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News and Announcements

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

This year's spring meeting will begin on Thursday evening, May 5, at 6pm CDT (23:00 UT), with a keynote address by Dr. Horace Smith, Professor Emeritus of Michigan State University and a noted expert on RR Lyrae stars. Dr.

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:

https//www.aavso.org/solar-bulletin

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.).

Coordinates: 13:30:05.08 +47:10:11.2  (J2000.0)
Coordinates source is Silverman et al., ATEL 3398

Observations should be submitted to the AAVSO International Database using the name SN 2011dh.

16 March Alert Notice 541: V3661 Ophiuchi = Nova Oph 2016 = PNV 17355050-2934240

March 16, 2016

Event: Nova in Ophiuchus

Independent discovery by:  
 - Minoru Yamamoto (Okazaki, Aichi-ken, Japan, reported via H. Yamaoka, Kyushu University)
 - Yuji Nakamura (Kameyama, Mie, Japan, reported via Yamaoka)

Discovery magnitude:
 - Yamamoto: ~10.6 on four 15-second frames and using a Canon 5DMRK2 camera + 135-mm lens
 - Nakamura: ~10.6 on a 30-second CCD image and using a 135-mm lens  

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:

https://www.aavso.org/solar-bulletin

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:

DSLR Observing Manual - Version 1.4

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:

https://www.aavso.org/solar-bulletin

The MMM SID Data report is available here: https://www.aavso.org/sid-database

11 February AAVSO Brite Targets

BRITE-Constellation Ground Based Observations Team (GBOT) links:

http://www.univie.ac.at/brite-constellation/html/gbs-internal.html

http://www.univie.ac.at/brite-constellation/html/gbot-amateurs.html

08 February Alert Notice 536: SS Cyg monitoring requested for radio campaign

February 8, 2016:  Further to AAVSO Special Notice #412, Dr. James Miller-Jones (International Centre for Radio Astronomy Research, Curtin University, Perth, Western Australia) and colleagues have requested AAVSO assistance in support of their multiwavelength (radio and optical) campaign on the dwarf nova SS Cyg. Close monitoring of SS Cyg and immediate reporting of observations to the AAVSO via WebObs is requested beginning now.

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