GRO J0422+32

Star in the constellation Perseus

GRO J0422+32
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Perseus
Right ascension	04^h 21^m 42.77^s^[1]
Declination	+32° 54′ 26.7″^[1]
Apparent magnitude (V)	13.2
Distance	7,800^[2] ly (2,400 pc)
Spectral type	M4.5V^[1] + Black hole
Other designations
V518 Per, GRO J0422+33, RLC2006 XB2, Granat 0417+335, Nova Persei 1992, Nova Persei 1993, ZGH2005 OS00676-097731 GRO J0422+32, ZGH2005 XS00676B3-003
Database references
SIMBAD	data

A visual band light curve for GRO J0422+32, adapted from Chevalier and Ilovaiski (1995)^[3]

GRO J0422+32^[1] is an X-ray nova and black hole candidate that was discovered by the BATSE instrument on the Compton Gamma Ray Observatory satellite on 5 August 1992.^[4]^[5] During outburst, it was observed to be stronger than the Crab Nebula gamma-ray source out to photon energies of about 500 keV.^[2]

The mass of the black hole in GRO J0422+32 falls in the range 3.66 to 4.97 solar masses.^[6] This is the smallest yet found for any stellar black hole, and near the theoretical upper mass limit (~2.7 M_☉) for a neutron star. Further analysis in 2012 calculated a mass of 2.1 M_☉, which raises questions as to what the object actually is.^[7]

It is also known to have a companion M-type main-sequence star, V518 Per,^[8] in the constellation Perseus. It has a magnitude of 13.5 in the B spectral band, and 13.2 in the visible band.

References

^ ^a ^b ^c ^d "GRO J0422+32". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 December 2016.
^ ^a ^b Ling, J. C.; Wm; Wheaton, A. (2003). "BATSE Soft γ-Ray Observations of GROJ0422+32". Astrophys. J. 584 (1): 399–413. arXiv:astro-ph/0210673. Bibcode:2003ApJ...584..399L. doi:10.1086/345602. S2CID 118954541.
^ Chevalier, C.; Ilovaisky, S. A. (May 1995). "CCD photometry of GRO J0422+32 during activity and quiescence". Astronomy and Astrophysics. 297: 103–114. Bibcode:1995A&A...297..103C.
^ Harmon, B. A.; Fishman, G. J.; Paciesas, W. S.; Briggs, M. S. (1993). "Gro J0422+32". International Astronomical Union Circular (5781): 2. Bibcode:1993IAUC.5781....2H.
^ McCrosky, R. E.; Mueller, J.; Schmeer, P. (1992). "Gro J0422+32 = GRS 0417+335". International Astronomical Union Circular (5597): 3. Bibcode:1992IAUC.5597....3M.
^ Gelino, Dawn M.; Harrison, Thomas E. (2003). "GRO J0422+32: The Lowest Mass Black Hole?". The Astrophysical Journal. 599 (2): 1254–1259. arXiv:astro-ph/0308490. Bibcode:2003ApJ...599.1254G. doi:10.1086/379311. S2CID 17785067.
^ Kreidberg, Laura; Bailyn, Charles D.; Farr, Will M.; Kalogera, Vicky (2012). "Mass Measurements of Black Holes in X-ray Transients: is There a Mass Gap?". The Astrophysical Journal. 757 (36): 17pp. arXiv:1205.1805. Bibcode:2012ApJ...757...36K. doi:10.1088/0004-637x/757/1/36. S2CID 118452794.
^ General Catalogue of Variable Stars, 3rd ed. (1971) Moscow^{[page needed]}

Constellation of Perseus

Stars

Bayer	α (Mirfak) β (Algol) γ δ ε ζ η (Miram) θ ι κ (Misam) λ μ ν ξ (Menkib) ο (Atik) π ρ σ τ φ ψ ω b
Flamsteed	1 2 3 4 (g) 5 7 8 9 (i) 10 11 12 14 16 17 20 21 24 29 30 31 32 (l) 34 36 40 (o) 42 (n) 43 (A) 48 (c) 49 50 52 (f) 53 (d) 54 55 56 57 (m) 58 (e) 59 1 Aur
Variable	S T U V X Z RS RT RV RW RY ST SU SV TZ UV UX UY VX XX XY XZ YZ AB AG AR AS AW AX BM DM DY FO GK IK IP IQ IU IW IX IZ KP KS KT KW LX V351 V356 V357 V361 V376 V380 V386 V392 V396 V400 V423 V432 V440 V459 V461 V471 V472 V473 V480 V490 V492 V505 V509 V518 V520 (61 And) V521 V545 V551 V572 V573 V575 V576 V621 V718 V1024
HR	470 526 529 538 540 621 641 787 792 810 820 831 842 846 849 864 865 876 885 886 890 894 918 (k) 920 923 930 949 950 956 964 966 969 973 975 979 986 991 1001 1019 1034 1037 1041 1047 1051 1056 1059 1074 1097 1113 1127 1130 1133 1141 1160 1164 1176 1191 1197 1198 1207 1215 1226 1234 1286 1301 1330 1333 1337 1344 1371 1390 1419 1424 1482 1489 1493 1500 1514
HD	13519 14433 14434 16691 16760 17092 17245 17605 21684 22781 23301 23596 25329 26702 29587
Other	BD+31 643 BD+48 740 G 38-29 G 95-57 GD 61 HAT-P-15 (Berehynia) HAT-P-29 (Muspelheim) IRAS 04296+3429 L1448-IRS2E LkHα 101 LRLL 54361 NGC 1333 13 NGC 1333 IRAS 2A NGC 1333 IRAS 4A NGC 1333 IRAS 4B NGC 1624-2 PSR B0355+54 PSR J0357+3205 WR 4

Exoplanets	WASP-11b/HAT-P-10b

Star
clusters

NGC	869 (h) 884 (χ) 957 1039 1220 1285 1342 1444 1513 1528 1545 1624
Other	Alpha Persei Cluster IC 348 Trumpler 2

Nebulae

NGC	650 (Little Dumbbell Nebula) 1333 1491 1499 (California Nebula) 1579
Other	Barnard 203 Wreath Nebula

Galaxies

NGC	1003 1023 1058 1077 1160 1161 1167 1169 1250 1259 1260 1264 1265 1267 1268 1270 1271 1272 1273 1274 1275 1277 1278 1279 1281 1282 1283 1293 1294 1334
Other	IC 310 UGC 2885 (Godzilla galaxy) 4C +37.11