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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)

Special Notice #262: Long-term monitoring of AGN targets extended

November 2, 2011:  The observing campaign described in AAVSO Alert Notice 443 (M. Templeton) has been extended through the end of November 2011. One of the original targets, NGC 6814, has been removed from the target list for the remainder of the campaign.

Special Notice #252: Upcoming Eclipse of Zeta Aurigae

September 8, 2011:

Jeff Hopkins (Hopkins Phoenix Observatory, Phoenix, AZ) communicates regarding the upcoming eclipse of the 4th-magnitude binary system zeta Aurigae. He writes:

Alert Notice 441: Monitoring of Bright Giant Variables requested in support of ground-based spectroscopy and for long-term study

May 27, 2011: Dr. Steve Howell (NASA) and Dr. Travis Rector (University of Alaska, Anchorage) have requested AAVSO observations of several bright giant variable stars of diverse classes.  This request is for immediate support of spectroscopic observations to be made at Kitt Peak National Observatory between 2011 May 30 and 2011 June 01 (JD 2455712 - 714).  However, observers are encouraged to continue long-term monitoring of these objects.

Alert Notice 440: PEP Observing Campaign on P Cygni


May 17, 2011:  Ernst Pollmann, an active spectroscopist in Germany and leader of Active Spectroscopy in Astronomy, has requested the assistance of AAVSO photoelectric photometry (PEP) observers in a campaign to observe the S Doradus variable P Cygni through the 2011 observing season.

PEP data are needed for correlation with spectra of P Cyg obtained by Ernst and other spectroscopists as they study this very interesting star.

Alert Notice 426: Rescheduled request for observations of V455 AND in support of HST observations

October 5, 2010: As originally announced in AAVSO Alert Notice 423, Dr. Paula Szkody (U. Washington) has requested the help of AAVSO observers in monitoring the WZ Sge-type cataclysmic variable V455 And in support of Hubble Space Telescope ultraviolet spectroscopic observations.


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