British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

Home Forums Deep Sky
Terms of use

possible supernova in nearby NGC 5002

7 posts / 0 new
Last post
Robin Leadbeater's picture
Offline
Last seen: 57 min 41 sec ago
Joined: 05/03/2014 - 00:50
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

djswan2002's picture
Offline
Last seen: 18 hours 37 min ago
Joined: 20/04/2017 - 19:58
Thanks for flagging

About 3deg from Cor Caroli in CVn, for those who don't speak NGC or can't be bothered to look it up ;)

Tim Haymes's picture
Offline
Last seen: 20 hours 45 min ago
Joined: 13/06/2014 - 21:53
Faint but there

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

Robin Leadbeater's picture
Offline
Last seen: 57 min 41 sec ago
Joined: 05/03/2014 - 00:50
another one - SN 2020rcq in UGC 6930

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

Robin Leadbeater's picture
Offline
Last seen: 57 min 41 sec ago
Joined: 05/03/2014 - 00:50
2020qxp is also a type 1a

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

Robin Leadbeater's picture
Offline
Last seen: 57 min 41 sec ago
Joined: 05/03/2014 - 00:50
Latest magnitudes

Magnitude estimates from Odd Trondal on ISN_chat last night  SN 2020qxp ~14.5     SN 2020rcq  ~13.4

Robin Leadbeater's picture
Offline
Last seen: 57 min 41 sec ago
Joined: 05/03/2014 - 00:50
One bright, one not so much

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