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AAVSO ALERT NOTICE 337  (April 6, 2006)

SUBJECT: 2107+44 V2362 CYGNI = NOVA CYGNI 2006

Event: Nova in Cygnus

Discovered By: Hideo Nishimura, Miyawaki, Kakegawa, Japan (reported by S. Nakano, Sumoto, Japan) (IAU Circular 8697)

Discovery Magnitude: photographic magnitude 10.5, T-Max 400 film (IAU Circular 8697)

Discovery Date: April 2.80667 UT (IAU Circular 8697)

Position: provided by Richard Miles, Stourton Caundle, Dorset, England, from his image taken Apr. 04.9947 UT

R.A. (2000): 21h 11m 32.34s
Decl. (2000): +44o 48' 03.9"

AAVSO Chart(s): 'd' and 'dr' scale charts are available at http://www.aavso.org/cgi-bin/searchcharts3.pl?name=n%20cyg%2006

Report Object to the AAVSO as: 2107+44 V2362 CYG

How to Observe: visually or photometrically (V, Rc, or Ic filter)

Observations Reported to the AAVSO:

Mar. 23 UT, <12 photographic (T-Max 400), H. Nishimura, Miyawaki,
Kakegawa, Japan (via S. Nakano, IAU Circular 8697);
Apr. 02.80667, 10.5 photographic (Nishimura, IAU Circular 8697);
04.91228, 7.78 +/-0.1 R-mag (unfiltered CCD that has a near-red
response) (comp star GSC 03181-01159), G. Klingenberg, Baasmoen,
Norway;
04.9947, 8.5 V +/-0.3, R. Miles, Stouton Caundle, Dorset, England;
05.0073, 8.319 V +/-0.007, Miles;
05.0113, 8.324 V +/-0.006, Miles;
05.0152, 8.317 V +/-0.007, Miles;
05.0192, 8.324 V +/-0.007, Miles;
05.0231, 8.327 V +/-0.007, Miles;
05.0270, 8.316 V +/-0.008, Miles;
05.0310, 8.324 V +/-0.009, Miles;
05.0364, 8.308 V +/-0.008, Miles;
05.0404, 8.329 V +/-0.008, Miles;
05.0444, 8.316 V +/-0.008, Miles;
05.0483, 8.321 V +/-0.005, Miles;
05.0519, 8.318 V +/-0.003, Miles;
05.0550, 8.323 V +/-0.004, Miles;
05.0609, 8.316 V +/-0.005, Miles;
05.0637, 8.325 V +/-0.005, Miles;
05.0665, 8.312 V +/-0.007, Miles;
05.0693, 8.316 V +/-0.009, Miles;
05.0721, 8.305 V +/-0.008, Miles;
05.0749, 8.305 V +/-0.007, Miles;
05.0777, 8.297 V +/-0.004, Miles;
05.0805, 8.305 V +/-0.004, Miles;
05.0832, 8.304 V +/-0.003, Miles;
05.0862, 8.305 V +/-0.003, Miles;
05.0888, 8.302 V +/-0.003, Miles;
05.0916, 8.304 V +/-0.003, Miles;
05.0944, 8.297 V +/-0.003, Miles;
05.0972, 8.301 V +/-0.005, Miles;
05.0999, 8.298 V +/-0.006, Miles;
05.1027, 8.290 V +/-0.006, Miles;
05.1055, 8.309 V +/-0.005, Miles;
05.1083, 8.305 V +/-0.005, Miles;
05.1111, 8.304 V +/-0.004, Miles;
05.1139, 8.301 V +/-0.004, Miles;
05.28912, 8.239 V +/-0.014 (compstar GSC 3181-1159 = 9.68V), R. Huziak,
Saskatoon, Saskatchewan;
05.28995, 8.216 V +/-0.012, Huziak;
05.29078, 8.254 V +/-0.012, Huziak;
05.29161, 8.254 V +/-0.025, Huziak;
05.29243, 8.246 V +/-0.019, Huziak;
05.29409, 8.240 V +/-0.029, Huziak;
05.4271, 8.5: (film; comp star mags from TheSky), D. West, Mulvane, KS;
05.4352, 8.331 V +/-0.013, S. Dvorak, Clermont, FL;
05.4361, 8.319 V +/-0.005, Dvorak;
05.4597, 8.285 V +/-0.004, T. Crawford, Portland, OR;
05.79, 7.9 ptg, Nishimura (IAU Circular 8698);
05.9020, 8.5, B. Granslo, Fjelhammar, Norway;
05.97, 8.5, M. Reszelski, Szamotuly-Galawo, Poland;
06.1250, 8.2, G. Poyner, Birmingham, England;
06.1597, 7.8, A. Kammerer, Malsch, Germany;
06.1653, 8.1, M. Biesmans, Essen, Belgium;
06.3160, 8.1. M. Komorous, London, Ontario, Canada;
06.4222, 8.0, C. Chiselbrook, Marietta, GA.

Spectra: Low-resolution spectra obtained about Apr. 05.8 UT by several Japanese observers, including K. Kinugasa, H. Naito and S. Ozaki, and M. Fujii, and reported by H. Yamaoka in IAU Circular 8698, indicate a classical nova discovered slightly before maximum, with some interstellar reddening.

Notes:
a. Confirmed by Richard Miles, Stourton Caundle, Dorset, England.
b. Nishimura reports nothing visible down to magnitude 12 on films back to October 2001, and provides the following position: R.A. 21:11:32 Decl. +44:48:02 (2000.0) (IAU Circular 8697).
c. Geir Klingenberg, Baasmoen, Norway, provides the following precise position from his image taken April 4: RA 21:11:32.36 Decl +44:48:03.3 (2000.0).
d. Miles reports nothing was visible on DSS-2 at the position of the nova, and that the nova is not the red star noted by Yamaoka (see Note e).
e. H. Yamaoka, Kyushu University, Japan, notes that a mag ~14 very red star in several star catalogues has position end figures about 31.9s, 03.3" (IAU Circular 8697).
f. Miles reports that 33 simultaneous 2-color photometric measurements made with 0.06-m refractors show that at Apr. 05.07 UT the nova was brightening by 0.25 +/-0.03 magnitude/day and becoming redder in (V-Ic) at the rate of 0.10 +/-0.04 magnitude/day. His first and last observations are Apr 05.0073, 8.319 V, (V-Ic)=0.793; Apr 05.6139, 8.301 V, (V-Ic)=0.813.
g. Nikolai N. Samus, Russian Academy of Sciences, announced that Nova Cyg 2006 has been assigned the name V2362 Cyg (IAU Circular 8698).
h. A page on V2362 Cyg will be created on the AAVSO website. Observers are invited to post images and other related materials there.
i. Previously announced in AAVSO Special Notice #10 (April 4, 2006), prepared by Aaron Price.
j. For more information, see the announcements in International Astronomical Union (IAU) Circular Nos. 8697 and 8698, Daniel E. W. Green, Ed.

Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Elizabeth O. Waagen
Senior Technical Assistant

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