5145 Pholus


5145 Pholus

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=5145 Pholus
discoverer=Spacewatch
(David L. Rabinowitz)
discovered=January 9, 1992
alt_names=1992 AD
mp_category=Centaur, Asteroid
orbit_ref =
epoch=November 30, 2008 (JD 2454800.5)
semimajor=3045.2 Gm
(20.356 AU)
perihelion=1305.9 Gm
(8.730 AU)
aphelion=4784.1 Gm
(31.98 AU)
eccentricity=0.5711
period=33547.41 d
(91.85 yr)
inclination=24.65°
asc_node=119.44°
arg_peri=354.92°
mean_anomaly=67.49°
avg_speed=6.01 km/s
dimensions=185±16 km [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1996ciss.conf...97D&db_key=AST&high=3d6ea7529520743]
mass=~6.6e|18 kg
density=2.0? g/cm³ (assumed)
surface_grav=~0.052 m/s²
escape_velocity=~0.098 km/s
rotation=9.98 hourscite web
date=2008-05-27 last obs
title=JPL Small-Body Database Browser: 5145 Pholus (1992 AD)
url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Pholus
accessdate=2008-09-01
]
spectral_type= (red) B-V=1.19; V-R=0.78 [cite web|url=http://www.physics.nau.edu/~tegler/research/survey.htm |title=Kuiper Belt Object Magnitudes and Surface Colors |accessdate=2006-11-05 |last=Tegler |first=Stephen C. |coauthors= |date=2006-01-26]
abs_magnitude=7.0
albedo=0.046±0.02
single_temperature=~62 K

5145 Pholus (pronEng|ˈfoʊləs "foe'-ləs," from _gr. "Φόλος") is a centaur in an eccentric orbit, with a perihelion less than Saturn's and aphelion greater than Neptune's. Close approches are rare: It has not come within one astronomical unit of a planet since 764 BC, and will not again until 5290. It is believed to have originated as a Kuiper belt object.

It was discovered by David L. Rabinowitz, then of the University of Arizona's Spacewatch Project, and named after Pholus, the brother of the mythological Chiron, after which 2060 Chiron was named in order to follow the tradition of naming this class of outer planet crossing objects after Centaurs.

Pholus was the second centaur type asteroid to be discovered and was quickly found to be quite red in color, for which it has been occasionally nicknamed "Big Red". The color has been speculated to be due to organic compounds on its surface (Wilson, "et al.", 1994).

The surface composition of Pholus has been estimated from its reflectance spectrum using two spatially segregated components (Cruikshank, "et al.", 1998): dark amorphous carbon and an intimate mixture of water ice, methanol ice, olivine grains, and complex organic compounds (tholins). The carbon black component was used to match the low albedo of the object.

Unlike the first Centaur, 2060 Chiron, Pholus has shown no signs of cometary activity.

The diameter of Pholus is estimated to be 185±16 km [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1996ciss.conf...97D&db_key=AST&high=3d6ea7529520743] .

References

* PMID 11539180

*

* [http://chemistry.unina.it/~alvitagl/solex/ SOLEX ]

External links

* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Pholus;orb=1;view=Far Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Pholus Ephemeris]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • (5145) pholus — Pour les articles homonymes, voir Pholus. 5145 Pholus pas de photo Caractéristiques orbitales Époque 14 juillet 2004 ( …   Wikipédia en Français

  • 5145 Pholus — (5145) Pholus Pour les articles homonymes, voir Pholus. 5145 Pholus pas de photo Caractéristiques orbitales Époque 14 juillet 2004 ( …   Wikipédia en Français

  • (5145) Pholus — Pour les articles homonymes, voir Pholus. (5145) Pholus Caractéristiques orbitales Époque 14 juillet 2004 (JJ 2453200,5) Demi grand axe 3 055,227×106 km (20,423 ua …   Wikipédia en Français

  • (5145) Pholus — Asteroid (5145) Pholus Eigenschaften des Orbits (Animation) Orbittyp Zentaur Große Halbachse 20,423 AE …   Deutsch Wikipedia

  • (5145) Фол — 5145 Фол Открытие Первооткрыватель Дэвид Рабинович Дата обнаружения 9 января 1992 Альтернативные обозначения 1992 AD Категория Кентавры Орбитальные характеристики …   Википедия

  • Pholus — commonly refers to: * Pholus (astronomy), a Centaur (planetoid), 5145 Pholus, discovered in 1992 by David L. Rabinowitz * Pholus (mythology), a wise Centaur killed indirectly through the actions of Herakles * Pholus (astrology), hidden potential… …   Wikipedia

  • Pholus — ist in der Mythologie ein Zentaur, siehe Pholos ein Asteroid, siehe (5145) Pholus Diese Seite ist eine Begriffsklärung zur Unterscheidung mehrerer mit demselben Wort bezeichneter Begriffe …   Deutsch Wikipedia

  • Pholus (Asteroid) — Asteroid (5145) Pholus Eigenschaften des Orbits (Simulation) Orbittyp Zentaur Große Halbachse …   Deutsch Wikipedia

  • Pholus — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Dans la mythologie grecque, Pholus ou Pholos est un centaure. En astronomie, (5145) Pholus est un planétoïde, nommé d après le précédent. Catégorie :… …   Wikipédia en Français

  • Centaur (minor planet) — The centaurs are an unstable orbital class of minor planets named after the mythological race of centaurs. The name was chosen because they behave as half asteroid and half comet. Centaurs have transient orbits that cross or have crossed those of …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.