50P/Arend
{{Short description|Periodic comet with 8 year orbit}}
{{For|other comets discovered by Sylvain Arend|49P/Arend–Rigaux|C/1956 R1 (Arend–Roland)}}
{{Infobox comet
| name=50P/Arend
| image= Comet Arend 1951j.jpg
| caption= Comet 50P on 4 November 1951
| discoverer=Sylvian Arend
| discovery_date=October 4, 1951
| designations=1951 Q4, 1959 O4
| epoch=2009-Mar-01
| aphelion= 6.2531 AU
| perihelion= 1.9237 AU{{cite web
|type=2009-03-19 last obs
|title=JPL Small-Body Database Browser: 50P/Arend
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=50P
|publisher=Jet Propulsion Laboratory
|access-date=2012-02-18}}
| semimajor= 4.0884 AU
| eccentricity=0.52947
| period=8.27 a
| inclination=19.158°
| last_p=2016-Feb-08
November 1, 2007
| next_p=2024-May-12{{mpc|50p}}
}}
Comet Arend or 50P/Arend is a periodic comet in the Solar System which was discovered on October 4, 1951. It was discovered by astronomer Sylvain Julien Victor Arend{{cite web|title= 50P/Arend| url= http://cometography.com/pcomets/050p.html| work= Gary W. Kronk's Cometography| access-date=2010-03-02}} at the Royal Observatory of Belgium located in the municipality of Uccle. The comet was illustrated at approximately a magnitude of 14 and also exhibited a nucleus within a coma 14 arc seconds across. From its discovery, the comet has had 7 perihelions with its last return of Earth recorded on November 1, 2007.{{cite web|title=50P/Arend|url=http://www.aerith.net/comet/catalog/0050P/index.html|work= Aerith|access-date=2010-03-02}}{{cite web|title= 50P/Arend (2007)|url= http://www.aerith.net/comet/catalog/0050P/2007.html|work=Aerith|access-date=2010-03-02}}{{cite web|title=Periodic Comet 50P/Arend |url=http://www.observatorij.org/images/50p.html|work=H. Mikuz, Crni Vrh Observatory, Slovenia|access-date=2010-03-02}}{{cite web|title=Catalog of Hubble Space Telescope Comet Observations|url=http://pdssbn.astro.umd.edu/sbnhtml/comets/HST/hst_list_a.html|work=The Planetary Data System (PDS) Small Bodies Node (SBN)|access-date=2010-03-02|archive-url=https://web.archive.org/web/20100601161548/http://pdssbn.astro.umd.edu/sbnhtml/comets/HST/hst_list_a.html|archive-date=2010-06-01|url-status=dead}}{{cite web|title=COMETA 50P (Arend)|url=http://comete.uai.it/50p/index.htm|work=U.A.I. SEZIONE COMETE|access-date=2010-03-02|archive-url=https://web.archive.org/web/20110722055925/http://comete.uai.it/50p/index.htm|archive-date=2011-07-22|url-status=dead}} The comet's next perihelion will be in the year 2024.{{cite web | title=Numbered periodic comets index in perihelion year | url=http://jcometobs.web.fc2.com/pnum.htm | work=JComet Observations | access-date=2010-03-08}}{{cite web | title=Cometas Periódicos (Periodic Comets) | url=http://www.cometografia.com/cometas_periodicos.htm | work= Cometografia | access-date=2010-03-08}}
Observations
50P/Arend was observed at its brightest at a maximum magnitude of 14 when it was discovered in 1951. At the comet's next apparition on September 1, 1959, did not exceed 17 if it had not been for an outburst in November which affected its brightness to magnitude 15.5. The observed orbital period was 7.8 years at the time of its discovery however at each succeeding perihelion has led to less favorable observations due to its 0.64 astronomical units (AU) as it approached Jupiter in 1969, even if its maximum magnitude was 15. This approach also led to the comet's orbital period to increase to 8.0 years.
Long-term motion studies conducted by Brian G. Marsden on the comet 50P/Arend renders the comet's orbital eccentricity at 0.5 which makes it relatively undisturbed by Jupiter over the last 200-year cycles despite as passage of only 0.49 AU.{{cite journal|title=Resonance Hopping in Comets|bibcode=1997AJ....113.1433B|journal=Astronomical Journal|volume=113|page=1433|date=1997|author=Belbruno, E.|author2=Marsden, B. G.|name-list-style=amp|doi = 10.1086/118359 }}{{cite web|title=The Minor Planet Electronic Circulars contain information on unusual minor planets and routine data on comets|url= http://www.cfa.harvard.edu/mpec/K09/K09L24.html|work= Brian G. Marsden MPC|access-date=2010-03-02| archive-url= https://web.archive.org/web/20100411054130/http://www.cfa.harvard.edu/mpec/K09/K09L24.html| archive-date= 11 April 2010 | url-status= live}}{{cite journal|title=The colors of cometary nuclei—Comparison with other primitive bodies of the Solar System and implications for their origin|first2=Paul R|doi=10.1016/S0019-1035(03)00129-5|date=2003|last2=Weissman|last1=Lowry|first1=S|journal=Icarus|volume=164|issue=2|pages=492|bibcode=2003Icar..164..492L}} The study was conducted inside the interval where libration happens. Several comets, namely 50P/Arend, 4P/Faye, 6P/d'Arrest, 22P/Kopff, 36P/Whipple, 78P/Gehrels, 92P/Sanguin, 4015 Wilson-Harrington, and 128P/Shoemaker-Holt, were observed at the Palomar Observatory. Visible coma activity was only observed from 4P/Faye and 50P/Arend out of the 9 other comets from data obtained in May 2000 and March 2001.{{Cite journal|title=CCD observations of distant comets from Palomar and Steward Observatories |journal=Icarus |volume=164 |issue=2 |pages=492–503 |doi=10.1016/S0019-1035(03)00129-5|bibcode = 2003Icar..164..492L |year=2003 |last1=Lowry |first1=Stephen C. |last2=Weissman |first2=Paul R. }} There have been 1069 observations from October 8, 1951, to February 19, 2008, also where its mean residual is at 0".60.{{cite web|title= 50P/Arend|url= http://jcometobs.web.fc2.com/pcmtn/0050p.htm|work= Comet Orbit|access-date=2010-03-02}}
The nucleus of the comet has a radius of 0.95 ± 0.03 kilometers, assuming a geometric albedo of 0.04.{{cite journal |last1=Lamy |first1=P. L. |last2=Toth |first2=I. |last3=Weaver |first3=H. A. |last4=A'Hearn |first4=M. F. |last5=Jorda |first5=L. |title=Properties of the nuclei and comae of 13 ecliptic comets from Hubble Space Telescope snapshot observations |journal=Astronomy & Astrophysics |date=December 2009 |volume=508 |issue=2 |pages=1045–1056 |doi=10.1051/0004-6361/200811462|s2cid=125249770 |doi-access=free |bibcode=2009A&A...508.1045L }}
References
{{Reflist|30em}}
External links
- [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=50P;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=50P Horizons Ephemeris]
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