Supernova 2002an in NGC 2575
This page is devoted to information on Supernova 2002an in NGC 2575 Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page.  Information on the original web pages for many of these images can be found on the updates and links web pages.
Discovered by Japanese amateur
This supernova was found on the rise.
We have a DSS Photometry reference image made by Odd Trondal.
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. Times and dates are in UT unless otherwise noted. If you know of any others, please tell me!
|Discovery image||2002/01/22.522||16.1||C||Discovery, local mirror|
|Pepe Manteca image||2002/01/24.957||15.6||C|
|Rafael Ferrando image||2002/01/26.892||15.5||C|
|Esteban Reina Lorenz||2002/01/26.969||15.6||C|
|Zorko Vičar and Matija Kastelic image||2002/01/30.937||15.7||C|
|Yasuo Sano image||2002/01/31.425||16.0||C|
|Rezman Obs image||2002/02/01.858||C||local mirror|
|Josch Hambsch image||2002/02/03.012||15.5||C|
|Yasuo Sano image||2002/02/06.475||16.13||C|
|JM Llappaset image||2002/02/08.036||16.1||CR|
|Esteban Reina Lorenz image||2002/02/09.920||16.1||C||w/ asteriod 1995 AJ1|
|Yasuo Sano image||2002/02/11.522||16.35||CR|
|JM Llappaset image||2002/02/11.836||16.2||CR|
|Yasuo Sano image||2002/02/13.413||16.35||CR|
|Fred Ewalt image||2002/02/15.090||16.38||C|
|Yasuo Sano image||2002/02/16.431||16.40||CR||Shows the evolution of this supernova|
|JB DE Vanssay image||2002/02/18.992||16.3||CR|
|Yasuo Sano image||2002/02/19.609||16.47||CR||Shows the evolution of this supernova|
|JM Llappaset image||2002/02/20.089||16.5||CR|
|JM Llappaset image||2002/03/03.880||16.5||CR|
|JB. De Vanssay image||2002/03/04.933||16.3||CR|
|Yasuo Sano image||2002/03/05.556||16.61||CR||Shows the evolution of this supernova|
|R Poncy image||2002/03/08.798||16.4||CR|
|JM Llappaset image||2002/03/08.834||16.3||CR|
|E. Barbotin image||2002/03/09.840||16.5||CR|
|D. Lefoulon image||2002/03/09.973||16.5||CR|
|R Poncy image||2002/03/10.807||16.4||CR|
|JM Llappaset image||2002/03/10.809||16.4||CR|
|R Poncy image||2002/03/12.921||16.3||CR|
|E. Barbotin image||2002/03/25.205||16.7||CR|
|Yasuo Sano image||2002/03/31.471||16.94||CR|
|J.B. De Vanssay image||2002/04/08.883||17.2||CR|
|Yasuo Sano image||2002/05/04.492||18.12||CR|
I would like to announce my discovery of a possible supernova in NGC 2575.
The new object was discovered on six frames with 30 seconds exposured on Jan. 22.52 UT using 0.28-cm f/6.3 Schmidt-Cassegrain telescope and a CCD. The limiting magnitude was around 17.5. The unfilltered CCD magnitude of the new object was 16.06, and it is located 7".4 south and 38".3 east from the galaxy center.
No star was found at the corresponding position on two frames on 1999 Feb. 16 and 2001 Jan. 4 (limiting magnitude 17.5). The object has been checked against known minor planets. No appreciable motion was detected during the 16 min observation. Further observations are encourgaed.
The report has been sent to the CBAT. I will send an image of the new object to vsnet-sn-chart.
discovery by Yasuo Sano. Nayoro Hokkaido Japan
Dear SN watchers,
As IAUC 7805 reported, a Japanese amateur Yasuo Sano discovered his second supernova (first was "hypernova" SN 1997ef) in the nearby galaxy. It can reach mag 15.4.
SN 2002an was discovered on Jan. 22.52 UT, when its unfiltered red magnitude was 16.04 (private communication). It was quickly confirmed by Reiki Kushida on Jan 22.64 UT, but the announcement delayed until Jan. 24.94 UT. The position of this new object is: R.A. = 8h22m47s.76, Decl. = +24o17'41".7 (2000.0), which is about 38" east and 7" south of the nucleus of a face-on open spiral (SA(rs)cd) galaxy NGC 2575. It locates at the outermost of the disk.
There are several foreground stars superimposed and around the galaxy. A mag 15 star exists 33" due south of the nucleus of NGC 2575. Also, a mag 15 star at 20" WNW and 67" WNW of the nucleus, the opposite side than SN.
NGC 2575 is somewhat nearby galaxy. The expected maximum for typical SN Ia in this galaxy is mag about 15.4, taking account of the Galactic extinction. Kushida notes that it become slightly (0.1 mag) brighter on Jan. 24.729, and nothing was visible on Jan. 6 (limiting mag 18.5). If it is of type Ia, it would be some days before maximum light. Followup photometry and the earlier spectral classification is urged.
Hitoshi Yamaoka, Kyushu Univ., Japan