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Encyclopedia > 24 Themis
24 Themis
Discovery A
Discoverer Annibale de Gasparis
Discovery date April 5, 1853
Alternate
designations B		 1947 BA; 1955 OH
Category Main belt (Themis)
Orbital elements C
Epoch August 18, 2005 (JD 2453600.5)
Eccentricity (e) 0.132
Semi-major axis (a) 468.226 Gm (3.130 AU)
Perihelion (q) 406.202 Gm (2.715 AU)
Aphelion (Q) 530.250 Gm (3.545 AU)
Orbital period (P) 2022.524 d (5.54 a)
Mean orbital speed 16.76 km/s
Inclination (i) 0.760°
Longitude of the
ascending node (Ω)		 35.992°
Argument of
perihelion (ω)		 107.989°
Mean anomaly (M) 185.968°
Physical characteristics D
Dimensions 198 km [1]
Mass 5.75±2.51×1019 kg [1]
Density 14±6 g/cm³ doubtful
Surface gravity 0.39±0.27 m/s²
Escape velocity 0.88±0.22 km/s
Rotation period 0.34892 d (8 h 23 min) [2] [3]
Spectral class C [4] (B-V=0.68)
Absolute magnitude 7.08
Albedo (geometric) 0.067 [5]
Mean surface
temperature		 ~159 K

24 Themis (thee'-məs, them'-əs (key)) is one of the largest Main belt asteroids. It is also the largest member of Themistian asteroid family. Annibale de Gasparis (April 9, 1819 – March 21, 1892) was an Italian astronomer. ... April 5 is the 95th day of the year in the Gregorian calendar (96th in leap years). ... 1853 was a common year starting on Saturday (see link for calendar). ... Provisional designation of in astronomy is the naming convention applied to astronomical objects immediately following their discovery. ... Minor planets, or planetoids are minor bodies of the Solar system orbiting the Sun (or of other planetary systems orbiting other stars) that are larger than meteoroids (the largest of which might be taken to be around 10 meters or so across) but smaller than major planets (Mercury having a... The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ... The Themis Asteroid Family The Themis Asteroid Family is a Hirayama family of asteroids found in the outer portion of the main asteroid belt, between the orbits of Mars and Jupiter. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... August 18 is the 230th day of the year (231st in leap years) in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... The Julian day or Julian day number (JDN) is the (integer) number of days that have elapsed since Monday, January 1, 4713 BC in the proleptic Julian calendar [1]. That day is counted as Julian day zero. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... giga- (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ... The metre, or meter (US), is a measure of length. ... The astronomical unit (AU or au or a. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Water, Rabbit, and Deer: three of the 20 day symbols in the Aztec calendar, from the Aztec Sun Stone. ... In astronomy, a Julian year is a unit of time defined as exactly 365. ... 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 orbits around the barycenter of a system, usually around a more massive body. ... Look up second in Wiktionary, the free dictionary. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1／360 of a full rotation. ... The Longitude of the ascending node () is one of the orbital elements used to specify the orbit of an object in space. ... The argument of the perihelion is one of the orbital elements describing the orbit of a planet. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2π radians at and only at periapsis. ... For the majority of numbered asteroids, almost nothing is known apart from a few physical parameters. ... Unsolved problems in physics: What causes anything to have mass? Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per volume. ... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... Gravity is a force of attraction that acts between bodies that have mass. ... Space Shuttle Atlantis launches on mission STS-71 In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... Asteroids are assigned a type based on spectral shape, color, and sometimes albedo. ... C-type asteroids are carbonaceous asteroids. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us (in the absence of interstellar extinction!). It allows the overall brightnesses of objects to be compared without regard to distance. ... Albedo is a ratio of scattered to incident electromagnetic radiation power. ... The geometric albedo of an astronomical body is the ratio of its total brightness at zero phase angle to that of an idealised fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section. ... Fig. ... The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero—the lowest possible temperature where nothing could be colder and no heat energy remains in a substance—is defined as zero kelvin (0 K). ... The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ... 253 Mathilde, a C-type asteroid. ... The Themis Asteroid Family The Themis Asteroid Family is a Hirayama family of asteroids found in the outer portion of the main asteroid belt, between the orbits of Mars and Jupiter. ...


It was discovered by Annibale de Gasparis on April 5, 1853. The mass and diameter appearing in the table are from separate sources, and combining them gives an unusually large density, which is most probably wrong. The mass has very likely been overestimated by a factor of at least five times. Annibale de Gasparis (April 9, 1819 – March 21, 1892) was an Italian astronomer. ... April 5 is the 95th day of the year in the Gregorian calendar (96th in leap years). ... 1853 was a common year starting on Saturday (see link for calendar). ...


It is named after Themis, the personification of divine order, law and custom in Greek mythology. In Greek mythology, Hesiod mentions Themis among the six sons and six daughters—of whom Cronos was one—of Gaia and Ouranos, that is, of Earth with Sky. ... The Oricoli bust of Zeus, King of the Gods, in the collection of the Vatican Museum. ...


Aspects

Stationary,
retrograde		 Opposition Distance to
Earth (AU)		 Maximum
brightness (mag)		 Stationary,
prograde		 Conjunction
to Sun
20 January 2005 27 June 2005 2.53419 11.9 22 August 2005 17 October 2005
19 March 2006 3 September 2006 2.23744 11.4 26 October 2006 18 December 2006
3 June 2007 9 December 2007 1.74455 10.6 24 January 2008 11 March 2008
23 September 2008 18 March 2009 2.00796 11.0 8 May 2009 27 June 2009
18 December 2009 26 May 2010 2.47353 11.8 21 July 2010 14 September 2010
16 February 2011 27 July 2011 2.45694 11.8 21 September 2011 15 November 2011
19 April 2012 14 October 2012 1.97552 11.0 2 December 2012 20 January 2013
23 July 2013 29 January 2014 1.75906 10.6 16 March 2014 3 May 2014
8 November 2014 22 April 2015 2.26743 11.5 15 June 2015 8 August 2015
17 January 2016 23 June 2016 2.53523 11.9 18 August 2016 13 October 2016
15 March 2017 29 August 2017 2.26878 11.5 22 October 2017 13 December 2017
28 May 2018 2 December 2018 1.76077 10.6 17 January 2019 5 March 2019
17 September 2019 13 March 2020 1.97299 11.0 2 May 2020 21 June 2020
13 December 2020 22 May 2021 2.45648 11.8 17 July 2021 10 September 2021
Minor planets
Previous minor planet 24 Themis Next minor planet
 v • d • e 
Small Solar System bodies
Vulcanoids | Near-Earth asteroids | Main belt | Jupiter Trojans | Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud)
For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system
For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.


 

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