Alert Notice 412: Nova Sct 2009 (V496 Sct)

November 10, 2009

Event: Nova in Scutum (V496 Sct == N Sct 2009)

Discovered By: H. Nishimura (Miyawaki, Kakegawa, Japan)

Discovery Date: 2009 November 8.370 UT

Discovery Magnitude: unfiltered CCD magnitude of 8.8, using 120-mm camera lens, derived by S. Nakano (Sumoto, Japan) from Nishimura's discovery images.

Position: RA: 18:43:45.57 , Dec: -7:36:42.0 (equinox 2000.0)
from E. Guido and G. Sostero, using a 0.25-m reflector sited at Mayhill, New Mexico, USA.

Spectra: A low-resolution spectrum was obtained by F. Teyssier using a 0.2-meter telescope equipped with a spectrograph having an effective resolution of 8.56 Angstroms (4.28 Angstroms/pixel, 2-pixel bins). This spectrum clearly shows the presence of the H-alpha and H-beta lines, both having P Cygni profiles. Several weaker emission lines are also present. D. Balam (NRCC) and G. Sarty (U. Sask.) obtained a spectrum covering the wavelength range of 429-455 nanometers on 2009 November 10.08 UT confirming the presence of several emission lines having P Cygni profiles. U. Munari et al. (INA-Padova & the Asiago Novae and Symbiotic Stars Collaboration) report a low-resolution spectrum (0.21 nm/pix) obtained on 2009 November 9.779 UT with a 0.6-meter telescope. The spectrum contains multiple emission lines including the H-Balmer series, OI, and FeII, all with P Cygni profiles. The presence of FeII lines indicates a nova of the Fe II-type.

Observations Reported to the AAVSO:
2009 Nov 9.0932 UT (JD 2455144.5932), R=7.76 (V. Mechinsky, Minsk, Belarus);
Nov 9.7549 (2455145.2549), m(vis)=8.4 (S. Shaffer, Laramie, Wyoming, USA);
Nov 9.8717 (2455145.3717), CV=8.61 (C. Spratt, Victoria, B.C., Canada);
Nov 10.0506 (2455145.5506), V=8.04 (S. Howerton, Arkansas City, Kansas, USA);
Nov 10.0625 (2455145.5625), m(vis)=8.4 (S. Aguirre, Hermosillo, Sonora, Mexico).

Charts: Finder charts for V496 Sct may be plotted by entering the coordinates above into VSP:

Reporting Observations: Please report all observations to the AAVSO as "V496 Sct". The names "Nova Sct 2009" or "VSX J184345.5-073642" are equivalent, but the GCVS name is preferred.

Notes: a. The object was initially announced in CBET 2008 (D.W.E. Green, editor), where the discoverer notes that no object was visible on an image taken on 2009 November 7.377 using the same camera, with a limiting magnitude of 11.5 (unfiltered).

b. E. Guido and G. Sostero reported their confirmation and improved position in CBET 2008, with images taken with the GRAS 0.25-m telescope sited near Mayhill, NM on 2009 November 9.08. Guido and Sostero also note that no unambiguous progenitor appears on a red DSS plate taken on 1996 August 13.

c. F. Teyssier (Rouen, France) kindly provided a spectrum of the object taken on 2009 November 9.729 indicating the presence of Hydrogen and other emission lines with P Cygni profiles. An image of this spectrum may be obtained from the following website:

d. Information on name assignment and spectroscopic information used in this Alert Notice were taken from IAU Circular 9093 (D.W.E. Green, editor). This Alert Notice supersedes AAVSO Special Notice #176 (2009 November 9).

Congratulations to H. Nishimura for his discovery!

Good observing,

Matthew Templeton, AAVSO



Information on submitting observations to the AAVSO may be found at‭:‬


An Alert Notice archive is available at the following URL‭:‬

Subscribing and Unsubscribing may be done at the following URL‭:‬