Skip to main content


Alert Notice 473: T Tauri stars observing campaign

November 6, 2012:  Darryl Sergison (University of Exeter) has requested AAVSO assistance with a campaign he is organizing on six T Tauri stars. He writes: "In Autumn 2013 I [and my PhD supervisor Tim Naylor of Exeter University are] undertaking a new study into the nature of pre-main-sequence low mass stars, using time series optical spectroscopy and UV-Visual-IR build a clearer picture of the environment around young solar-type stars and characterise their various disc, accretion, and outflow structures.

Special Notice #299: Observations needed TODAY of SDSS J164248.52+134751.4

October 10, 2012: Dr. Boris Gaensicke (leader of the consortium observing CVs with the HST COS instrument; see AAVSO Alert Notice 471 and AAVSO Special Notice #297 for details and instructions) writes with an urgent message:
"STScI would like an update on SDSS J164248.52+134751.4 by ~16UT TODAY (2012 October 10), when the star is not easily visible for most of our observers. Any observations from Europe early this evening will be most welcome."

Alert Notice 464: Observers requested for Jovian Extinction Events (JEE2012)

July 5, 2012:  Scotty Degenhardt (Santa Fe, NM), a pioneer in the use of video for timing eclipses of solar system and stellar objects and a research member of the International Occultation Timing Association (IOTA), has informed the AAVSO of a research project he and colleagues are working on: modeling the Jovian dust field, moon atmospheres, and Io’s Torus through Jovian Extinction Events (JEE). He has invited AAVSO observers to participate by observing these Jovian extinction events and reporting their observations.

Special Notice #280: HST UV spectroscopy observations of S Dor scheduled

May 9, 2012: We have been informed by Dr. Noel Richardson, Georgia State University, that the UV spectroscopy observations of S Dor to be made with the Hubble Space Telescope have been scheduled for

2012 MAY 11 from 21:21:55 UT to 23:55:04 UT.

During the 24 hours prior to and following the HST observations, as well as during them, please increase your visual/BVRI (or as many of these filters as you can) coverage from once per night to twice per night. Afterwards, please return to nightly observations until further notice.

Alert Notice 457: Monitoring Nova Oph 2012 for multiwavelength observations [V2676 Oph]

April 10, 2012:  Dr. Michael Rupen (National Radio Astronomy Observatory, Socorro, NM) has informed us that he and his colleagues of the EVLA (Expanded Very Large Array) Nova Team are carrying out a multiwavelength campaign on the Fe II-type nova Nova Oph 2012 [V2676 Oph]. They have triggered observations with Swift, JVLA (Jansky Very Large Array), SMA (Submillimeter Array), and high-resolution optical spectroscopy. He is requesting AAVSO observations in support.

Special Notice #267: HST observations of CH Cyg scheduled and monitoring urgently needed

March 15, 2012:  As announced in AAVSO Alert Notice 454 (, Dr. Margarita Karovska, Harvard-Smithsonian Center for Astrophysics, has requested multiband photometry (all possible bands), high-speed photometry, spectroscopy, and visual observations of the symbiotic variable CH Cyg in support of HST and Chandra observations. She is studying the central region of CH Cyg and its jet.

Alert Notice 453: Monitoring of S Dor requested for multiwavelength campaign

February 23, 2012:  Dr. Noel Richardson, Georgia State University, has requested monitoring of the luminous blue variable (LBV) prototype S Doradus as part of a multiwavelength campaign he is coordinating to study the photosphere of this star. At present the observations planned include:

1. UV Spectroscopy from HST
2. Optical spectroscopy from CTIO and an amateur in Australia
3. Near-IR Spectroscopy from SOAR (pending approval)
4. Mid-IR photometry from Gemini (pending approval)


AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484