Principal objects in field: Christmas Tree cluster, Cone nebula, IC 2169, NGC 2239, NGC 2244, NGC 2252, NGC 2264, Part of the constellation Gemini (Gem), Rosette nebula, The star 13Mon, The star 15Mon, The star 17Mon, The star 18Mon, The star 26Gem, The star 30Gem, The star 38Gem, The star Alhena (γGem), The star εMon, The star ξGem