Daniel du Toit List of numbered comets Astronomical naming conventions 2019 C-League List of postage stamps of Guernsey C/2012 E2 (SWAN) 276P/Vorobjov Comet NEOWISE
Daniel du Toit List of numbered comets Astronomical naming conventions 2019 C-League List of postage stamps of Guernsey C/2012 E2 (SWAN) 276P/Vorobjov Comet NEOWISE