Extragalactic Novae

Extragalactic Novae - 2021

Much of this data comes from IAU Circulars and occasionally more data will be provided on IAU's Astronomical Headlines page. An archive of the 2021 updates to this page is available.

SNWeb is now collecting observations on extragalactic novae. Announced Extragalactic Novae will have a link on the main page that points to this one. Please note that I do not keep track of galactic novae.

For current Novae, please see the main Extragalactic Novae page

3 supernovae TNS discovered by GSNST

AT2021zdm (= GSNST-21ef) discovered 2021/09/19.041 at R.A. = 00h43m15s.484, Decl. = +41°25'40".53 Mag 19.5:9/19, Type unknown (zhost=-0.001000) (host M31) (References: TNS)

10 supernovae TNS discovered by Zwicky Transient Facility (ZTF)

AT2021zah (= ZTF21abyzscd) discovered 2021/09/13.407 at R.A. = 00h43m01s.102, Decl. = +41°12'54".24 Mag 20.4:9/13, Type unknown (host M31) (References: TNS, ZTF observations)

AT2021uue (= ZTF21abmyeju) discovered 2021/08/01.455 at R.A. = 00h43m06s.883, Decl. = +40°58'17".43 Mag 20.8:8/1, Type unknown (host M31) (References: TNS, ZTF observations)

Nova M31 2021-11a? (= PNV J00420760+4109123), CBAT TOCP discovered 2021/11/20.587 by Zhijian Xu and Xing Gao
Found in M31 at R.A. = 00h42m07s.600, Decl. = +41°09'12".30
Located 414".0 west and 416".0 south of the center of M31
Mag 18.9:11/20, Type unknown

AT2021aeab, TNS discovered 2021/11/08.700 by J. Vinko
Found in M32 at R.A. = 00h42m45s.606, Decl. = +40°51'35".54
Located 0".0 east and 0".0 north of the center of M32
Mag 18.7:11/8, Type unknown

1 supernovae TNS discovered by David Balam

AT2022aaz discovered 2022/01/20.090 at R.A. = 00h41m31s.300, Decl. = +41°11'48".00 (host M31) Mag 17.3:1/20, Type Nova? (References: TNS)

AT2021ahrm (= XM68MZ), TNS discovered 2021/12/23.006 by Xingming Observatory Sky Survey (XOSS)
Found in M51 at R.A. = 13h29m58s.040, Decl. = +47°12'31".70
Located 0".0 east and 0".0 north of the center of M51
Mag 20.6:12/23, Type unknown

AT2021acwv (= XM60MZ) (= PNV J00425423+4116505), TNS discovered 2021/10/31.745 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m54s.230, Decl. = +41°16'50".50
Located 112".1 east and 42".1 north of the center of M31 (Hornoch image)
Mag 18.7:10/31, Type EGN (References: ATEL 15011, CBAT TOCP)

Nova M81 2021-10b? (= PNV J09553630+6903289), ATEL 14998 discovered 2021/10/22.907 by Kamil Hornoch et al.
Found in M81 at R.A. = 09h55m36s.300, Decl. = +69°03'28".90
Located 16".8 east and 26".2 south of the center of M81
Mag 18.4:10/22, Type unknown (References: CBAT TOCP)

AT2021aceg (= PSP21ac) (= PNV J00473256+3938102), TNS discovered 2021/10/25.570 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h47m32s.431, Decl. = +39°38'10".38
Located 3250".0 east and 5878".0 south of the center of M31 (Klaus Wenzel image) (Carlos Segarra image) (Carlos Segarra image)
Mag 19.0:11/14 (16.0:10/26), Type EGN (References: CBAT TOCP)

AT2021acbn (= PNV J00431453+4121099), ATEL 15003 discovered 2021/10/23.802 by A. Horti-David, K. Sarneczky, J. Vinko (Konkoly Observatory)
Found in M31 at R.A. = 00h43m14s.530, Decl. = +41°21'09".90
Located 441".0 east and 299".0 north of the center of M31 (Carlos Segarra image) (Rafael Benavides image)
Mag 17.8:10/28 (17.1:10/24), Type EGN (References: TNS, CBAT TOCP)

AT2021aaxp (= PNV J00444033+4113068), TNS discovered 2021/10/09.613 by Balam; Koichi Itagaki
Found in M31 at R.A. = 00h44m40s.320, Decl. = +41°13'07".50
Located 1308".3 east and 181".0 south of the center of M31 (Klaus Wenzel image)
Mag 17.8:10/9, Type Nova (Note: Galactic foreground nova) (References: ATEL 14962, ATEL 14963, ATEL 14969, CBAT TOCP)

Nova M81 2021-10a? (= PNV J09554017+6902478), ATEL 14949, discovered 2021/10/01.164 by Kamil Hornoch et al.
Found in M81 at R.A. = 09h55m40s.170, Decl. = +69°02'47".80
Located 37".5 east and 67".3 south of the center of M81 (Discovery image)
Mag 19.5:10/1, Type unknown (References: CBAT TOCP)

AT2021zsv, TNS discovered 2021/09/27.882 by Conjat
Found in M33 at R.A. = 01h33m40s.000, Decl. = +30°29'59".00
Located 0".0 east and 0".0 north of the center of M33 (Joseph Brimacombe image)
Mag 18.5:9/27, Type unknown

AT2021zdh (= XM58MZ) (= PNV J00424123+4114322), ATEL 14956 discovered 2021/09/18.608 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m41s.230, Decl. = +41°14'32".20
Located 34".9 west and 96".3 south of the center of M31 (Discovery image)
Mag 18.4:9/18, Type unknown (References: TNS, CBAT TOCP)

AT2021zdn (= GSNST-21cg), TNS discovered 2021/09/19.041 by GSNST
Found in M31 at R.A. = 00h42m38s.730, Decl. = +41°08'44".80
Located 63".1 west and 443".7 south of the center of M31
Mag 20.7:9/19, Type unknown (zhost=-0.001000)

AT2021yut (= ZTF21acbwtap), TNS discovered 2021/09/13.407 by Zwicky Transient Facility (ZTF)
Found in M31 at R.A. = 00h40m40s.554, Decl. = +40°50'03".55
Located 1400".1 west and 1565".0 south of the center of M31
Mag 20.6:9/13, Type unknown (References: ZTF observations)

AT2021yul (= PSP21J) (= ZTF21acbutpl), TNS discovered 2021/09/13.740 by Xingming Observatory Sky Survey (XOSS)
Found in M110 at R.A. = 00h40m45s.586, Decl. = +41°45'20".01
Located 0".0 east and 0".0 north of the center of M110
Mag 18.9:10/4 (16.4:9/15), Type Nova (References: ZTF observations)

AT2021ytf (= ZTF21acadghz), TNS discovered 2021/09/07.387 by Zwicky Transient Facility (ZTF)
Found in M31 at R.A. = 00h42m08s.888, Decl. = +40°54'01".21
Located 400".6 west and 1327".3 south of the center of M31
Mag 20.5:9/7, Type unknown (References: ZTF observations)

AT2021ypo (= PSP21I) (= PNV J00432258+4119025) (= ZTF21acbcfmh), TNS discovered 2021/09/11.602 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h43m22s.580, Decl. = +41°19'02".50
Located 431".2 east and 174".0 north of the center of M31 (Discovery images)
Mag 18.7:10/4 (16.3:9/13), Type EGN (References: CBAT TOCP, ZTF observations)

AT2021ypn (= PSP21H) (= PNV J00424297+4117574), ATEL 14956 discovered 2021/09/11.602 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m42s.970, Decl. = +41°17'57".40
Located 15".3 west and 108".9 north of the center of M31 (Discovery image) (Dicovery images)
Mag 17.0:9/11, Type FeII (References: TNS, ATEL 14922, ATEL 14919, ATEL 14913, CBAT TOCP)

AT2021xwh (= GSNST-21bx), TNS discovered 2021/09/02.957 by GSNST
Found in M31 at R.A. = 00h43m28s.760, Decl. = +41°21'42".60
Located 500".6 east and 334".1 north of the center of M31
Mag 20.5:9/2, Type unknown (zhost=-0.001000)

AT2021yem (= Gaia21edp), TNS discovered 2021/09/05.938 by Gaia Photometric Science Alerts programme
Found in LMC at R.A. = 05h15m30s.170, Decl. = -70°27'35".06
Located 2472".1 west and 2533".1 south of the center of LMC
Mag 15.6:9/5, Type unknown (References: Gaia observations)

Nova M31 2021-08a? (= PNV J00394278+4135145), CBAT TOCP discovered 2021/08/21.919 by Kamil Hornoch et al.
Found in M31 at R.A. = 00h39m42s.780, Decl. = +41°35'14".50
Located 2042".0 west and 1146".0 north of the center of M31 (Discovery image)
Mag 16.4:8/21, Type MP (= (5234) Sechenov) (References: ATEL 14867)

AT2021wnx (= ZTF19abobdrj), TNS discovered 2021/08/16.430 by Zwicky Transient Facility (ZTF)
Found in M31 at R.A. = 00h42m28s.483, Decl. = +41°26'52".28
Located 0".0 east and 0".0 north of the center of M31
Mag 20.4:8/16, Type unknown (References: ZTF observations)

AT2021wjl (= ZTF21absjpej), TNS discovered 2021/08/12.448 by Zwicky Transient Facility (ZTF)
Found in M33 at R.A. = 01h34m25s.807, Decl. = +30°55'18".85
Located 0".0 east and 0".0 north of the center of M33
Mag 20.9:8/12, Type unknown (References: ZTF observations)

AT2021wfc (= ZTF21abturbi), TNS discovered 2021/08/17.452 by Zwicky Transient Facility (ZTF)
Found in M33 at R.A. = 01h35m01s.945, Decl. = +30°43'19".85
Located 0".0 east and 0".0 north of the center of the M33
Mag 19.6:8/17, Type unknown (References: ZTF observations)

AT2021vgi (= Gaia21drq) (= M31N 2021-08a), TNS discovered 2021/08/09.033 by Conjat
Found in M31 at R.A. = 00h42m39s.583, Decl. = +41°09'02".81
Located 53".7 west and 424".0 south of the center of M31
Mag 19.0:8/9, Type EGN (Recurrent) (References: ATEL 14862, ATEL 14853, ATEL 14842, Gaia observations; Nova M31N 2009-11b)

AT2021urk (= XM56MZ) (= Gaia21drr), TNS discovered 2021/07/26.874 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m45s.346, Decl. = +41°52'22".63
Located 12".4 east and 2174".8 north of the center of M31
Mag 16.8:8/9, Type EGN (References: CBAT TOCP, Gaia observations)

Nova M31 2021-07d? (= PNV J00420058+4108483), CBAT TOCP discovered 2021/07/24.877 by Zhijian Xu and Xing Gao
Found in M31 at R.A. = 00h42m00s.580, Decl. = +41°08'48".30
Located 493".2 west and 440".2 south of the center of M31
Mag 20.1:7/24, Type unknown

AT2021wcf (= Gaia21duh) (= Nova M33 2021-07a?) (= TCP J01333854+3035364), CBAT TOCP discovered 2021/07/20.704 by Koichi Itagaki
Found in M33 at R.A. = 01h33m38s.540, Decl. = +30°35'36".40
Located 160".0 west and 240".0 south of the center of M33 (Nick James image)
Mag 18.4:8/12 (17.5:7/20), Type unknown (References: Gaia observations)

AT2021scd (= ZTF21abjiotr), TNS discovered 2021/07/04.392 by Zwicky Transient Facility (ZTF)
Found in M31 at R.A. = 00h42m17s.928, Decl. = +41°00'18".63
Located 298".2 west and 949".9 south of the center of M31
Mag 18.3:7/6, Type EGV (References: ATEL 14784, ZTF observations)

AT2021scc (= XM55MZ), TNS discovered 2021/07/04.812 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m47s.200, Decl. = +41°18'17".50
Located 31".1 east and 128".8 north of the center of M31 (Hornoch dicovery image)
Mag 17.1:7/4, Type unknown (References: ATEL 14760, ATEL 14762)

AT2021rno (= PSP21B) (= MASTER OT J004238.15+410841.0), TNS discovered 2021/07/02.758 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m38s.045, Decl. = +41°08'41".32
Located 70".9 west and 447".2 south of the center of M31
Mag 17.5:7/2, Type Nova (= recurrent nova) (References: ATEL 14755, ATEL 14750, ATEL 14762; Nova Nova M31 2012-01b)

Nova M31 2021-07a? (= PNV J00424717+4118173), CBAT TOCP discovered 2021/07/04.033 by Kamil Hornoch et al.
Found in M31 at R.A. = 00h42m47s.170, Decl. = +41°18'17".30
Located 32".0 east and 129".0 north of the center of M31
Mag 17.6:7/4, Type unknown (References: ATEL 14762, ATEL 14753)

AT2021poc (= PNV J00425897+4118085) (= MASTER OT J004258.92+411807.5), ATEL 14702 discovered 2021/06/12.062 by Kamil Hornoch et al.
Found in M31 at R.A. = 00h42m58s.970, Decl. = +41°18'08".50
Located 165".1 east and 120".0 north of the center of M31 (Discovery image) (Master discovery image)
Mag 16.6:6/12, Type unknown (Recurrent Nova) (References: TNS, ATEL 14703, ATEL 14716, ATEL 14762, CBAT TOCP)

AT2021pap (= XM54MZ) (= PNV J00430587+4115480), ATEL 14682 discovered 2021/06/06.837 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h43m05s.870, Decl. = +41°15'48".00
Located 243".2 east and 20".3 south of the center of M31 (Discovery image)
Mag 17.4:6/6, Type unknown (References: ATEL 14716, ATEL 14762, TNS, CBAT TOCP)

AT2021nzz (= DLT21o), TNS discovered 2021/06/01.042 by DLT40
Found in NGC 5068 at R.A. = 13h18m56s.590, Decl. = -21°02'38".11
Located 24".9 east and 17".3 south of the center of NGC 5068
Mag 18.7:6/1, Type Nova (zhost=0.002235)

17 supernovae GAIA page discovered by Gaia Photometric Science Alerts programme

AT2021nrt (= Gaia21coh) discovered 2021/05/27.663 at R.A. = 04h54m20s.775, Decl. = -69°24'38".16 Mag 17.3:5/27, Type unknown (host LMC) (References: TNS, Gaia observations)

Nova M81 2021-05a? (= PNV J09553378+6904293), CBAT TOCP discovered 2021/05/22.859 by Kamil Hornoch et al.
Found in M81 at R.A. = 09h55m33s.780, Decl. = +69°04'29".30
Located 3".3 east and 34".2 north of the center of M81 (Discovery image)
Mag 19.6:5/22, Type unknown (References: ATEL 14656)

AT2021jwr (= XM53MZ) (= PNV J00424656+4114263), TNS discovered 2021/04/16.919 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m46s.560, Decl. = +41°14'26".30
Located 25".3 east and 102".2 south of the center of M31 (Discovery image)
Mag 18.0:4/16, Type unknown (References: ATEL 14716, ATEL 14762, CBAT TOCP)

AT2021fbz (= PNV J00434013+4127123) (= XN03JR), CBAT TOCP discovered 2021/03/08.397 by Koichi Itagaki
Found in M31 at R.A. = 00h43m40s.180, Decl. = +41°27'12".60
Located 629".8 east and 664".1 north of the center of M31 (Discovery image) (XOSS discovery image) (Hornoch discovery image) (Claudio Balcon image)
Mag 16.1:3/8, Type EGN (Claudio Balcon spectrum) (References: ATEL 14447, ATEL 14449, TNS)

Nova M31 2021-03a? (= PNV J00423449+4117298) (= XM52MZ), CBAT TOCP discovered 2021/03/01.558 by Zhijian Xu and Xing Gao
Found in M31 at R.A. = 00h42m34s.490, Decl. = +41°17'29".80
Located 110".8 west and 81".3 north of the center of M31 (Discovery image)
Mag 18.3:3/1, Type unknown

AT2021dhg (= ZTF21aalcrjh), TNS discovered 2021/02/15.402 by Zwicky Transient Facility (ZTF)
Found in M64 at R.A. = 12h56m47s.701, Decl. = +21°38'52".75
Located 56".6 east and 125".9 south of the center of M64 (Giancarlo Cortini image) (Koichi Itagaki image) (Enrico Prosperi image unconfirmed)
Mag 18.8:2/21 (18.7:2/20), Type EGN (zhost=0.001361) (References: ZTF observations; SN AT2019txw, AT2018kkt)

AT2021dcd (= XM51MZ) (= PNV J00420424+4042336) (= ZTF21aamauao), TNS discovered 2021/02/16.575 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m04s.240, Decl. = +40°42'33".60
Located 451".9 west and 2014".9 south of the center of M31 (Andrea Mantero image)
Mag 17.2:2/20 (16.5:2/17), Type FeII (References: ATEL 14412, CBAT TOCP, ZTF observations)

AT2021clj (= XN02JR) (= Nova M31 2021-02b?) (= PNV J00424827+4119374) (= ZTF21aajzhgk), CBAT TOCP discovered 2021/02/09.549 by Zhijian Xu and Xing Gao
Found in M31 at R.A. = 00h42m48s.270, Decl. = +41°19'37".40
Located 45".0 east and 209".0 north of the center of M31
Mag 18.0:2/9, Type EGN (References: ATEL 14423, TNS, ZTF observations, Antares observations)

AT2021boa (= XM50MZ) (= PNV J00434645+4133408) (= ATLAS21dvl), TNS discovered 2021/02/03.580 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h43m46s.404, Decl. = +41°33'40".40
Located 7000".5 east and 1052".3 north of the center of M31 (Discovery page)
Mag 17.9:2/7 (16.8:2/3), Type FeII (References: ATEL 14370, CBAT TOCP)

10 supernovae PS1 SN page discovered by PS1 Science consortium

AT2021bgj (= PS21ua) discovered 2021/01/16.286 at R.A. = 04h27m01s.761, Decl. = -20°48'06".23 Mag 20.7:1/16, Type unknown (host LMC) (References: TNS)

AT2021bfs (= PNV-OMB15) (= PNV J00425220+4116246) (= ZTF21aagkzmc), TNS discovered 2021/01/26.720 by Flavio Castellani, Raffaele Belligoli and Claudio Marangoni (ISSP)
Found in M31 at R.A. = 00h42m52s.200, Decl. = +41°16'24".60
Located 92".0 east and 19".0 north of the center of M31 (Discovery image) (Paolo Campaner image)
Mag 16.6:2/11 (16.1:1/31), Type FeII (References: ATEL 14370, CBAT TOCP, ZTF Observations)

AT2021bl (= XM48MZ) (= PNV J01332200+3033012), TNS discovered 2021/01/03.688 by Xingming Observatory Sky Survey (XOSS)
Found in M33 at R.A. = 01h33m22s.000, Decl. = +30°33'01".20
Located 373".0 west and 395".6 south of the center of M33 (Discovery image)
Mag 21.1:1/9 (17.9:1/3), Type FeII (z=-0.001) (References: ATEL 14355, CBAT TOCP)

Latest Supernovae	Latest Extragalactic Novae
Supernovae from 2021		Unconfirmed objects from 2021
Supernovae from 2021	Extragalactic Novae from 2021	Unconfirmed objects from 2021
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