News and Announcements
|26 September||New eJAAVSO preprint: Recent Minima of 146 EB Stars by G. Samolyk||
ej151: "Recent Minima of 146 Eclipsing Binary Stars" by G. Samolyk
|23 September||Astronomy Now Interview w/Williams and Saladyga||
Astronomy Now has posted an interesting dialog with the authors of Advancing Variable Star Astronomy: Tom Williams and Michael Saladyga.
|22 September||Special Notice 257: Reminder to observe V455 And for HST observations||
September 22, 2011: As detailed in AAVSO Alert Notice 448, Dr. Paula Szkody has requested monitoring of the WZ Sge-type cataclysmic variable V455 And through October 10. Observations tonight - September 22/23, tomorrow, and Saturday are crucial.
|16 September||Request to Take Astronomy Knowledge Survey||
Dear AAVSO Members and Observers,
|16 September||Special Notice #256: Request for fast optical time series of SN 2011fe||
September 16, 2011: Dr. Bradley Schaefer (LSU) requests fast time series of SN 2011fe over the next several weeks to attempt the detection of fast optical variations in supernova light.
The following request was prepared by Dr. Schaefer which we forward at his request:
|14 September||Special Notice 255: Cataclysmic Variable in Draco = PNV J18422792+4837425||
September 14, 2011: IAU CBAT Central Bureau Electronic Telegram 2818 (Daniel W. E. Green, ed.) announces the discovery by Hideo Nishimura, Miyawaki, Kakegawa, Shizuoka-ken, Japan, of a cataclysmic variable in Draco on 2011 Sept. 5.529 UT at magnitude 11.8 (reported by S. Nakano, Sumoto, Japan). The variable was designated PNV J18422792+4837425 when posted on the Central Bureau's TOCP webpage.
|14 September||Three new eJAAVSO preprints||
ej148: "Deep Infrared ZAMS FIts to Benchmark Open Clusters Hosting delta Scuti Stars" by D. J. Majaess, D. G. TUrner, D. J. Lane, T. Krajci
ej149: "Delta Scuti Behavior Detected in HD 349422" by G. Turner, R. Kaitchuck
ej150: "A Search for Eclipsing Binary Light Curve Variations Among MACHO Project Light Curves of 3,256 Fundamental-Mode RR Lyrae Variables in the Galactic Bulge" by M. W. Richmond
|14 September||Supernova Photometry Chat with Dr. Michael Richmond||
On 13 September, 2011, we had the good fortune to have Dr. Michael Richmond, Physics Professor and Observatory Director for the Rochester Institute of Technology in New York chat with us about SN 2011fe and supernova photometry in general. Here is the transcript from that chat session.
|12 September||Alert Notice 448: Request for observations of V455 AND in support of HST observations||
September 12, 2011:
|11 September||Alert Notice 447: Nova Sco 2011 No. 2 = PNV J16364440-4132340 = PNV J16364300-4132460||
September 10, 2011
|10 September||Special Notice #254: T Pyx Campaign continues||
September 10, 2011: The outbursting recurrent nova T Pyx is past solar conjunction and is widely observable again. Arto Oksanen in Finland has been following it through July and August and reports it currently at 10th magnitude. Please add T Pyx back to your observing schedule if possible to follow the decline of its outburst.
|10 September||Special Notice #253: Request for Observations of MAXI J1836-194||
September 10, 2011: Dr. Gregory Sivakoff (U. of Alberta) requests observations of the X-ray binary star MAXI J1836-194 as part of the JACPOT collaboration studying stellar radio jets from compact binaries. There is no predetermined duration for this campaign, but observations are requested now to coincide with ongoing X-ray and radio observations.
|09 September||Supernova Chat 13 Sept at 4:00PM ET||
Supernova 2011fe has been gaining a lot of interest, and not just among astronomers, either! News of SN 2011fe made "The News Hour" for instance.
|08 September||Special Notice #252: Upcoming Eclipse of Zeta Aurigae||
September 8, 2011:
|06 September||Supernova 2011fe: La supernova más brillante de los últimos 20 años|
|06 September||Special Notice #251: Possible transient in Scorpius||
September 6, 2011: John Seach (Chatsworth Island, NSW, Australia) reports the detection of a transient object in Scorpius, having a magnitude of 9.8 on 2011 September 6.37 UT (JD 2455810.87). Observations were made with a DSLR and 50mm f/1.2 lens and 5 second exposure, with limiting magnitude 10.5. The object is visible on four separate frames taken after the discovery was made.
|05 September||New Supernovae Photometry Discussion Forum|
|02 September||Supernova 2011fe: The brightest supernova in the last 20 years|
|02 September||AAVSO Receives National Science Foundation Award||
The AAVSO has been awarded a new grant from the National Science Foundation. This one is for 3 years and ~$660,000. As with Citizen Sky, it is from their Informal Science Education program. It is titled "Two Eyes, 3D: Studying Stereoscopic Representations in Informal Settings". Aaron Price is the PI with Co-PIs from Tufts University (Dr.
|01 September||Visual Observing Manual - Portuguese Version||
Thanks to the hard work and perseverance of David Duarte and his colleagues at the Centro de Estudos Astronômico de Alagoas (CEAAL), there is now a version of the AAVSO Manual for Visual Observing of Variable Stars available for download here:
We hope that this manual will be helpful to all of our many Portuguese-speaking observers and that you will feel free to share it with others.
|30 August||New eJAAVSO preprint: "Secular Variation of the Mode Amplitude-Ratio of the Double-Mode RR Lyrae Star NSVS 5222076, Part II, by D. Hurdis and T. Krajci||
"Secular Variation of the Mode Amplitude-Ratio of the Double=Mode RR Lyrae Star NSVS 5222076, Part II, by D. Hurdis and T. Krajci
|25 August||Alert Notice 446: Supernova 2011fe in M101 (NGC 5457) = PSN J14030581+5416254||
August 26, 2011
|24 August||Special Notice #250: Possible Type-Ia Supernova in M101||
P. Nugent et al. report in ATel #3581 that a possible Type-Ia supernova has been discovered by the Palomar Transient Factory shortly after eruption in the galaxy M101 and has been designated "PTF11kly". The object is currently at a magnitude of g=17.2, but may well rise by several magnitudes. The object is well placed within M101 for good photometry, and observations of this potential bright SNIa are strongly encouraged.
The (J2000) coordinates reported for the object are
RA: 14:03:05.81 , Dec: +54:16:25.4
|24 August||NSV 11154: A newly classified R CrB star||
A paper by Nutsinee Kijbunchoo (LSU) and others on the star NSV 11154 has just been accepted for publication in the Publications of the Astronomical Society of the Pacific. This paper "NSV 11154 is a New R Coronae Borealis Star" is now available on arXiv.org, and makes use of observations old and new.
|23 August||Nuevo foro de AAVSO en idioma español||
A partir de hoy, la AAVSO inaugura un espacio de intercambio para la comunidad hispanoparlante