AAVSO: AAVSO Alert Notice 320

SUBJECT: 1811-30 NOVA SAGITTARII 2005 NO. 2

Object: 1811-30 N SGR 05#2

Event: Nova in Sagittarius

Discovered By: William Liller, Vina del Mar Chile (IAU Circular 8559)

Discovery Magnitude: approximately 8.0 on two red photographs (85-mm camera lens + Technical Pan film + deep orange filter)

Discovery Date: July 4.049 UT

Position: (2000.0) Reported by A. C. Gilmore and P. M. Kilmartin, Mt. John Observatory (MJO), New Zealand, from an 0.4-s CCD exposure taken July 5.380 UT with the 1-m f/3.8 reflector at the University of Canterbury's MJO and measured by Gilmore using 'Astrometrica' with UCAC2 stars (IAU Circular 8559):

R.A. = 18h 17m 50.77s
Decl. = -30o 26' 31.2" (equinox 2000.0)

Spectra: A spectrum taken by Liller July 5.099 UT shows the object to be a nova.

AAVSO Chart(s): 'd' scale chart is available at:
http://www.aavso.org/cgi-bin/searchcharts3.pl?name=n%20sgr%2005%232

Report Object to the AAVSO as: 1811-30 N SGR 05#2

Observations Reported to the AAVSO: July 2.365 UT, <14.5V, ASAS-3 (reported by S. Otero, Buenos Aires, Argentina); 5.014, 7.6, R. Shida, Sao Paulo, Brazil; 5.08, 7.4 CCDV, B. Monard, Pretoria, South Africa; 5.08, 7.2 CCDRc, Monard; 5.085, 7.15 CCD, Liller; 5.1, 7.9 CCD, C. Jacques, Belo Horizonte, Brazil (IAU Circular 8559); 5.123, 7.37V, ASAS-3 (reported by Otero); 5.271, 8.0, M. Linnolt, Woodside, CA; 5.359, 8.0, J. Bedient, Hololulu, HI; 5.438, 8.1, A. Pearce, Nedlands, W. Australia; 5.74, 8.6 CCDV, Monard; 5.74, 8.1 CCDRc, Monard; 5.783, 8.5, T. Cooper, Bredell, South Africa.

Notes:
a. Nothing was visible down to about magnitude 11.0 at the location of the nova on films taken by Liller on June 12; red photographs (85-mm camera lens + Technical Pan film + deep orange filter).

b. Photoelectric photometry by Kilmartin and Gilmore with the MJO 0.6-m f/16 reflector in marginal conditions (occasional fog and low cloud crossing): July 5.408 UT, 8.15V, U-B = -0.04, B-V = +0.48, V-R = +0.38, V-I = +0.75, air mass 1.167; 5.456, 8.17V, U-B = +0.03, B-V = +0.46, V-R = +0.33, V-I = +0.67, airmass 1.064 (comparison star Cousins' E749) (IAU Circular 8559).

c. For more information on N Sgr 05#2, please see IAU Circular 8559 (ed. Daniel W. E. Green).

Congratulations to Bill on his latest discovery!

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Elizabeth O. Waagen
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