David's Astronomy Pages (Deep Sky) Type LRN Transients

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This page documents observations and images of Type LRN Transients (Luminous Red Novae), 2020-2022 Note : Supernovae and other types of transients are documents elsewhere (Supernovae, BL Transients, LBV Transients)
LRN  Name, type, discovery date, host
AT 2021biy- Type LRN Transient (2021-01-29) in NGC 4631

AT 2021biy - Type LRN Transient  (discovered 2021-01-29) in NGC 4631

NGC 4631 with AT 2021biy (Canes Venatici) AT 2021biy (Type: LRN) discovered 2021/01/29.559 UT by ATLAS Alias: ATLAS21dfy (Discovery Note)  (Rochester Supernova site | Odd Trondal image | Nick James image | TNS 2021biy)

NGC 4631 with AT 2021biy Other galaxy in same field of view is NGC 4627 (catalog mag  +12.0)

Annotated CCD Image  (70% size, square root scale, cropped) 2 x 180s exposure (average combine), 3x3 binning, C Filter 2021-02-02 04:39 UT (#857292-94) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image (70% size, square root scale, cropped) Image details as above

NGC 4631 with AT 2021biy - Image sequence  T-2110d to T+52.6d (SN discovery, T = 2021-01-29.559)

NGC 4631 before AT 2021biy - 2015-04-21 Image below (2015-04-21) was taken 2110 days before discovery of LRN 2021biy Position of the later LRN is shown by a white circle.

Annotated CCD Image  (95% size, square root scale, cropped) 3 x 90s exposure (average combine), 3x3 binning, C Filter 2015-04-21 00:29 h UT (#585105-07) 12" LX200R  (at f/10.4) + ST-10XME

Images of AT 2021biy (NGC 4631) on Transients 2021 Page >>

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