NGC 7492 Photek Ltd IC 2574 PGC 2456 NGC 40 NGC 7793 List of least massive black holes Indian Institute of Astrophysics Wolf–Lundmark–Melotte AstroSat NGC 2336 NGC 1851 SN 2018cow Tolman–Oppenheimer–Volkoff limit Cippi of Melqart List of astronomy acronyms Canadian Space Agency