Comet Encke (official designation: 2P/Encke) was discovered by Pierre Méchain on January 17, 1786http://en.wikipedia.org/wiki/Comet_Encke#DiscoveryComet 46P/Wirtanen was discovered photographically on January 17, 1948http://astronomy.activeboard.com/t15244141/46pwirtanen/Delta-Cancrid meteor showerhttp://astronomy.activeboard.com/t5463247/delta-cancrid-meteors/Sierra Nevada fireball, 17 January 2013http://astronomy.activeboard.com/t52310706/bay-area-meteor/
Lolland Island meteorite, January 17th 2009http://astronomy.activeboard.com/t24146846/trolig-meteor/
MeteoritesThe Tomakovka (LL6) meteorite fell in Dnepropetrovsk, Ukraine, on the 17th January, 1905.http://astronomy.activeboard.com/t47332372/tomakovka-meteorite/The Haripura (CM2) meteorite fell in Rajasthan, India, on the 17th January, 1921.http://astronomy.activeboard.com/t47332374/haripura-meteorite/The Chisenga (Iron) meteorite fell in Northern, Malawi, on the 17th January, 1988.http://astronomy.activeboard.com/t47332368/chisenga-meteorite/The Maribo (carbonaceous chondrite) meteorite fall occurred on 17 January 2009 over the island of Lollandhttp://astronomy.activeboard.com/t24146846/trolig-meteor/