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This page documents observations and images of LBV Transients (Luminous Blue Variables), 2020-2021 LBV's are massive unstable supergiant stare, also known as S Doradus variables P Cygni is an example of LBV from our own galaxy Note : Luminous Red Nova are documented elsewhere (LRN Transients)
LBV  Name, type, discovery date, host
LBV 2019abn - LBV Transient (2019-02-20) in M51 LBV 2000ch - LBV Transient (2019-02-24) in NGC 3432, 2019 Outburst LBV 2019udc - LBV Transient (2019-11-04) in NGC 718 LBV 2021blu -  LBV Transient (2021-02-01) in UGC 5829

LBV 2019abn - LBV Transient (discovered 2019-02-20) in M51

LBV 2019abn in M51 (Canes Venatici) LBV 2019abn discovered 2019/01/22.555 by ATLAS ( See LBV 2019abn images sub-page on Rochester Supernova site ) Image below (2019-02-20.990) was taken 29.4 days after discovery LBV's are massive unstable supergiant stare, also known as S Doradus variables P Cygni is an example of LBV from our own galaxy

Annotated CCD Image (50% size, linear scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2019-02-20 23:45 UT (#665168-72) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

LBV 2019abn - Detail

Annotated CCD Image (100% size, linear scale, cropped) Image details as above

M51 Detail - Earlier Image (2008) No sign of any object at the position of the later LBV

CCD Image (184% size, linear scale, cropped) 5 x 180s exposure (av. combine), 2x2 binning, C Filter 2008-02-27 23:59 UT (#270263-69) 8" LX200 Classic + ST-7E

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LBV 2000ch - LBV Transient (outburst discovered 2019-02-24) in NGC 3432

NGC 3432 (Leo Minor)

CCD Image (50% size) 2 x 180s exposure (average combine), 3x3 binning, C Filter 2019-02-26 21:24 UT (#669142-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3432 - Detail

CCD Image (100% size, cropped) Image details as above

LBV 2000ch in NGC 3432 LBV 2000ch is a Luminous Blue Variable (LBV) in the galaxy NGC 3432, about 30 million light-years from Earth. 2000ch was discovered 2000-05-03.20 (May 2000), when it was found by the LOSS survey at magnitude +17.4.  ( Rochester Supernova site |  2000ch subpage | Original LOSS Discovery Image (2000) |  K. Itagaki image (2019) ) Initially thought to be a nova in our own galaxy, it was reclassified as a subluminous type IIn supernova when its true distance was determined. Unexpectedly, it reappeared in 2013, showing that 2000ch is not a supernova but most probably an Eta Carinae type star that is undergoing a series of outbursts.  Further outbursts occured in April 2014, January 2017 and February 2018. It was found again in outburst on 2019-02-24.50 by K. Itagaki  at magnitude +17.9. LBV 2000ch is show in images below (2019-02-26.89 ) by the black cross-hairs. Image taken 2.4 days after outburst discovery

Negative CCD Image(100% size, cropped) 2 x 180s exposure (average combine), 3x3 binning, C Filter 2019-02-26 21:24 UT (#669142-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3432 - Wider View

CCD Image (50% size) Image details

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LBV 2019udc - LBV Transient (discovered 2019-11-04) in NGC 718

NGC 718 with LBV 2019udc (Pisces) LBV AT2019udc discovered 2019/11/04.135 by DLT 40

Annotated CCD Image (100% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, C Filter 2019-11-18 20:24 UT (#723171-73) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 718 - Wider View

CCD Image (50% size, square root scale) 3 x 180s exposure (average combine), 3x3 binning, C Filter 2019-11-18 20:24 UT (#723171-73) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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LBV 2021blu -  LBV Transient (discovered 2021-02-01) in UGC 5829

UGC 5829 with LBV 2021blu (Leo Minor) AT2021blu (Type: LBV) discovered 2021/02/01.467 UT by ATLAS Alias: ATLAS21dic, ZTF21aagppzg  [ Irregular Galaxies ] LBV is indicated by white cross-hairs

Annotated CCD Image  (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-02-11 03:03 UT (#858205-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 5829 with LBV 2021blu - 2021-02-11 (T+9.7d) Image below (2021-02-11.120) was taken 9.7 days after discovery of 2021blu LBV is indicated by white cross-hairs. Measured magnitude +16.4

Annotated CCD Image  (100% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-02-11 03:03 UT (#858205-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image  (100% size, square root scale, cropped) Image details as above

UGC 5829 - 2022-01-01 (T+334.5d) Image below (2022-01-01.938) was taken 334.5 days after discovery of 2021blu Position of earlier LBV (no longer visible) is indicated by white cross-hairs.

Annotated CCD Image  (100% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, C Filter 2022-01-01 22:41 UT (#947132-36) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of LBV 2021blu  (UGC 5829) on Transients 2021 Page >>

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