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Alert Notice 316: Nova in Sagittarius = V5115 Sgr (=N Sgr 05) AND Announcement about AAVSO Alert Notice 315

March 30, 2005

SUBJECTS:

1. NOVA IN SAGITTARIUS: 1810-25 V5115 SGR (= N SGR 05)
2. ANNOUNCEMENT ABOUT AAVSO ALERT NOTICE 315

1. 1810-25 V5115 SGR (N SGR 05)

Event: Nova

Discovered Independently By (reported by S. Nakano, Sumoto, Japan, IAU Circular 8500):
- Hideo Nishimura, Kakegawa, Shizuoka-ken, Japan
- Yukio Sakurai, Mito, Ibakaki-ken, Japan

Discovery Magnitude (IAU Circular 8500):
- 8.7 (2 exposures, Kodak T-Max film, Pentax 6x7 camera, 200-mm f/4.0 lens) (Nishimura)
- 9.1 CCD (Fine Pix S2 digital camera, Nikon 180-mm f/2.8 lens) (Sakurai)

Discovery Date (IAU Circular 8500):
- March 28.779 UT (Nishimura)
- March 28.796 UT (Sakurai)

Position: R.A. (2000): 18h 16m 59.04s Decl. (2000): -25o 56' 38.8" measured by S. Nakano from Sakurai's .jpg image (IAU Circular 8500)

Spectra (IAU Circular 8501): L. Kiss, University of Sydney, and A. Derekas, University of New South Wales, obtained spectra with the Australian National University 2.3-m telescope (+ Double-Beam Spectrograph) at Siding Spring Observatory that show the object to be a nova. K. Ayani and Y. Kawabata, Bisei Astronomical Observatory, also obtained low-dispersion spectra that show the object to be a nova.

AAVSO Chart(s): No AAVSO chart has been made yet for this object. At present, please use the charts made by Sebastian Otero at http://ar.geocities.com/varsao/Carta_V4028_Sgr.htm (finder) and http://ar.geocities.com/varsao/Carta_Nova_Sgr_2005.htm (nova field).

Report Object to the AAVSO as: 1810-25 V5115 SGR (name assigned by N. Samus and E. Kazarovets, Institute of Astronomy, Russian Academy of Sciences, IAU Circular 8502)

Observations Reported to the AAVSO: March 29.737 UT, 8.2 CCD, K. Kadota, Ageo, Japan (IAU Circular 8501); 29.755, 7.8 CCD, S. Wakuda, Yuto-cho, Hamana-gun, Shizuoka-ken, Japan (via S. Nakano, IAU Circular 8501); 30.1563, 7.9, A. Amorim, Florianopolis, Brazil; 30.273, 7.7, R. Shida, Sao Paulo, Brazil.

Notes (from IAU Circular 8500):

  1. Nothing was visible on Sakurai's CCD images taken March 19, 20, 25 (down to magnitude 11.8).
  2. H. Yamaoka, Kyushu University, Japan, notes nothing is visible at this location on ASAS-3 image taken March 27.464 UT (down to magnitude ~14).
  3. Yamaoka notes a bright infrared source in the 2MASS catalogue has the position end figures 58.67s, 39.0".

Congratulations to Hideo Nishimura and Yukio Sakurai on their independent discoveries!

2. ANNOUNCEMENT ABOUT AAVSO ALERT NOTICE 315

Due to a technical error, you likely did not receive an electronic copy of AAVSO Alert Notice 315. We will re-send this Alert Notice for your files. We apologize for the inconvenience.

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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
Senior Technical Assistant

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