139P/Väisälä–Oterma

Periodic comet with 9 year orbit other comets also discovered by Yrjö Väisälä Comet Väisälä 139P/Väisälä–Oterma Yrjö VäisäläLiisi Oterma October 7, 1939 1939 TN; 1998 WG22 March 6, 2006 4.511 AU 3.402 AU 5.62 AU 0.2458 9.58 a 2.3296° 2.6 km miLamy_2004 510 70 kg/m3Paradowski_2022 December 10, 2017April 19, 2008 2027-Jul-23139p 139P/Väisälä–Oterma is a periodic comet in the Solar System. When it was discovered in 1939 it was not recognized as a comet and designated as asteroid 1939 TN. References P. L. Lamy I. Toth Y. R. Fernández H. A. Weaver Comets II The Sizes, Shapes, Albedos, and Colors of Cometary Nuclei https://physics.ucf.edu/~yfernandez/papers/comets2chapter/comets2reprint.pdf 2004 223–264 University of Arizona Press 10.2307/j.ctv1v7zdq5.22 2004come.book..223L j.ctv1v7zdq5.22 978-0-8165-2450-1 M. L. Paradowski A New Indirect Method of Determining Density of Cometary Nuclei https://acta.astrouw.edu.pl/Vol72/n2/pdf/pap_72_2_4.pdf Acta Astronomica 2022 72 2 141–159 2022AcA....72..141P 0001-5237 10.32023/0001-5237/72.2.4 free External links 1000238 139P 139P/Väisälä–Oterma at the Minor Planet Center database 139P/Väisälä–Oterma at Seiichi Yoshida's website 139P/Väisälä–Oterma at Gary W. Kronk's Cometography 138P/Shoemaker–Levy 140P/Bowell–Skiff Category:Periodic comets 0139 Category:Discoveries by Liisi Oterma + 139P * *