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M82 X-1

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Suspected black hole

M82 X-1
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Ursa Major
Right ascension	09^h 55^m 50.01^s
Declination	69° 40′ 46.0″
Database references
SIMBAD	data

M82 X-1 is anultra-luminous X-ray source located in the galaxyM82. It is a candidateintermediate-mass black hole, with the exact mass estimate varying from around 100 to 1000 solar masses.^[1]^[2]^[3] One of the most luminous ULXs ever known, its luminosity exceeds theEddington limit for a stellar mass object.

^Fiorito, Ralph; Titarchuk, Lev (2004). "Is M82 X-1 Really an Intermediate-Mass Black Hole? X-Ray Spectral and Timing Evidence".The Astrophysical Journal.614 (2):L113–L116.arXiv:astro-ph/0409416.Bibcode:2004ApJ...614L.113F.doi:10.1086/425736.S2CID 10183683.
^Brightman, Murray; Harrison, Fiona A.; Barret, Didier; Davis, Shane W.; Fürst, Felix; Madsen, Kristin K.; Middleton, Matthew; Miller, Jon M.; Stern, Daniel; Tao, Lian; Walton, Dominic J. (2016)."A Broadband X-Ray Spectral Study of the Intermediate-mass Black Hole Candidate M82 X-1 with NuSTAR, Chandra, and Swift".The Astrophysical Journal.829 (1): 28.arXiv:1607.03903.Bibcode:2016ApJ...829...28B.doi:10.3847/0004-637X/829/1/28.S2CID 19765183.
^"Strange case of M82 X-1: A rare midsize black hole | EarthSky.org".earthsky.org. 19 August 2014. Retrieved2019-03-03.

Bayer	α (Dubhe) β (Merak) γ (Phecda) δ (Megrez) ε (Alioth) ζ (Mizar) η (Alkaid) θ ι (Talitha) κ (Alkaphrah) λ (Tania Borealis) μ (Tania Australis) ν (Alula Borealis) ξ (Alula Australis) ο (Muscida) π¹ π² ρ σ¹ σ² τ υ φ χ (Taiyangshou) ψ ω c
Flamsteed	2 (A) 5 (b) 6 15 (f) 17 18 (e) 20 21 22 23 (h) 24 (d) 26 27 28 31 32 35 36 37 38 39 40 41 42 43 44 46 47 (Chalawan) 49 51 55 56 57 58 59 60 61 62 65 66 67 68 70 71 72 73 74 75 76 78 80 (Alcor) 81 82 83 84 86 55 Cam 56 Cam 57 Cam 1 CVn 14 LMi 15 LMi 25 LMi 47 LMi 37 Lyn 39 Lyn 41 Lyn (Intercrus)
Variable	R T U W Z RV ST SU SW SX TU TX TY UX UY VV VX VY XY ZZ AA AB AE AN AR AW BC BE BM BZ CG CH CO CQ CY DH DI DM DV DW EE EG EI EK EN EP ER ET EU EV EZ IY KS V441 V442
HR	3922 4067 4098 4132 4867 5148 5256
HD	68988 (Násti) 74389 80606 80607 84406 98618 99706 116798 (Sidus Ludovicianum) 118203 (Liesma) 233731
Other	ADS 7251 CWISE J1055+5443 CWISEP J1047+5457 Feige 55 G 196-3 Gliese 412 Gliese 414 GJ 1151 GJ 3512 Groombridge 1618 Groombridge 1830 HAT-P-3 (Dombay) HAT-P-13 HAT-P-21 (Mazaalai) HIP 57050 HIP 57274 Holmberg IX V1 KELT-24 Lalande 21185 LAMOST J112456.61+453531.3 M82 X-1 M82 X-2 NGC 3000 Qatar-8 TOI-1260 US 708 Winnecke 4 WISE 1405+5534 WISEA 1101+5400 WISEPA J101905.63+652954.2 XTE J1118+480

Exoplanets	47 Ursae Majoris b (Taphao Thong) c (Taphao Kaew) d 41 Lyncis b (Arkas) Gliese 414 Ab c HAT-P-3b (Teberda) HAT-P-13b c HD 68988 b (Albmi) c HD 80606 b HD 89744 b HD 102956 b (Isagel) HD 118203 b (Staburags) HIP 57274 d KELT-18b

Star clusters	Palomar 4

Nebulae	NGC 5455 NGC 5461 NGC 5471 Owl Nebula

Messier	81 (Bode's Galaxy) 82 (Cigar Galaxy) 101 (Pinwheel Galaxy) 108 109
NGC	2603 2606 2681 2685 2688 2692 2768 2787 2800 2805 2814 2841 2857 2950 2959 2976 2985 2998 3005 3006 3008 3009 3073 3077 3079 3182 3184 3191 3198 3206 3259 3266 3310 3319 3353 3359 3435 3445 3448 3516 3539 3545B 3550 3552 3553 3554 3558 3561 3583 3610 3613 3614 3619 3625 3631 3642 3656 3657 3665 3669 3675 3690 3718 3726 3729 3733 3738 3741 3756 3780 3786 3794 3811 3877 3891 3893 3898 3913 3916 3921 3928 3938 3941 3945 3949 3950 3953 3971 3972 3977 3978 3982 3985 3994 3995 3998 4013 4020 4026 4036 4041 4051 4062 4068 4088 4096 4100 4102 4141 4144 4157 4172 4194 4335 4500 4511 4605 4814 5001 5164 5201 5204 5256 5278 5279 5308 5322 5342 5376 5422 5443 5448 5473 5474 5475 5477 5480 5485 5486 5502 5585
Numbered	Ursa Major I Dwarf Ursa Major II Dwarf Ursa Major III
Other	1ES 1011+496 2MASX J10222849+5006200 3C 219 3C 244.1 3C 254 3C 263 3C 268.3 4C 49.22 4C 55.16 4C 58.17 4C 61.23 4C 71.07 Abell 1068 BCG Arp 104 Arp 299 B2 1144+35 GN-108036 GN-z11 GNz7q GOODS-N-774 Haro 2 Holmberg II Holmberg IX I Zwicky 18 IC 708 IC 711 IC 758 IC 923 IC 2574 IRAS F11119+3257 Kiso 5639 Markarian 177 Markarian 231 Markarian 273 Markarian 421 Mayall's Object Q0906+6930 QSO B1038+528A SBS 0953+549 SBS 1425+606 SDSS J1001+5027 SDSS J1011+5442 SDSS J1148+5251 Twin Quasar UGC 4879 UGC 5101 UGC 5460 UGC 5497 UGC 5692 UGC 6541 UGC 6945 UGC 7069 UGC 8335 UGC 8508 UGC 8837 Willman 1 z8_GND_5296

Galaxy clusters	Abell 665 Abell 1185 M101 Group M109 Group NGC 2841 group SDSS J1038+4849 SDSS J1152+3313 SpARCS1049+56 Ursa Major Cluster

Astronomical events	iPTF14hls M101 OT2015-1 SN 1993J SN 1998aq SN 1998S SN 1999by SN 2011by SN 2011fe SN 2014J SN 2023ixf SN H0pe