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Alert Notice 320: 1811-30 Nova Sagittarii 2005 No. 2

July 5, 2005

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  [obsolete link; create charts using VSP at http://www.aavso.org/vsp ]

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!

Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Elizabeth O. Waagen
Senior Technical Assistant

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