This page is devoted to information on Supernova 1999br in NGC 4900. Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main supernova page. Information on the original web pages for many of these images can be found on the Supernova links web page.
1999br is yet another discover by the Lick Observatory Supernova Search team. Note that there is a very bright foreground star (mag about 11.3) located near the position of Supernova 1999br
Web pages dedicated to this SN.
The following is a list of images of this SN, in chronological order.
Click on the name in the "observer" column to see the image.
If you know of any others, please tell me!
|Kereszty Zsolt||4/14/99 19:58 UT||17.6||C|
|DAX Observatory||4/15/99 23:20 UT||C|
|Mario Hamuy image||undated||C|
|S. Massaro||4/19/99 23:05 UT||C||FITS version|
|Jose Mª Bosch||4/21/99||C|
|Arno van Werven||4/21.340/99||C|
|Arno van Werven||4/22.184/99||C|
Light curves and Spectra:
from [vsnet-alert 2870] SN 1999br in NGC 4900
Dear SN watchers,
Today, IAUC 7141 and 7142 informed that 3 new supernovae are discovered. Among them, two are remarkably nearby objects and will potentially become bright.
The (probably) nearest one is SN 1999br, which are discovered by LOSS team with KAIT. It was found on Apr. 12.4 and confirmed on Apr. 13.2, when it was about 17.5 mag on both epoch. Its location is: R.A. = 13h00m41s.80, Decl. = +2o29'45".8 (2000.0), which is about 40" east and 19" south from the core of the host galaxy NGC 4900. Note that there is a foreground star (GSC0029800001 = U0900_07334738, GSC mag = 11.29, USNO r_mag = 11.3), from which the supernova is about 12" east and 16" north.
The host galaxy NGC 4900 has a rather peculiar appearance. Although it is classified as SBc galaxy, the spiral arm is not clearly seen on DSS1 image. It has somewhat spherical shape with many bright blobs, which apparently resembles with a planetary nebula. The SN locates near to the edge of the most east-southeastern blob in the outermost region of the galaxy's disk.
The distance of NGC 4900 is comparable to the Virgo cluster, which means that the typical SNeIa on this galaxy would be 12 mag or so on their maximum. Even if it is the gravitational-collapse driven supernova, the maximum brightness is expected as 14 mag or so (of course without the absorption by the circumstellar and interstellar medium of the host galaxy). Followup observation is extremely encouraged.
Hitoshi Yamaoka, Kyushu Univ., Japan