Note: This page, together with the AAVSO Target Tool Alerts/Campaigns target list, replaces the following AAVSO webpages: AAVSO Alert Notice Archive, AAVSO Special Notice Archive, and the original Observing Campaigns webpage. - July 2017
Click here for Active Alert Notices.
There are two types of AAVSO Alert Notices:
THIS PAGE IS OBSOLETE. A REVISED VERSION OF THIS PAGE SHOWING CAMPAIGN STATUS FLAGS IS NOW THE PAGE SEEN AT aavso-alert-notices-for-observing-campaigns-and-discoveries - Elizabeth O. Waagen, 17 April 2020
Note: This page, together with the AAVSO Target Tool Alerts/Campaigns target list, replaces the following AAVSO webpages: AAVSO Alert Notice Archive, AAVSO Special Notice Archive, and the original Observing Campaigns webpage. - July 2017
In order to help simplify answering the question "What should I observe tonight?", we have consolidated some of the places on the AAVSO website to look for information on urgently-needed observations. As of July 31, 2017, the three webpages:
have been consolidated into one new page:
July 28, 2017: The AAVSO Special Notice is being discontinued as of July 28, 2017. This notice - #430 - is the last Notice of the publication.
The type of information supplied in AAVSO Special Notices will now be supplied in the AAVSO Alert Notices and/or in the AAVSO online forums on Campaigns & Observation Reports, Time Sensitive Reports, and the other Variable Star Observing and Variable Star forums, as appropriate.
November 3, 2007: The Central Bureau for Astronomical Telegrams (see CBET 1114) has announced the discovery of supernova SN 2007oc in the southern galaxy NGC 7418A. The galaxy was discovered at magnitude 13.6 on November 3.06 UT (approx JD 2454407.5). The supernova has since been detected on an image taken October 23.09 (approx JD 2454396.6) at magnitude 13.3, and is therefore in its declining phase.
The J2000 coordinates of the supernova are given as
RA: 22 56 41.77 Dec: -36 46 22.3
October 22, 2007: The Microvariability and Oscillations of Stars (MOST) Satellite will conduct a targeted photometric observing campaign on the cataclysmic variable TT Ari, beginning 2007 October 23 UT (JD 2454397) and concluding on 2007 October 28 (JD 2454402). This observing program was proposed by a group of Austrian amateur astronomers who proposed to the "MOST fuer Alle" program of the University of Vienna, the Austrian partner project of the MOST collaboration's "My Own Space Telescope" program for Canadian observers.
October 17, 2007: Further to AAVSO Special Notice #73, "SN 2007le in NGC 7721", a comparison star sequence has now been added to the AAVSO Variable Star Plotter (VSP). The sequence by A. Henden was obtained at SRO based upon a single night of data; the calibration is estimated to have a zero-point accuracy of approximately 0.03 magnitudes.
October 15, 2007: SN 2007le was discovered in the galaxy NGC 7721 on October 13, 2007 by L.A.G. (Berto) Monard of Pretoria, South Africa (CBET 1100, Monard). The supernova has since been classified as a type-Ia, approximately 7-10 days prior to maximum (CBET 1101, Silverman et al.).
The coordinates of the supernova are:
RA: 23:38:48.41 , Dec -6:31:21.3 (J2000)
October 12, 2007: A new large-amplitude cataclysmic binary, most likely a WZ Sge system, was discovered by K. Malek of the "Pi of the Sky" team in mid-September. It has been linked to the following ROSAT RASS object:
1RXS_J023238.8-371812
and has coordinates of
02:32:38.13 -37:17:54.7 J2000
It was about 11th magnitude upon discovery, and displayed superhumps with period 0.066d.
October 11, 2007: The next HST object from Paula Szkody's program is scheduled to be observed during the week of October 29 through November 3. This is SDSS J074531.92+453829.5, another cataclysmic variable that is about V=19.1 at quiescence, and unknown brightness in outburst since it has never been observed to outburst. The coordinates are:
07:45:31.92 +45:38:29.5 J2000
and the AAVSO Harvard Designation and name is
0738+45 SDSS074545
