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News and Announcements

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.


04 October AAVSO Newsletter, October 2013 is published

AAVSO Newsletter 58, October 2013, is now published:

01 October Special Notice #372: Probable new red variable IRAS 17378-3411 = PNV J17411305-3413235

October 1, 2013: Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan) report their discovery of a possible nova - which now appears to be a red variable - in Sco at unfiltered magnitude 11.1 on unfiltered CCD images taken 2013 Sep. 30.44605 UT. They confirmed their discovery on images taken around 2013 Sep 30.4621 UT. Nothing was seen down to magnitude 13.5 and 13.7 on images taken 2013 Jul 11.539 UT and 12.571 UT, respectively, or on DSS or USNO-B1.0 images. A check for minor planets was carried out.

27 September VStar User Manual

The VStar User Manual is now available for download! Thanks to a Herculean effort by VStar's creator David Benn along with some invaluable editorial and annotational help from Kristine Larsen, this long-anticipated publication has become a reality.

To get your copy, please visit the VStar Overview page and click on the yellow button marked "Download VStar User Manual". You will be glad you did!

24 September Special Notice #371: BB Ari observations particularly crucial now

September 24, 2013: HST/COS is scheduled to observe the SU UMa-type variable BB Ari:

BB Ari  2013 September 27 03:01:26 through 06:29:37 UT

The HST scheduling team will likely make their final decision early on September 26, so your observations are essential NOW.

17 September New membership classifications, benefits and dues

There have been some changes in membership classifications, benefits and dues for the 2014 membership year.

Regular Annual dues will now be $75.00. The annual Sustaining membership rate will be raised to $150.00. If you are an educator, student, have a limited income or you are on a pension, your dues will be $37.50 per year.

16 September Solar Bulletin - Volume 69, Number 8

The August 2013 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:

11 September Special Notice #370: GZ Cet observations crucial now

September 11, 2013: HST/COS is scheduled to observe the WZ Sge-like SU UMa variable GZ Cet (SDSS J013701.06-091234.9) the day after tomorrow. Observations are scheduled for:

GZ Cet  2013 Sep. 13 12:24:02 through 19:06:54 UT

The scheduling team will likely make their final decision early TOMORROW (September 12), so your observations are essential NOW.

09 September New eJAAVSO preprint: Amplitude variations in pulsating red giants

ejaavso 243: "Amplitude Variations in Pulsating Red Giants" by J. R. Percy, R. Abachi

09 September New eJAAVSO preprint: V784 Oph: RR Lyr Star with multiple Blazhko modulations

ejaavso 242: "V784 Ophiuchi: an RR Lyrae Star with Multiple Blazhko Modulationsi" by P. de Ponthiere, F.-J. Hambsch, T. Krajci, K. Menzies

05 September Special Notice #369: GZ Cet (SDSS J013701.06-091234.9) HST/COS obs next week

September 5, 2013: HST/COS is scheduled to observe the WZ Sge-like SU UMa variable GZ Cet (SDSS J013701.06-091234.9) next week. Observations are scheduled for:

GZ Cet  2013 Sep. 13 12:24:02 through 19:06:54 UT

05 September New eJAAVSO preprint: Discovery of Pulsating Components in Southern Eclipsing Binary Systems

ejaavso 241: "Discovery of Pulsating Components in the Southern Eclipsing Binary Systems AW Velorum, HM Puppis, and TT Horologii" by D. J. W. Moriarty, T. Bohlsen, B. Heathcote, T. Richards, M. Streamer

30 August Alert Notice 490: Optical monitoring of T Ori requested

August 30, 2013: Dr. William Herbst (Wesleyan University) and Rachel Pedersen (Bates College) have requested AAVSO assistance in monitoring the Orion variable T Ori in support of spectroscopy they will be obtaining during September 2013. AAVSO nightly coverage (visual or electronic, not time series) of this star is crucial throughout the month of September.

20 August What's in store for Nova Del 2013?

No one knows what Nova Del 2013 will do next, but there are some tantalizing possibilities. 

The current AAVSO light curve for Nova Del 2013

So far it appears Nova Del 2013 is a 'slow nova', type NB in VSX. By definition, it takes 150 days or more for a slow nova to fade by 3 magnitudes. 

Sometimes "or more" can mean a lot of other exciting goings on.

19 August Nova Del 2013

Welcome, fans of Nova Del 2013!

Below is a listing of the various AAVSO publications, posts, and articles on the new bright nova in Delphinus.  Use the links on the right side of the page to find out more about the AAVSO and how you can get in on the action. 

Clear skies!


16 August AAVSO Alert Notice 489: Nova Delphini 2013 = PNV J20233073+2046041

August 16, 2013

Event: Nova Del 2013 = PNV J20233073+2046041

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

Discovery Magnitude: unfiltered CCD magnitude mag 6.8 using a 0.18-m reflector

Discovery date: 2013 Aug. 14.584 UT

Coordinates: R.A. 20 23 30.73  Decl. +20 46 04.1  (2000.0)

16 August Binocular Sequence and Charts Now Available for Nova Del 2013

Due to the very bright eruption of Nova Del 2013, we have created a binocular sequence specifically for this nova that can be plotted using the Binocular Chart option on the chart plotter (VSP). 

For best results specify a field of view of 900 arc minutes (15 degrees) and a limiting magnitude of 7 and click on the Binocular Chart option. This will produce an uncluttered chart with a sequence from 6.9 - 3.5V for use with binoculars. Or you may simply download the chart attached to this page.

13 August Solar Bulletin - Volume 69, Number 7

The July 2013 Solar Bulletin is now available.

12 August New eJAAVSO preprint: Data mining the Ogle-II I-band database...

ej240: "Data Mining the Ogle-II I-band Database for Eclipsing Binary Stars" by Marco Ciocca

05 August AAVSO Professional Survey for 2013

AAVSO Councillor Kevin Paxson has completed and presented the results of the AAVSO's survey of the professional astronomical community.  The AAVSO solicited participation from professional astronomers in an online survey early this year, and the results are now available in both raw and summarized form, with commentary and analysis from Kevin.  The results were presented at the 2013 Spring Meeting of the AAVSO, and the final reports are now avail

01 August Alert Notice 488: Observations of AA Tau requested to schedule XMM-Newton

August 1, 2013: Dr. Hans Moritz Guenther (Harvard-Smithsonian Center for Astrophysics) has requested nightly observations of the classical T Tauri star AA Tau in order to schedule x-ray observations with XMM-Newton that have been planned for between 2013 August 15 and September 15.

01 August Search for New AAVSO Director Underway!

From: Kevin B. Marvel, AAVSO Director Search Committee Chair and Executive Director, American Astronomical Society

26 July Special Notice #368: Bright transient in M74 - PSN J01364816+1545310

July 26, 2013:  Patrick Schmeer (SPK, Bischmischeim, Germany) reports via baavss-alert and vsnet-alert that a bright (12.4 U) transient, discovered in M74 (NGC 628) on 2013 July 25.80 UT, has been announced on the CBAT Transient Objects Confirmation Page. The discover's name does not appear there. The presence of the transient has been confirmed by Andrzej Pigulski on 2013 July 27 0:00 UT in vsnet-alert 16057.

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