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GRO J0422+32 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.
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. 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.
It is also known to have a companion M-type main-sequence star, V518 Per, in the constellation Perseus. It has a magnitude of 13.5 in the B spectral band, and 13.2 in the visible band.
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.
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