences Update October 2013

The following is a list of chats and sequences created, updated or revised since June 25, 2013. If you are observing any of these stars please check to be sure you are using the most recent version of the sequence.


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