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AAVSO ALERT NOTICE 315 (March 21, 2005)

SUBJECT: 1612-51 N NOR 05

Event: Nova

Discovered By: William Liller, Viña del Mar, Chile

Discovery Magnitude: Red magnitude 9.4 on hypersensitized TP films taken with an 85mm f/1.4 Nikon lens and with an orange filter.

Discovery Date: March 13.309 UT

Position: R.A. (2000): 16h 19.8m Decl. (2000): -51o 35' (by Liller; also see notes below)

Spectra (from Central Bureau Electronic Telegram (CBET) 124): A. Ederoclite, E. Mason, and T. H. Dall, European Southern Observatory (ESO), report spectroscopic confirmation made with the 3.6-m ESO telescope (+ HARPS; range 380-690 nm; resolution 100000). The nova appears dominated by very strong H_alpha emission. Low-ionization emissions lines from Fe II (multiplets 27, 28, 37, 38, 42, 48, 49, and 74) and Na I are clearly visible. The Balmer and Fe II lines are flanked by weak P-Cyg profiles that indicate an average expansion velocity of 1100 +/- 100 km/s. The Na I interstellar lines appear saturated, thus suggesting a high absorption/reddening.

AAVSO Chart(s): Due to significant Chart Team presence at the The 3rd High-Energy Astrophysics Workshop for Amateur Astronomers and The 94th Spring Meeting of the AAVSO in Las Cruces, New Mexico (March 20 - 26, 2005), an AAVSO chart will be forthcoming. In the meantime, observers are referred to the following charts prepared by Sebastian Otero, Buenos Aires, Argentina:

Report Object to the AAVSO as: 1612-51 N NOR 05

Observations Reported to the AAVSO: Mar. 09.37 UT, <11.0 PTG with orange filter (red magnitude), William Liller, Chile; 13.309, 9.4 PTG with orange filter (red magnitude), Liller; 18.32, 8.9 PTG with orange filter (red magnitude), Liller; 20.038, 9.8 CCDV, B. Monard, S. Africa; 20.04, 8.5 CCDR, Monard; 20.195, 10.1, Raquel Yumi Shida, Brazil; 20.326, 10.10 CCDV, Liller; 20.326, 10.90 CCDB, Liller; 20.516, 10.4 CCDV, Peter Nelson, Australia; 20.521, 9.7, Rod Stubbings, Australia; 20.88, 10.1, Andrew Pearce, Australia.


  1. Liller reports that the object was not visible down to red magnitude 11 on two photos taken on March 9.37 UT.
  2. B. Monard, Pretoria, South Africa reports the position as R.A. (2000): 16h 19m 45.67s Decl. (2000):-51o 36’ 07.2” with reference to UCAC2 coordinates.
  3. P. Nelson, Australia reports the position as R.A. (2000): 16h 19m 44.80s Decl. (2000):-51o 34’ 52.22” with reference to UCAC2 coordinates.
  4. An AAVSO web page for N Nor 05 can be found at We invite you to submit photos, spectra, etc. of this object to be placed there.

Congratulations to Bill on his discovery!


We encourage observers to submit observations via our web site (online data submission tool WebObs), or by email in AAVSO format to 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!

Kerriann Malatesta
Technical Assistant

On behalf of,
Elizabeth O. Waagen
Senior Technical Assistant

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