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5145 Pholus
Discovery
Discovered by Spacewatch
(David L. Rabinowitz)
Discovery date January 9, 1992
Designations
Alternative names 1992 AD
Minor planet
category		 Centaur, Asteroid
Epoch November 26, 2005 (JD 2453700. Spacewatch is a project at the University of Arizona that specializes in the study of Minor planets including various types of Asteroids and Comets David Lincoln Rabinowitz (born 1960) is a researcher at Yale University. Events 475 - Byzantine Emperor Zeno is forced to flee his capital at Constantinople. Year 1992 ( MCMXCII) was a Leap year starting on Wednesday (link will display full 1992 Gregorian calendar) A provisional designation in astronomy is the naming convention applied to Astronomical objects immediately following their discovery Asteroids, sometimes called Minor planets or planetoids', are bodies—primarily of the inner Solar System —that are smaller than planets but In Physics, an orbit is the gravitationally curved path of one object around a point or another body for example the gravitational orbit of a planet around a star In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. Events 43 BC - The Second Triumvirate alliance of Gaius Julius Caesar Octavianus ("Octavian" later "Caesar Augustus" Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. The Julian date (JD is the interval of time in days and fractions of a day since 4713 B 5)
Aphelion 4806. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 533 Gm (32. 130 AU)
Perihelion 1306. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 224 Gm (8. 732 AU)
Semi-major axis 3056. In Geometry, the semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae 379 Gm (20. For other meanings see Giga (disambiguation Giga- (symbol G is a prefix in the SI system of units denoting 109 The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International 431 AU)
Eccentricity 0. The astronomical unit ( AU or au or au or sometimes ua) is a unit of Length based on the distance from the Earth to the In Astrodynamics, under standard assumptions, any Orbit must be of Conic section shape 573
Orbital period 33730. The orbital period is the time taken for a given object to make one complete Orbit about another object 363 d (92. A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the 35 a)
Average orbital speed 6. In Astronomy, a Julian year (symbol a) is a unit of measurement of Time defined The orbital speed of a body generally a Planet, a Natural satellite, an artificial satellite, or a Multiple star, is the speed at which it 01 km/s
Mean anomaly 55. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units In the study of orbital dynamics the mean anomaly of an orbiting body is the Angle the body would have traveled about the center of the orbit's Auxiliary circle 230°
Inclination 24. Inclination in general is the Angle between a Reference plane and another plane or axis of direction 685°
Longitude of ascending node 119. This article describes the unit of angle For other meanings see Degree. The longitude of the ascending node (☊ or Ω is one of the Orbital elements used to specify the Orbit of an object in space 332°
Argument of perihelion 355. The argument of periapsis (or argument of perifocus) ( ω) is the Orbital element describing the Angle of an Orbiting body's periapsis 225°
Physical characteristics
Dimensions 185±16 km [1]
Mass ~6. Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object 6×1018 kg
Mean density 2. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 0? g/cm³
Equatorial surface gravity ~0. A cubic centimetre or cubic centimeter (symbol cm3 —the abbreviation cc, though widely used is deprecated is a commonly used unit of Volume The surface gravity, g, of an astronomical or other object is the Gravitational acceleration experienced at its surface 052 m/s²
Escape velocity ~0. In Physics, escape velocity is the speed where the Kinetic energy of an object is equal to the magnitude of its Gravitational potential energy 098 km/s
Rotation period 9. The rotation period of an astronomical object is the time it takes to complete one revolution around its Axis of rotation relative to the background stars 983 hours
Albedo 0. The albedo of an object is the extent to which it diffusely reflects light from the sun 046±0. 02
Temperature ~62 K
Spectral type (red) B-V=1. Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic 19; V-R=0. 78 [1]
Absolute magnitude 7. In Astronomy, absolute magnitude (also known as absolute visual magnitude) is the Apparent magnitude an object would have if it were at a standard 64

5145 Pholus (pronounced /ˈfoʊləs/ foe'-ləs, from Greek: Φόλος) is a centaur in an eccentric orbit, with a perihelion near the orbit of Saturn and aphelion near the orbit of Neptune. Greek (el ελληνική γλώσσα or simply el ελληνικά — "Hellenic" is an Indo-European language, spoken today by 15-22 million people mainly In Physics, an orbit is the gravitationally curved path of one object around a point or another body for example the gravitational orbit of a planet around a star In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from Neptune ( English|AmE] ] is the eighth and farthest Planet from the Sun in the Solar System. It is believed to have originated as a Kuiper belt object. The Kuiper belt (ˈkaɪpɚ to rhyme with "viper" sometimes called the Edgeworth-Kuiper belt, is a region of the Solar System beyond the planets extending

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. David Lincoln Rabinowitz (born 1960) is a researcher at Yale University. The University of Arizona (also referred to as UA, U of A, or Arizona) is a Land-grant and space-grant public institution Spacewatch is a project at the University of Arizona that specializes in the study of Minor planets including various types of Asteroids and Comets In Greek mythology, Chiron or Cheiron ("hand" was held as the superlative Centaur among his brethren TemplateInfobox Planet. --> 2060 Chiron (, or as in Χείρων) is a Planetoid in the

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). See also Activated carbon Amorphous carbon is an allotrope of carbon that does not have any Crystalline structure Water is a common Chemical substance that is essential for the survival of all known forms of Life. Methanol, also known as methyl alcohol, carbinol, wood alcohol, wood naphtha or wood spirits, is a Chemical compound The Mineral olivine (when gem-quality also called Peridot) is a Magnesium Iron silicate with the formula ( Mg Tholin (after the Greek word for muddy is a Heteropolymer formed by solar Ultraviolet irradiation of simple Organic compounds such as Methane The carbon black component was used to match the low albedo of the object. The albedo of an object is the extent to which it diffusely reflects light from the sun

Unlike the first Centaur, 2060 Chiron, Pholus has shown no signs of cometary activity. TemplateInfobox Planet. --> 2060 Chiron (, or as in Χείρων) is a Planetoid in the

The diameter of Pholus is estimated to be 185±16 km [2].

References

  1. ^ Tegler, Stephen C. (2006-01-26). Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1340 - King Edward III of England is declared King of France. Kuiper Belt Object Magnitudes and Surface Colors. Retrieved on 2006-11-05. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1499 - Publication of the Catholicon in Treguier ( Brittany)
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