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GRO J0422+32 ❍｜Definition｜1st｜20260912203812-00-⌔
GRO J0422+32
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 1992.12 During outburst, it was observed to be stronger than the Crab Nebula gamma-ray source out to photon energies of about 500 keV.[
The mass of the black hole in GRO J0422+32 falls in the range 3.66 to 4.97 solar masses.3 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.4
It is also known to have a companion M-type main-sequence star, V518 Per,5 in the constellation Perseus. It has a magnitude of 13.5 in the B spectral band, and 13.2 in the visible band.
Printed 2026-09-12.
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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 ↩
GRO J0422+32 ❍｜SIMBAD｜1st｜20260912213603-00-●
GRO J0422+32 (Retrieved 2026-09-12.)
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