British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

Home Forums Deep Sky
Terms of use

At 2020nlb - a possible Supernova in M85

7 posts / 0 new
Last post
Robin Leadbeater's picture
Offline
Last seen: 2 hours 38 min ago
Joined: 05/03/2014 - 00:50
At 2020nlb - a possible Supernova in M85
 
Caught very early (mag 17.4 last night) by ATLAS but if type Ia could perhaps reach ~mag 12 (eg SN 1960R B mag 11.7)
 
Cheers
Robin
nickjames's picture
Offline
Last seen: 1 day 13 hours ago
Joined: 12/10/2013 - 18:16
Not much brighter tonight

Robin,

M85 is getting low in a bright sky but this is an image from a few minutes ago showing the SN. It doesn't seem much brighter (Astrometrica gives 17.5 unfiltered using Gaia DR2 G and an unfiltered KAF-6303 CCD).

George Carey's picture
Offline
Last seen: 1 month 1 week ago
Joined: 30/01/2016 - 11:53
Very hard to see

Very low over my roof - first image could not see it at all.

Extremely poor seeing. Single image, 600 seconds, 10" reflector

Robin Leadbeater's picture
Offline
Last seen: 2 hours 38 min ago
Joined: 05/03/2014 - 00:50
not young but sub luminous ?

Now classified as a Ia but the classifiers suggest it could be a subluminous supernova around/post maximum light rather than  caught early.

https://wis-tns.weizmann.ac.il/object/2020nlb

It seems odd in that case though that  it was not visible to ATLAS 2 days previously

https://wis-tns.weizmann.ac.il/astronotes/astronote/2020-126

(hopefully link not mangled this time !)

Robin Leadbeater's picture
Offline
Last seen: 2 hours 38 min ago
Joined: 05/03/2014 - 00:50
on the rise

I see there is a non detection by Koichi Itagaki at >mag 18.5  20200624.570 just 16 hours before the ATLAS discovery so definitely young

https://www.flickr.com/photos/snimages/50048748781/

his latest estimate 20200626.514 is 16.1 C

https://www.flickr.com/photos/snimages/50047440476/

GraemeCoates's picture
Offline
Last seen: 1 week 6 days ago
Joined: 05/02/2019 - 20:37
Brightening

Looks like this is brightening significantly - https://www.virtualtelescope.eu/2020/06/29/supernova-sn-2020nlb-in-messier-85-is-rising-an-image-28-june-2020/ put it at Mag 14.4 (June 28.8707).

Robin Leadbeater's picture
Offline
Last seen: 2 hours 38 min ago
Joined: 05/03/2014 - 00:50
finally at maximum

It looks like it has finally reached maximum (Vmag 12.2)  3 weeks after the very early discovery. Curiously, the classification spectrum submitted to TNS has still not been made public though.