(15810) Arawn

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Asteroid
(15810) Arawn
Arawn captured by the New Horizons spacecraft in November 2015
Arawn captured by the New Horizons spacecraft in November 2015
Properties of the orbit ( animation )
Epoch:  4th September 2017 ( JD 2,458,000.5)
Orbit type Plutino
Major semi-axis 39.6  AU
eccentricity 0.122
Perihelion - aphelion 34.75 AU - 44.45 AU
Inclination of the orbit plane 3.8 °
Length of the ascending node 144.7 °
Sidereal period 249 a
Mean orbital velocity 4.72 km / s
Physical Properties
Medium diameter 251 km
Rotation period 5.47 h
Absolute brightness 7.7 likes
history
Explorer Mike Irwin ,
Anna Żytkow
Date of discovery May 12, 1994
Another name 1994 JR 1
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(15810) Arawn (provisional designation 1994 JR 1 ) is a Trans-Neptunian object . It was discovered on May 12, 1994 by Mike Irwin and Anna Żytkow with the Isaac Newton telescope at the Roque de los Muchachos observatory on La Palma . It was classified as a Plutino in 2: 3 resonance to Neptune. The object was named on January 2, 2017 after Arawn , a figure from Celtic mythology.

On November 2, 2015, the New Horizons space probe took several images every hour with the LORRI camera. At the time of the acquisition, the object was approximately 5.3 billion km from the Sun, but only 280 million km from New Horizons. Another observation was made on April 7–8. April 2016 from a distance of 111 million km. Simultaneous observation with Hubble enabled the orbit of the object to be determined much more precisely to less than 1000 km using parallax . The assessment as a possible quasi-satellite to Pluto was thus refuted. The observation also revealed a period of rotation of 5.47 hours and that the surface must be quite uneven.

See also

Individual evidence

  1. ^ A b Mike Irwin, Scott Tremaine, Anna Żytkow: A Search for slow-moving objects and the luminosity function of the Kuiper Belt In: The Astronomical Journal. No. 110 (6), 1995, pp. 3082-3092.
  2. ↑ (15810) Arawn in the Small-Body Database of the Jet Propulsion Laboratory (English). Accessed May 31, 2018.
  3. ↑ (15810) Arawn at the IAU Minor Planet Center (English). Accessed May 31, 2018.
  4. ^ A Distant Close-up: New Horizons' Camera Captures a Wandering Kuiper Belt Object.
  5. ^ New Horizons: Getting to Know a KBO - Pluto New Horizons. Retrieved January 6, 2019 (American English).