| 词条 | 57P/du Toit–Neujmin–Delporte |
| 释义 |
| name=57P/du Toit–Neujmin–Delporte | image= | discoverer=Daniel du Toit, Grigory N. Neujmin, Eugène Joseph Delporte | discovery_date=July 18, 1941 | designations=1983 IX; 1983g; 1989 XIV; 1989l; 57P/1941 OE; 1941 VII; 1941e; 57P/1941 O1; 1941 VII; 1941e; 57P/1970 N2; 1970 XIII; 1970i; 57P/1983 RD6; 1983 IX; 1983g | epoch=July 25, 2002 (JD 2452480.5) | semimajor= 3.452865 AU | perihelion= 1.729511 AU | aphelion= 5.176218 AU | eccentricity= 0.499108 | period=6.42 a | inclination= 2.8447° | last_p=May 22, 2015 | next_p=October 17, 2021[1][2][3] }}57P/du Toit–Neujmin–Delporte is the designation of a periodic comet. In 2002 it was discovered to have broken up into at least 19 fragments.[4] DiscoveryThe comet has many co-discoverers and a complicated discovery history due to unreliable communications during World War II. Daniel du Toit P/1941 O1discovered the comet on July 18, 1941, working at Boyden Station, South Africa. His cabled message about the comet did not reach his employer, Harvard College Observatory, until July 27. During a routine asteroid search, Grigory N. Neujmin (Simeis Observatory, Soviet Union) found the comet on a photographic plate exposed July 25. He confirmed his own observation on July 29, but the radiogram from Moscow took 20 days to reach Harvard. The official announcement of the new comet finally happened on August 20, 1941. A few days later, it became known that Eugène Joseph Delporte at the Royal Observatory, Belgium, also had found the comet on August 19, so he was added to the list of discoverers. A few weeks later, news from Paul Ahnert at Sonneberg, Thuringia, Germany, reached Harvard that he also observed the new comet on July 22, but it was too late to recognize his contribution. References1. ^{{cite web |date=2010-03-24 |title=57P/du Toit-Neujmin-Delporte |publisher=Seiichi Yoshida's Comet Catalog |author=Seiichi Yoshida |url=http://www.aerith.net/comet/catalog/0057P/index.html |accessdate=2012-02-18}} 2. ^{{cite web |date=2009-11-24 |title=Note number : 0040 P/Du Toit-Neujmin-Delporte : 57P |publisher=Institut de mécanique céleste et de calcul des éphémérides |author=Patrick Rocher |url=http://www.imcce.fr/en/ephemerides/donnees/comets/FICH/CIF0040.php |accessdate=2012-02-19}} 3. ^57P past, present and future orbital elements (Kazuo Kinoshita) 4. ^{{cite web |year=2002 |title=Spectacular Comet Breakup |publisher=Newsletter from the Institute for Astronomy, University of Hawaii (No.5 - Summer 2002) |url=http://ifa.hawaii.edu/newsletters/article.cfm?a=77&n=9 |accessdate=2011-08-29}} External links
3 : Periodic comets|Comets in 2015|Astronomical objects discovered in 1941 |
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