Historical Supernova Boneyard

Welcome to the Boneyard.   On this page you will find entries for objects that have been confirmed as Cataclysmic variables, asteriods (otherwise known as Vermin of the sky), or some other non extragalactic event.   Why keep them around? Because you never know when something like this will come back to life... AA17666-11 sites several supernova mistakes from this period.

1998di (= KL Dra) (= PSN J19243815+5941471), IAUC 6982 discovered 1998/08/02 by Mike Schwartz
Found in MCG +10-27-12 NED01 at R.A. = 19h24m38s.19, Decl. = +59°41'46".7
Located 0".6 east and 3".8 north of the nucleus of MCG +10-27-12 NED01 (Discovery image (local mirror)) (VSnet 98di web page) (Confirmation image) (Rafael Benavides image) (Joseph Brimacombe image) (Xavier Bros image)
Mag 16.8:7/6/2013 (16.5:7/4/2013, Type CV NOTE: This has now been confirmed to be not a supernova, but a cataclysmic variable (dwarf nova) of the CR Boo class. This is a galactic object. (CfA Spectrum) (References: IAUC 6983, 7382, ATEL 5188)

1992X, IAUC 5517 discovered 1992/04/28.000 by Jean Mueller
Found in MCG +6-32-24 at R.A. = 14h24m15s.10, Decl. = +35°08'27".0
Located 2" west and 7" south of the center of MCG +6-32-24
Mag 18.0:4/28, Type *

1992W, IAUC 5517 discovered 1992/04/28.000 by Jean Mueller
Found in MCG +8-23-96 at R.A. = 12h50m23s.00, Decl. = +48°05'26".0
Located 24" west and 32" north of the center of MCG +8-23-96
Mag 18.0:4/28, Type *

1991ap, IAUC 5327 discovered 1991/08/16.100 by Christian Pollas
Found in an anonymous galaxy at R.A. = 00h18m23s.80, Decl. = +32°00'37".0
Located 0" east and 0" north of the center of the host galaxy
Mag 19.0:8/16, Type QSO

1990C, IAUC 4950 discovered 1990/01/20.970 by Christian Pollas
Found in an anonymous galaxy at R.A. = 08h04m23s.90, Decl. = +22°43'53".0
Located 0".2 west and 1".9 north of the center of the host galaxy
Mag 19.5:1/20, Type HII

1989Z, IAUC 5162 discovered 1989/12/30.000 by Shaw
Found in NGC 4013 at R.A. = 11h58m32s.0, Decl. = +43°56'54".0
Located 10" east and 4" north of the center of NGC 4013
Mag 12.0:12/30, Type CV (References: IAUC 6911 IAUC 6920

1988X, IAUC 4378 discovered 1988/11/17.000 by M. Koishikawa
Found in an anonymous galaxy at R.A. = 09h23m29s.90, Decl. = -25°46'11".0
Located 0" east and 0" north of the center of the host galaxy
Mag 20.0:11/17, Type HII (References: IAUC 4379)

1987H, IAUC 4387 discovered 1987/04/29.600 by H. Kosai
Found in NGC 5363 at R.A. = 12h53m10s.00, Decl. = +05°29'00".0
Located 0" east and 0" north of the center of NGC 5363
Mag 12.1:4/29, Type * (References: IAUC 4379)

1987E, IAUC 4373 discovered 1987/04/24.183 by M. Rosa
Found in NGC 4725 at R.A. = 12h52m20s.70, Decl. = +25°18'22".0
Located 11" west and 96" north of the center of NGC 4725
Mag 15.7:4/24, Type * (high proper motion) (References: IAUC 4382)

1986H, IAUC 4213 discovered 1986/05/11.940 by Christian Pollas
Found in NGC 5645 at R.A. = 14h30m39s.10, Decl. = +07°16'32".0
Located 0" east and 0" north of the center of NGC 5645
Mag 17.0:5/11, Type HII? (References: IAUC 4219)

1986F, IAUC 4206 discovered 1986/04/24.500 by Robert Evans
Found in NGC 5253 at R.A. = 13h39m55s.90, Decl. = -31°38'25".0
Located 10" east and 20" north of the center of NGC 5253
Mag 13.0:4/24, Type HII (References: IAUC 4212)

1986D, IAUC 4197 discovered 1986/03/22.000 by M. J. Lebofsky, G. H. Rieke, and W. F. Kailey
Found in M82 at R.A. = 09h55m50s.80, Decl. = +69°40'45".0
Located 9" west and 2" south of the center of M82
Mag 10.0:3/22, Type HII (References: IAUC 4202)

1985J (= NSV18704), IAUC 4059 discovered 1985/05/10.000 by B. Szeidl
Found in UGC 6274 at R.A. = 11h14m55s.50, Decl. = +33°49'43".0
Located 9" east and 5" north of the center of UGC 6274
Mag 14.0:5/10, Type CV? (References: IAUC 4066, IAUC 4070; SN 2005R)

1983H, ATEL xxxx discovered 1983/05/11.020 by Carlton Pennypacker
Found in NGC 6217 at R.A. = 16h32m39s.200, Decl. = +78°11'53".00
Located 23".0 east and 53".0 south of the center of NGC 6217
Mag 15.1:5/11, Type unknown

1974L, PASP 87, 401 discovered 1974/11/18.000 by Charles Kowal
Found in an anonymous galaxy at R.A. = 11h06m06s.0, Decl. = +28°11'47".0
Located 0" west and 0" south of the center of the host galaxy
Mag 19.0:11/18, Type CV (NOTE: Data from original paper) (References: OSC, TNS)

1916A, CBAT SN discovered 1916/01/01.000 by Curtis
Found in NGC 251 at R.A. = 00h47m54s.0, Decl. = +19°35'49".0 (Exact coordinates not given)
Located 0" east and 0" north of the center of NGC 251
Mag 99.9:1/1, Type unconfirmed (References: OSC, TNS)

1967F Uncertain nature
1973G Foreground variable
1984Z Unconfirmed, listed only in the ASC


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