News and Announcements
|25 May||Special Notice #416: Extension to 20 CVs campaign||
May 25, 2016: Roque Ruiz-Carmona, the principal investigator on the observing campaign on 20 CVs that was announced in AAVSO Alert Notice 543, reports that the campaign has been revised due to telescope issues. He writes:
|24 May||Alert Notice 543: 20 Cataclysmic variables to be observed by William Herschel Telescope||
May 24, 2016: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance with his campaign to observe a set of 20 cataclysmic variables (CVs) with the William Herschel Telescope (WHT) at La Palma TONIGHT.
|17 May||Solar Bulletin - Volume 72, Number 04||
The April Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin
|11 May||Manual for Visual Observing of Variable Stars in Polish||
Thanks to a lot of hard work by Ariel Majcher, Bogdan Kubiak, Marcin Biskupski, Michał Kwieciak, and Piotr Guzik, the AAVSO Manual for Visual Observing of Variable Stars (2013 edition) is now available in Polish. You may download this Manual (free-of-charge) from here.
|27 April||2016 Annual Campaign: Providing Certainty in Uncertain Times||
We live in exciting, unpredictable times. The boundaries of our knowledge are expanding at an accelerating rate, just like the universe we live in. It is impossible to know what the world will look like even five years from now.
|26 April||AAVSO Newsletter 68, April 2016, is published||
AAVSO Newsletter 68, April 2016 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.
|21 April||Remote Access Links for the 2016 Spring Meeting|
|20 April||AAVSO joins Astronomers Without Borders (AWB) for the Global Astronomy Month (GAM)||
The AAVSO has joined Astronomers Without Borders to support them during their GAM (Global Astronomy Month) activities.
|14 April||Solar Bulletin - Volume 72, Number 03||
The March Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:
|08 April||Special Notice #415: T CrB brighter and bluer - monitoring requested||
April 8, 2016: The symbiotic recurrent nova T CrB has entered a super-active state, and it is brighter and bluer than it has been since before its last outburst in 1946. Multicolor and visual ongoing observations are requested.
|08 April||Alert Notice 542: Continuing observations requested for KIC 08462852||
April 8, 2016: Further to AAVSO Alert Notice 532, the AAVSO is requesting ongoing time-series observations of the enigmatic variable object KIC 08462852 (= KIC 8462852) beginning immediately and continuing through at least the end of 2016.
Details on KIC 08462852 (V=11.88) were given in Alert Notice 532.
Observations are requested in order to study not only the aperiodic fading events but also the behavior of the star outside of these events.
|05 April||Special Notice #414: SS Cyg monitoring continues for radio campaign||
April 5, 2016: Further to AAVSO Alert Notice 536, close monitoring of the cataclysmic variable SS Cyg is urgently requested. Immediate notification of the beginning of the anticipated outburst is crucial and is requested.
The success of the multiwavelength (radio and optical) observing campaign on SS Cyg underway depends on immediate reporting of outburst behavior to trigger multi-site radio observations.
|04 April||Charts and Sequences Team Update April 2016||
The charts and sequences team has been busy over the last several months preparing new sequences for newly discovered objects and revised sequences intended to improve existing sequences. If you observe any of these objects please update your charts and/or sequences.
|04 April||Free Access to the May 5 Keynote Address at the AAVSO Spring Meeting||
The theme of this year’s spring meeting is Pulsating Stars. The meeting will begin on Thursday evening at 6pm CDT with a keynote address by Dr. Horace Smith, Professor Emeritus of Michigan State University and a noted expert on RR Lyrae stars. Dr.
|24 March||Special Notice #242: SN 2011dh = Supernova in M51 = PSN J13303600+4706330||
June 3, 2011: As an update to AAVSO Special Notice #241 (http://www.aavso.org/aavso-special-notice-241), the supernova in M51 has been designated SN 2011dh. Discovery, classification, and observation information have been published in IAU CBET 2736 (Daniel W. E. Green, ed.).
|16 March||Alert Notice 541: V3661 Ophiuchi = Nova Oph 2016 = PNV 17355050-2934240||
March 16, 2016
Event: Nova in Ophiuchus
Independent discovery by:
|15 March||Solar Bulletin - Volume 72, Number 02||
The February Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:
The February SID Data report is available here: https://www.aavso.org/sid-database
|10 March||Alert Notice 540: Secondary eclipse of b Persei is underway||
March 10, 2016: Further to AAVSO Alert Notice 537, the anticipated secondary eclipse of b Per is underway, according to information from campaign astronomer Dr. Donald F. Collins. Dr. Collins writes:
|09 March||DSLR Observing Manual - Version 1.4||
Thanks to a fantastic volunteer effort by Mark Blackford, the DSLR Observing Manual has been revised and improved.
To read more about it and download a copy (free-of-charge) please click here:
Be sure also to take a look at Mark's Photometry Software Calibration and Photometry Tutorials available on the website for the first time.
Thank you Mark!
|01 March||Alert Notice 539: Dwarf novae observations requested for VLA campaign||
March 1, 2016: Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen (Netherlands) and University of Cape Town) and colleagues have requested AAVSO observer assistance in monitoring several northern dwarf novae in support of their campaign to observe them with the Very Large Array (VLA) in their ongoing radio jet research. Their research on radio jets in dwarf novae has been discussed in AAVSO Alert Notice 505.
|26 February||Alert Notice 538: Observations of V694 Mon (MWC 560) requested for Chandra campaign||
February 26, 2016: Dr. Jeno Sokoloski (Columbia University) and Mr. Adrian Lucy (graduate student, Columbia University) have requested AAVSO observations of the jet-driving symbiotic star V694 Mon (MWC 560), which is in outburst, in support of upcoming Chandra observations to investigate the state of the inner accretion disk during this outburst.
The Chandra observations are scheduled (preliminary schedule) for 2016 March 8 (7:17-14:13 UTC) and March 9 (2:20-9:17 UTC).
|26 February||Alert Notice 537: Observations of a secondary eclipse of b Persei requested||
February 26, 2016: Dr. Donald F. Collins (AAVSO member, Swannanoa, NC), Dr. Robert Zavala (US Naval Observatory, Flagstaff Station), and Jason Sanborn (Lowell Observatory) request high time-resolution observations of the bright eclipsing star b Persei (not beta) during an expected secondary eclipse of the third star of the system as it is expected to pass behind the close orbiting stars of the system in the two weeks centered on March 7, 2016. Dr. Collins provides the information below.
|25 February||AAVSO Bulletin 79 for 2016 published||
AAVSO Bulletin 79 - Predicted Dates of Maxima and Minima for 381 Long Period Variables for 2016 is published and available on the AAVSO website. This publication covers the interval 1 January 2016 through 28 February 2017. All Bulletin-related materials may be found via the main Bulletin page.
|23 February||Special Notice #413: SU UMa observations needed now||
February 23, 2016: Deanne Coppejans (Department of Astrophysics, Radboud University Nijmegen) requests observations of the dwarf nova SU UMa now in order to determine its status. She and colleagues observed it on 20 February 2016 with the Very Large Array (VLA) and need to know whether it is (was) in outburst.
Observations of SU UMa in the AAVSO International Database from around the time of the VLA observations show it to be in quiescence:
|16 February||Solar Bulletin - Volume 72, Number 01||
The January Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:
The MMM SID Data report is available here: https://www.aavso.org/sid-database