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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Nova M31 2020-04e? (= PNV J00420852+4106147), CBAT TOCP discovered 2020/04/26.102 by Kamil Hornoch et al.
Found in M31 at R.A. = 00h42m08s.520, Decl. = +41°06'14".70
Located 404".2 west and 593".8 south of the center of M31 (Discovery image)
Mag 16.8:4/26, Type unknown

Nova M81 2020-04a? (= PNV J09555057+6903533), ATEL 13659 discovered 2020/04/23.818 by Kamil Hornoch et al.
Found in M81 at R.A. = 09h55m50s.570, Decl. = +69°03'53".30
Located 93".2 east and 1".8 south of the center of M81 (Discovery image)
Mag 20.4:4/23, Type unknown (References: CBAT TOCP)

Nova M31 2020-03d? (= PNV J00431438+4116290), ATEL 13585 discovered 2020/03/23.781 by Kamil Hornoch Hana Kucakova, Marek Wolf
Found in M31 at R.A. = 00h43m14s.380, Decl. = +41°16'29".00
Located 338".8 east and 20".5 north of the center of M31 (Discovery image)
Mag 15.8:3/23, Type unknown (References: CBAT TOCP)

Nova M81 2020-03b? (= PNV J09561048+6902273), ATEL 13584 discovered 2020/03/22.952 by Kamil Hornoch et al.
Found in M81 at R.A. = 09h56m10s.480, Decl. = +69°02'27".30
Located 200".1 east and 87".8 south of the center of M81 (Discovery image)
Mag 19.9:3/22, Type unknown (References: CBAT TOCP)

AT2020end, TNS discovered 2020/03/15.803 by Matthieu Conjat
Found in M82 at R.A. = 09h55m27s.100, Decl. = +69°37'46".00
Located 133".6 west and 179".8 south of the center of M82 (Discovery image) (Marc Serrau image) (Matthieu Conjat image)
Mag 19.8:3/15, Type unknown (zhost=0.000660)

AT2020enc (= XM28MZ), TNS discovered 2020/03/16.748 by Xingming Observatory Sky Survey (XOSS)
Found in M82 at R.A. = 09h55m32s.630, Decl. = +69°40'47".20
Located 104".7 west and 1".4 north of the center of M82 (Discovery page) (Matthieu Conjat image) (Matthieu Conjat image)
Mag 19.9:3/16, Type unknown

AT2020emi (= PNV J00424612+4111362) TNS discovered 2020/03/15.767 by Flavio Castellani, Raffaele Belligoli (ISSP); Kamil Hornoch and Hana Kucakova
Found in M31 at R.A. = 00h42m52s.180, Decl. = +41°13'37".00
Located 88".4 east and 151".3 south of the center of M31 (Discovery image)
Mag 17.4:3/15, Type unknown (References: ATEL 13561)

AT2020ely (= XMr9ZX), TNS discovered 2020/03/14.607 by Xingming Observatory Sky Survey (XOSS); K. Hornoch et al.
Found in M81 at R.A. = 09h55m54s.810, Decl. = +69°03'10".20
Located 116".0 east and 44".9 south of the center of M81 (Discovery image) (Marc Serrau image) (Marc Serrau image) (Marc Serrau image) (Marc Serrau image) (Marc Serrau image)
Mag 19.9:3/20 (17.6:3/18), Type unknown (References: ATEL 13556)

AT2020elx (= GSNST-20am), TNS discovered 2020/03/14.886 by GSNST
Found in LMC at R.A. = 05h27m10s.860, Decl. = -69°24'32".82
Located 0".0 east and 0".0 north of the center of LMC (Malhar R. Kendurkar image)
Mag 16.1:3/15 (15.9:3/14), Type Mira (zhost=0.000875)

AT2020efn (= XM27MZ) (= PNV J00424612+4111362), TNS; discovered 2020/03/08.585 by Koichi Itagaki Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m46s.140, Decl. = +41°11'35".80
Located 20".5 east and 272".7 north of the center of M31
Mag 16.6:3/8, Type unknown (References: CBAT TOCP)

AT2020dzr (= PNV J00420856+4126008), TNS discovered 2020/03/04.759 by Flavio Castellani, Raffaele Belligoli and Claudio Marangoni (ISSP)
Found in M31 at R.A. = 00h42m08s.560, Decl. = +41°26'00".80
Located 403".0 west and 591".0 north of the center of M31 (Discovery image) (Roberto De Lorenzo image)
Mag 18.0:3/4, Type unknown (References: CBAT TOCP

AT2020dih (= ZTF20aaqhsil) (= ATLAS20hfc), TNS discovered 2020/02/22.429 by Zwicky Transient Facility (ZTF)
Found in M94 at R.A. = 12h50m35s.091, Decl. = +40°58'39".13
Located 203".3 west and 514".5 south of the center of M94
Mag 19.7:2/29, Type Nova (References: ATEL 13546, AstroNote 2020-60, AstroNote 2020-55, ZTF observations)

AT2020cqi (= XM26MZ) (= PNV J00424882+4118430), TNS discovered 2020/02/15.548 by Xingming Observatory Sky Survey (XOSS)
Found in M31 at R.A. = 00h42m48s.820, Decl. = +41°18'43".00
Located 50".7 east and 154".5 north of the center of M31 (Discovery image)
Mag 19.2:2/15, Type unknown (References: CBAT TOCP)

AT2020cnn (= ZTF20aangkoo) (= TCP J12355218+2755559), TNS discovered 2020/02/12.176 by Zwicky Transient Facility (ZTF)
Found in M82 at R.A. = 09h56m16s.826, Decl. = +69°41'41".94
Located 0".0 east and 0".0 north of the center of M82
Mag 20.3:2/12, Type Nova (z=0.0008) (References: ATEL 13497, ZTF observations)

AT2020bmf (= XM25MZ) (= PNV J09554842+6907325), TNS discovered 2020/01/31.049 by Xingming Observatory Sky Survey (XOSS); Kamil Hornoch et al
Found in M81 at R.A. = 09h55m48s.420, Decl. = +69°07'32".50
Located 81".8 east and 217".4 north of the center of M81 (Discovery page) (Discovery image) (K. Hornoch image)
Mag 19.8:1/31, Type unknown (References: ATEL 13440, CBAT TOCP)

AT2020ber (= XM24MZ) (= PNV J00425232+4116128), TNS discovered 2020/01/28.544 by Xingming Observatory Sky Survey (XOSS); Hana Kucakova and Kamil Hornoch
Found in M31 at R.A. = 00h42m52s.320, Decl. = +41°16'12".80
Located 90".6 east and 4".5 north of the center of M31 (XOSS disocvery image) (Hornoch discovery image)
Mag 17.0:1/28, Type EGN (References: ATEL 13430, ATEL 13425, CBAT TOCP)

AT2020bcg (= XM23MZ), TNS discovered 2020/01/26.565 by Xingming Observatory Sky Survey (XOSS)
Found in M33 at R.A. = 01h34m01s.200, Decl. = +30°28'37".20
Located 132".9 east and 659".8 south of the center of M33 (Discovery image)
Mag 19.3:1/26, Type unknown

AT2019zhd (= PNV J00403785+4034529), (= ZTF19adakuot), TNS discovered 2019/12/14.097 by Zwicky Transient Facility (ZTF)
Found in M31 at R.A. = 00h40m37s.905, Decl. = +40°34'52".85
Located 1441".0 west and 2476".0 south of the center of M31 (Katsumi Yoshimoto image) (T. Noguchi image) (K. Itagaki image)
Mag 17.8:2/26 (14.9:2/13), Type LBV? (References: ATEL 13484, ZTF observations, CBAT TOCP, AAVSO page)

archive.gif For Novae which have faded below 18th magnitude, you will have to look in the archives
Current supernovae
Other Supernovae from 2020 Other Extragalactic Novae from 2020 Unconfirmed objects from 2020
Other Supernovae from 2019 Other Extragalactic Novae from 2019 Unconfirmed objects from 2019
Supernovae from 2018 Extragalactic Novae from 2018 Unconfirmed objects from 2018

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