possible supernova in nearby NGC 5002
Sat, 2020-08-08 11:57
#1
possible supernova in nearby NGC 5002
The ASAS-SN team report a possible supernova ASASSN-20jq/ AT2020qxp in NGC 5002 (12Mpc) https://wis-tns.weizmann.ac.il/object/2020qxp It is currently mag 16.8 and yet to be classified but a type Ia would be expected to reach ~mag 11 excluding extinction at this distance so one to watch! Robin |
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About 3deg from Cor Caroli in CVn, for those who don't speak NGC or can't be bothered to look it up ;)
I imaged the galaxy through thin cloud - on Aug 9th at 2100UT. Despite the poor transparency the stacked subs indicate the transient at about 16.5 mag. (C11 at f5.5, QHY174m)
Tim
A bit closer still, same part of the sky (unfortunately). Confirmed as a 1a. Rising rapidly, heading for ~mag 11 ?
https://wis-tns.weizmann.ac.il/object/2020rcq
Robin
SN 2020qxp is now also confirmed as a Ia and the classifiers suggest it should be near maximum light in which case it should in theory be approaching ~mag 11 excluding extinction in the parent galaxy. They also compare it though with SN 2007on which was classed as "transitional" (ie with a luminosity lower than normal for a 1a but more luminous than sub luminous 91bg-types). SN 2007on was considered a good candidate for a white dwarf merger supernova event eg
https://arxiv.org/abs/1802.09469
The light curve of SN 2020qxp could be interesting
Cheers
Robin
Magnitude estimates from Odd Trondal on ISN_chat last night SN 2020qxp ~14.5 SN 2020rcq ~13.4
Estimates from Stan Howerton last night give SN 2020rcq 12.5 V so still rising but SN 2020qxp at 14.5 so probably sub-luminous near maximum as suggested by the TNS classifiers
https://www.flickr.com/photos/146026104@N07/50246735516