1012+41 Supernova 1999gi in NGC 3184

Active Dates: Dec. 9, 1999 – Dec. 9, 1999


Abstract:

We have been informed by the Central Bureau for Astronomical Telegrams (IAU Circular 7329 - http://cfa-www.harvard.edu/iau/cbat.html) that S. Nakano, Sumoto, Japan, reports that Reiki Kushida, Yatsugatake South Base Observatory (YSBO), Japan, discovered a supernova in NGC 3184 on Dec. 9.82 UT at unfiltered CCD magnitude 14.5, using a 0.40-m reflector. Kushida reported that nothing was visible at the location of the supernova down to magnitude 18 on CCD images obtained by her between 1994 and May 6, 1999. W. Li, University of California at Berkeley, reported that nothing was visible at the position of the supernova down to magnitude 19.0 on a KAIT image of NGC 3184 taken on Dec. 2.5 UT. A precise position of SN 1999gi, which is 3.5" west and 60.5" north of the center of the galaxy, was obtained by Y. Kushida, YSBO, from R. Kushida's CCD image and reported by Nakano (IAU Circular 7329) as: R.A. = 10h 18m 16.66s Decl.= +41 degrees 26' 28.2" (Equinox 2000.0) S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-Smithsonian Center for Astrophysics, report that A. Mahdavi and Jha obtained CCD spectroscopic observations on Dec. 10.42 UT using the F. H. Whipple Observatory 1.5-m telescope (+ FAST spectrograph) that showed that the supernova is Type II, at an early epoch (IAU Circular 7329).

Justification:

Please use this chart to observe 1012+41 SN 1999GI and report your observations to AAVSO Headquarters so we may inform the astronomical community.

Requested Data Types:

Photometry



Targets
Name Magnitude Variability Type Photometry Notes Spectroscopy Notes
SN 1999gi 14.50 SN II

Cadence: Not Specified

Precision: 100

Not Requested

Spectroscopy Lines:

No spectroscopy lines provided

Photometry Filters:

No photometry filters provided

Comparison Stars:

No comparison stars provided


Co-Authorship

Observers are not eligible for co-authorship.

Additional Observer Input:

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Forum URL

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Notes:

Principal Investigator: S. Nakano; Imported Campaign (Alert Notice #267)