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AAVSO Alert Notice 311: 0505-68 YY Dor - Possible recurrent nova AND 2247-14 IL Aqr - Exoplanet transit campaign

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October 21, 2004

SUBJECTS:

1. 0505-68 YY DOR - POSSIBLE RECURRENT NOVA
2. 2247-14 IL AQR - EXOPLANET TRANSIT CAMPAIGN UNDERWAY

1. 0505-68 YY DOR - POSSIBLE RECURRENT NOVA

Event: Possible recurrent nova (currently classified in GCVS as NA, Nova 1937)

Discovered By: William Liller, Vina del Mar, Chile

Discovery Magnitude: 11.0 V

Discovery Date: The object appears on two photographs taken with unfiltered Kodak TP film and a 0.2-m Schmidt camera on October 20.193 UT

Position: R.A. (2000): 05h 57m 03.3s, Decl. (2000): -68o 54' 58" (GCVS); Subramaniam & Anupama (2000) report end figures 04.44" and 47.92", respectively

Spectra: no spectra to date

AAVSO Chart(s): An AAVSO chart is in production and will be posted to the following URL when it is ready: http://www.aavso.org/cgi-bin/searchcharts3.pl?name=yy%20dor    [obsolete link; create chatrts using VSP at http://www.aavso.org/vsp ]

Report Object to the AAVSO as: 0505-68 YY DOR

Observations reported to the AAVSO: Oct. 21.576 UT, 12.0, A.Pearce, Nedlands, W. Australia; 21.88, 12.0 CCDV, B. Monard, Pretoria, South Africa

Notes: a. According to the GCVS, the maximum photographic brightness was 10.8 b. Subramaniam & Anupama (2000) give t3 = 3D 19.9 days c. There is a red star very near the position of Liller's object that B. Skiff, Lowell Observatory, reports may be a possible Mira, according to comments by Hoffmeister and observations by McKibben; Skiff suggests that the red star is not YY Dor, and "that the location of the nova is not yet established" (AAVSO Discussion Group posting, 21 October 2004).

Congratulations to Bill on his discovery!

2. 2247-14 IL AQR - EXOPLANET TRANSIT CAMPAIGN UNDERWAY

The AAVSO is working with Dr. Greg Laughlin of, University of California at Santa Cruz, to detect possible exoplanet transits of the M dwarf variable IL Aqr, known as GJ 876 in the exoplanet transit community. CCD observers are currently in the midst of a campaign to look for a transit of the larger of two known planets around the star. (CCD Views #326). The campaign began yesterday, October 20, and continues until 15:23 October 23. More observers are needed. For charts, observing strategy, campaign reports and more visit the following URL:

http://www.aavso.org/news/ilaqr.shtml [obsolete link; read at http://www.aavso.org/ilaqr ]

In addition, after the campaign is completed nightly high-precision CCDV observations of IL Aqr are requested through the end of the year.

SUBMIT OBSERVATIONS TO THE AAVSO

We encourage observers to submit observations via our web site (online data submission tool WebObs), or by email in AAVSO format to observations@aavso.org. If you do not have AAVSO Observer Initials, please contact Headquarters so we may assign them to you. The answering machine at AAVSO Headquarters is on nights and weekends; use our charge-free number (888-802-STAR = 888-802-7827) to report your observations, or report them via fax (617-354-0665).

Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Elizabeth O. Waagen
Interim Director

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