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Alert Notice 304: 1732-23 Nova Ophiuchi 2004 - possible nova in Ophiuchus

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THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
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AAVSO ALERT NOTICE 304 (April 15, 2004)

SUBJECT: 1732-23 NOVA OPHIUCHI 2004 - POSSIBLE NOVA IN OPHIUCHUS

Event: Possible nova

Announced in: IAU Circular 8323, 15 April 2004

Discovered by: Akira Takao, Kitakyushu, Japan (reported via H. Yamaoka, Kyushu University, Japan, IAUC 8323)

Discovery Magnitude: about 11.1 CCD (unfiltered) (IAUC 8323)

Discovery Date: CCD images taken Apr. 14.80 UT (IAUC 8323)

Position (equinox 2000.0):
- discovery position (Takao): R.A. = 17h 39m 00s, Decl. = -23o 28.5' (uncertainty >/= 10") (IAUC 8323).
- precise position: R.A. = 17h 38m 45.49s, Decl. = -23o 28' 18.5",
measured by K. Itagaki, Teppo-cho, Japan, from his unfiltered CCD image taken with a 0.60-m reflector on Apr. 15.684 UT (reported by S. Nakano, Sumoto, Japan, IAUC 8323).

Magnitude History:
- Nothing was visible at Takao's position on his images taken between 2002 Mar. 18 and 2004 Mar. 31 (limiting mag 11.9) (IAUC 8323).
- Nothing obvious appears near Itagaki's position on the Digitized Sky Survey.

AAVSO Chart: 'd' scale chart, based on Itagaki's position, available at

http://www.aavso.org/cgi-bin/searchcharts3.pl?name=N%20OPH%2004 [obsolete link; create charts using VSP at http://www.aavso.org/vsp ]

Report Object to the AAVSO as: 1732-23 N OPH 04

Additional Observations Reported to the AAVSO:
Apr. 14.31 UT, 10.9 V (ASAS-3 data, reported by A. Price, Watertown, MA);
Apr. 15.684, 10.2 CCD, K. Itagaki, Teppo-cho, Japan (IAUC 8323).

Spectra: none to date

Notes: The closest star in the USNO-A2.0 catalogue is a very red object (red mag 17.2) with position end figures 45.367s, 17.56" (IAUC 8323).

Congratulations to Akira Takao on his discovery!

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Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Elizabeth O. Waagen
Interim Director

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