PSN J10532275+1646349 2012 12 18.7724* 10 53 22.75 +16 46 34.9 18.6 U 19W 16N N3447 N 0
2012 12 16.736
2012 12 16.736 [18.5 K.Itagaki.
2012 12 19.6603
K. Nishiyama and F. Kabashima, Japan comfirmed position endfigures 22s74, 34"7, mag.=16.9U. using a Meade 200R 0.40-m f/9.8 reflector
2012 12 19.600
Mag.= 16.8 observed by T. Noguchi, Chiba-ken, Japan, Position end figures 22s.67, 35".3 on 16 composed frame taken by 30-s exposure each using 0.23-m f/6.3 Schmidt Cassegrain + unfiltered CCD under the limit mag.= 18.5. Position and magnitude were measured using UCAC3. An image was posted at http://park8.wakwak.com/~ngc/images/PSNinNGC3447.jpg
2012 12 20.3171
Mag.=16.3U (Tycho), Position end figures 22s.68, 34".8 (USNO-B1.0), remotely using the iTelescope T04 0.25-m f/3.4 astrograph + CCD (SBIG ST-10XME) at RAS observatory near Mayhill, NM, U.S.A. (H06). Position and magnitude were measured on an image composed from 3-frames which were taken by each 120-seconds exposure under the limiting magnitude = 18.5. Nothing is visible at this location on POSS2/UKSTU (red,1986 Dec.31, limiting mag.= 19.2). Observer T. Yusa, Osaki, Japan. Link to image: http://space.geocities.jp/yusastar77/supernova/PSNinN3447_121220.htm
2012 12 20.7239
10 53 22.69 +16 46 34.4 16.1U (Limming mag 20.1) Koichi Nishiyama Kurume Japan and Fujio Kabashima Miyaki Japan report the discovery of an possible supernova (mag 18.6) on seven unfilterd 40-s CCD frames (limmiting magnitude 20.2) taken around Dec. 18.77241UT using a 0.4-m f/9.8 relector.
2012 12 21.49225
Mag.=15.9U (Tycho), remotely using the 0.25-m f/3.4 astrograph + CCD (SBIG ST-10XME) at RAS observatory near Mayhill, NM, U.S.A. (H06). Magnitude was measured on an image composed from 3-frames which were taken by each 120-seconds exposure under the limiting magnitude = 18.0. Observer T. Yusa, Osaki, Japan. Link to image : http://space.geocities.jp/yusastar77/supernova/PSNinN3447_121220.htm#21UT
2012 12 20.677
This possible supernova in NGC 3447 was detected with 6 x 15 min image using an infrared filter Astrometry: Not done Photometry: 16.56 +/- 0.17 IR > 700 nm (R as ref) These data were collected by Joseph Brimacombe, Coral Towers Observatory, Cairns, Australia Link to image and further information http://www.flickr.com/photos/43846774@N02/8295446108/
2012 12 25.6584
Koichi Nishiyama, Kurume, Japan and Fujio Kabashima, Miyaki, Japan observe of an SN 2012ht mag 14.2U on nine unfilterd 40-s CCD frames (limiting mag 19.7) taken around 2012 Dec. 25.6584UT using a Meade 200R 0.4-m f/9.8 reflector. (+SBIG STL1001E camera).