Much of this data comes from CBET Circulars and occasionally more data will be provided on IAU's Astronomical Headlines page. CBET now has an M31 novae page, M33 novae page, and an M81 novae page.   An archive of the updates to this page is available.

CBET has a naming convention now for novae in M31 (now extended to Novae in M33 and M81).   This convention is YYYY-MMa, where YYYY is the year and MM is the 2-digit month of discovery, and 'a' is a lower-case letter (a, b, c, etc.) representing the order of discovery within that month.   Novae in the megellanic clouds are named with the year followed by a number.   Also, see W. Pietsch's M31 (apparent) optical nova catalogue, M33 novae catalog, and M81 novae catalog Please note that I do not keep track of galactic novae.  

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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)

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)

AT2020abjr (= XM47MZ) (= PNV J00494388+4033383), TNS discovered 2020/12/02.507 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h49m43s.880, Decl. = +40°33'38".30
Located 4730".4 east and 2550".2 south of the center of M31
Mag 18.1:12/2, Type Nova (Note: Galactic object) (References: ATEL 14269, ATEL 14266, CBAT TOCP)

archive.gif For Novae which have faded below 18th magnitude, you will have to look in the archives
Current supernovae
Other Supernovae from 2021 Other Extragalactic Novae from 2021 Unconfirmed objects from 2021
Other Supernovae from 2020 Other Extragalactic Novae from 2020 Unconfirmed objects from 2020
Supernovae from 2019 Extragalactic Novae from 2019 Unconfirmed objects from 2019

For more information in Extra galactic novae, look at the Extra Galactic Nova links on the links page.   Look at the updates page for a list of the most recent changes and additions to these pages.

Please send feedback to David Bishop dbishopx@gmail.com