57P/du Toit–Neujmin–Delporte Daniel du Toit 815 Coppelia Astronomical naming conventions 55 Pandora Eugène Joseph Delporte List of numbered comets 154 Bertha 1470 Carla 78 Diana 724 Hapag Jean-Louis Steinberg 880 Herba 177 Irma 200 Dynamene 65 Cybele Gravitational collapse Comet West 58P/Jackson–Neujmin V4381 Sagittarii 276P/Vorobjov Tides in marginal seas Event horizon Russian names in space Timeline of gravitational physics and relativity Black hole Roger Penrose Comet NEOWISE General relativity Jack Parsons 56P/Slaughter–Burnham C/2012 E2 (SWAN)