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Encyclopedia > 17 Thetis
17 Thetis
Discovery A
Discoverer R. Luther
Discovery date April 17, 1852
Alternate
designations B		 A913 CA; A916 YF; 1954 SO1
Category Main belt
Orbital elements C
Epoch October 22, 2004 (JD 2453300.5)
Eccentricity (e) 0.134
Semi-major axis (a) 369.530 Gm (2.470 AU)
Perihelion (q) 319.991 Gm (2.139 AU)
Aphelion (Q) 419.069 Gm (2.801 AU)
Orbital period (P) 1418.027 d (3.88 a)
Mean orbital speed 18.87 km/s
Inclination (i) 5.587°
Longitude of the
ascending node (Ω)		 125.622°
Argument of
perihelion (ω)		 135.906°
Mean anomaly (M) 38.435°
Physical characteristics D
Dimensions 90 km
Mass 7.6×1017 kg
Density 2.0? g/cm³
Surface gravity 0.0252 m/s²
Escape velocity 0.0476 km/s
Rotation period 0.5113 d (12.27 h) 1
Spectral class S
Absolute magnitude 7.76
Albedo (geometric) 0.1715 2
Mean surface
temperature		 ~173 K

17 Thetis (thee'-təs (key)) is a large Main belt asteroid. It is a S-type asteroid, so it has a relatively bright silicate surface. Karl Theodor Robert Luther (April 16, 1822 – February 15, 1900) was a German astronomer who searched for asteroids while working in Düsseldorf. ... April 17 is the 107th day of the year in the Gregorian calendar (108th in leap years). ... 1852 was a leap year starting on Thursday (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. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... October 22 is the 295th day of the year (296th in leap years) in the Gregorian Calendar, with 70 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday 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. ... Approximately 17% of all known asteroids are of an S-type (for stony) composition. ... 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. ... Approximately 17% of all known asteroids are of an S-type (for stony) composition. ... In chemistry, a silicate is a compound containing an anion in which one or more central silicon atoms are surrounded by electronegative ligands. ...


It was discovered by R. Luther on April 17, 1852. It was his first asteroid discovery. Its name comes from Thetis, the mother of Achilles in Greek mythology. Karl Theodor Robert Luther (April 16, 1822 – February 15, 1900) was a German astronomer who searched for asteroids while working in Düsseldorf. ... April 17 is the 107th day of the year in the Gregorian calendar (108th in leap years). ... 1852 was a leap year starting on Thursday (see link for calendar). ... This article is about the Greek sea nymph. ... The Wrath of Achilles, by François-Léon Benouville (1821–1859) (Musée Fabre) In Greek mythology, Achilles, also Akhilleus or Achilleus (Ancient Greek ) was a hero of the Trojan War, the central character and greatest warrior of Homers Iliad, which takes for its theme, not the War... The Oricoli bust of Zeus, King of the Gods, in the collection of the Vatican Museum. ...


One Thetidian stellar occultation was observed from Oregon in 1999. However, the event was not timed. The Pleiades, an open cluster of stars in the constellation of Taurus. ... In this July, 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation. ... Official language(s) None Capital Salem Largest city Portland Area  Ranked 9th  - Total 98,466 sq mi (255,026 km²)  - Width 260 miles (420 km)  - Length 360 miles (580 km)  - % water 2. ... 1999 (MCMXCIX) was a common year starting on Friday, and was designated the International Year of Old Farts by the Sometimes-United Nations. ...


Aspects

Stationary,
retrograde		 Opposition Distance to
Earth (AU)		 Maximum
brightness (mag)		 Stationary,
prograde		 Conjunction
to Sun
May 13, 2004 June 23, 2004 1.12505 10.0 August 4, 2004 March 12, 2005
September 20, 2005 November 9, 2005 1.74593 11.5 December 31, 2005 June 23, 2006
December 24, 2006 February 8, 2007 1.61890 11.0 March 30, 2007 October 19, 2007
June 4, 2008 July 17, 2008 1.15973 9.9 August 26, 2008 March 26, 2009
October 1, 2009 November 20, 2009 1.78755 11.5 January 11, 2010 July 5, 2010
January 8, 2011 February 21, 2011 1.53906 10.9 April 11, 2011 November 8, 2011
June 25, 2012 August 7, 2012 1.22746 10.1 September 18, 2012 April 9, 2013
October 11, 2013 December 1, 2013 1.81341 11.6 January 22, 2014 July 17, 2014
January 24, 2015 March 8, 2015 1.45107 10.8 April 26, 2015 November 30, 2015
July 14, 2016 August 26, 2015 1.31557 10.4 October 9, 2016 April 22, 2017
October 21, 2017 December 12, 2017 1.82324 11.6 February 1, 2018 July 29, 2018
February 11, 2019 March 24, 2019 1.35935 10.6 May 11, 2019 December 22, 2018
July 30, 2020 September 12, 2020 1.41160 10.7 October 20, 2020 May 5, 2021
Minor planets
Previous minor planet 17 Thetis 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.

  Results from FactBites:
 
Article about "Thetis" in the English Wikipedia on 24-Apr-2004 (615 words)
In Greek mythology, silver-footed Thetis is a sea nymph, one of the fifty Nereids, daughters of "the ancient one of the seas," Nereus, and Doris (Hesiod, Theogony), a grand-daughter of Tethys.
When Achilles was killed by Paris, Thetis came from the sea with the Nereids to mourn him, and she collected his ashes in a golden urn and raised a monument to his memory and instituted commemorative festivals.
Thetis was one of the gods behind the Oracle at Delphi, which she received from Gaia and gave to Phoebe.
Thetis (1005 words)
Apollodorus writes that Thetis was once courted by both Zeus and Poseidon - she was given to the mortal Peleus only because of the prophecy by Themis or Prometheus that her son would excel his father.
Eurynome (the Oceanid mother of the Charites) and Thetis with the infant Hephaestus thrown from the Olymp
In spite, she threw a golden apple into the midst of the goddesses that was to be awarded only "to the fairest." (The award was effected by the Judgment of Paris and eventually occasioned the Trojan War).
  More results at FactBites »


 

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