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News and Announcements

14 June Skin a Cat - Looking for period change in data

http://tamino.wordpress.com/2012/06/13/skin-a-cat/

13 June New eJAAVSO preprint: on pulsation, dust production, and mass-loss

(ej195): "Variable Stars and the Asymptotic Giant Branch: Stellar Pulsations, Dust Production, and Mass Loss" by A. K. Speck

www.aavso.org/ejaavso

12 June New eJAAVSO preprint: Centennial highlights in astronomy

(ej194): "Centennial Highlights in Astronomy" by O. Gingerich

www.aavso.org/ejaavso

12 June Alert Notice 461: Nova Scorpii 2012 = MOA 2012 BLG-320

12 June 2012

10 June Alert Notice 460: Possible occultation by Pluto from US East Coast

10 June 2012: We have been asked to help disseminate the news of a possible occultation by Pluto visible to observers on the US East coast. Although the AAVSO does not ordinarily issue announcements of upcoming occultations, in this case the object is Pluto and the NASA New Horizons mission (http://www.nasa.gov/mission_pages/newhorizons/main/index.html) will be visiting Pluto in 2015.

09 June Charts and Sequences Update June 2012

The following stars have new or revised sequences since the last update April 23, 2012. Please update you charts as needed.

 

08 June Special Notice #286: Revised Timetable for June AE Aqr MAGIC Observations

8 June 2012: Dr. Christopher Mauche, Lawrence Livermore National Laboratory, has informed us that the timetable of MAGIC telescope  observations of the intermediate polar cataclysmic variable AE Aqr announced in AAVSO Alert Notice 458 has been revised. Here is the revised timetable for the dates in June:

REVISED TIMETABLE AS OF 8 JUNE 2012

2012 June
11, 1:43 - 2:26, UT
12, 1:39 - 2:22
13, 1:35 - 2:18
14, 1:31 - 2:34

07 June Capabilities of large visual data sets

 

http://www.aavso.org/capabilities-large-visual-data-sets

07 June The AAVSO Strategy and Operations Survey Results

Survey Says - The AAVSO Strategy and Operations Survey

by Kevin Paxson

06 June Alert Notice 459: Monitoring of RU Peg requested for Swift observations

6 June 2012: Dr. Koji Mukai (Universities Space Research Association/NASA Goddard Space Flight Center) has requested AAVSO observers' assistance in monitoring the SS Cyg-type dwarf nova RU Peg in support of target-of-opportunity observations with the NASA Swift satellite during an outburst.

His observations will be targeted during the rise to outburst and during late decline from outburst. Thus, your prompt notification to AAVSO Headquarters of activity in RU Peg will be crucial to the success of this campaign.

01 June Through a Picket Fence - Overview of aliasing in data analysis

 

Grant Foster has written a new blog post titled "Through a Picket Fence". It describes the effect of aliasing when analyzing variable star data. It's written at an introductory level appropriate for those new to data analysis, but with brief references to the math more advanced people may find interesting. The post is at the URL below.

http://tamino.wordpress.com/2012/05/31/through-a-picket-fence/

01 June New eJAAVSO preprint: "Miras"

(ej193): "Miras" by L. A. Willson and M. Marengo

www.aavso.org/ejaavso

31 May Special Notice #285: Outburst of old nova X Ser

31 May 2012: As announced by Robert Modic (Richmond Heights, OH) 2012 May 30 in the aavso-photometry discussion group (http://www.aavso.org/pipermail/aavso-photometry/) and subsequently reported in vsnet-alert 14629, the old slow nova X Ser (Nova Ser 1903) is in outburst. This outburst is likely a dwarf nova-like outburst, similar to the one seen in 2009, which was the first reported since the nova outburst in 1903.

31 May New eJAAVSO preprint: Type 2 Cepheids in the Milky Way Galaxy and the Magellanic Clouds

(ej192): "Type 2 Cepheids in the Milky Way Galaxy and the Magellanic Clouds" by D. L. Welch

www.aavso.org/ejaavso

29 May Solar Bulletin - Volume 68, Number 4

The April 2012 Solar Bulletin is now available.

26 May Special Notice #284 - NOVA OPHIUCHI 2012 No. 2 = PNV J17395600-2447420

26 May 2012IAU CBET 3124 (Daniel W. E. Green, ed.) announces the discovery by John Seach (Chatsworth Island, NSW, Australia) of a nova in Ophiuchus on 2012 May 19.484 UT at magnitude 10.5 (digital SLR camera + 50-mm f/1.0 lens). Seach reports nothing is visible at this position on the Digitized Sky Survey. The object was designated PNV J17395600-2447420 when it was posted on the Central Bureau's TOCP webpage (http://www.cbat.eps.harvard.edu/unconf/tocp.html).

25 May Two new eJAAVSO preprints: on RR Lyr stars and on Digital Archiving

(ej191): "Digital Archiving: Where the Past Lives Again" by K. B. Paxson

(ej190): "RR Lyrae Stars: Cosmic Lighthouses With a Twist" by K. Kolenberg

www.aavso.org/ejaavso

24 May 2012 Spring Director's Report Now Online!

The 2012 Spring Director's Report presented during the AAVSO Meeting held in Big Bear, CA, was recorded and is now online to download and view.

Please click here to download the video. When unzipped it is an .wmv file which, with appropriate software, will be viewable on Windows, Macintosh, and Linux systems.

24 May Two new eJAAVSO preprints: on symbiotic stars and on RS Gru

(ej189): "Symbiotic Stars" by U. Munari

(ej188): "The Pulsational Behavior of the High Amplitude d Scuti Star RS Gruis" by J. R. García

www.aavso.org/ejaavso

23 May Special Notice #283: Supernova 2012cg IN NGC 4424 = PSN J12271283+0925132

May 23, 2012: IAU Central Bureau Electronic Telegram 3111 (Daniel W. E. Green, ed.) announces the LOSS discovery (reported by M. Kandrashoff, S. B. Cenko, W. Li, and A. V. Filippenko) of a supernova in NGC 4424 on 2012 May 17.22 at unfiltered magnitude 16.9.

Spectra indicating the object to be a Type Ia supernova discovered about two weeks before maximum were obtained by:

22 May Spring 2012 Director's Report to be broadcast online!

Join us on Wednesday, May 23rd at approximately 7:15pm Pacific/10:15pm Eastern/2:15 UT for Arne Henden's Director's Report.  On the heels of the very successful "Astro-April" series of webinar broadcasts for the Citizen Sky celebration and as part of the Spring 2012 Meeting being held jointly with SAS in Big Bear, California we are using GoToWebinar to broadcast Arne's talk.

Click here any time between now and the talk to register for the broadcast. (Mac or Windows)

21 May Special Notice #282: Apparent fading of V854 Cen

May 21, 2012: The R CrB star V854 Cen appears to be fading from maximum, according to recent observations reported to the AAVSO:

2012 May 17.1313 UT, 7.2 (B. Cudnik, Houston, TX);
17.380, 7.4 (P. Williams, Heathcote, NSW, Australia);
17.5069, 7.3 (D. Leys, Warrimoo, NSW, Australia);
17.5181, 7.4 (A. Plummer, Linden, NSW, Australia);
18.2125, 7.4 (Cudnik);
18.4917, 7.4 (Plummer);
19.1458, 7.5 (Cudnik);
19.3264, 7.35 (M. Linnolt, Ocean View, HI);

21 May New eJAAVSO preprint: Observations of Cataclysmic, RR Lyr, and High Amplitude d Scuti (HADS) Variable Stars

(ej187): "Intensive Observations of Cataclysmic, RR Lyr, and High Amplitude d Scuti (HADS) Variable Stars" by F. Hambsch

www.aavso.org/ejaavso

15 May New eJAAVSO preprint: Adverse Health Effects of Nighttime Lighting

(ej186): "Adverse Health Effects of Nighttime Lighting" by M. Motta

www.aavso.org/ejaavso

15 May Special Notice #281: Revised timetable for AE Aqr MAGIC observations

15 May 2012: Dr. Christopher Mauche, Lawrence Livermore National Laboratory, has informed us that the timetable of MAGIC telescope  observations of the intermediate polar cataclysmic variable AE Aqr announced in AAVSO Alert Notice 458 has been revised. Here is the revised timetable for the dates in May and early June:

2012 May
16, 3:30 - 4:49 UT
17, 3:21 - 4:49
18, 3:17 - 4:49
19, 3:13 - 4:47
20, 3:09 - 3:53
21, 3:06 - 3:49

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