1805 Dirikis

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1805 Dirikis
Synodic rotation period
23.0±0.3 h[8]
23.4543 h[9]
0.0746 (derived)[3]
0.0893±0.0076[7]
0.095±0.007[6]
0.1065±0.026[5]
0.145±0.019[4]
S[3]
11.0[4][5][7] · 11.4[1][3]

1805 Dirikis, provisional designation 1970 GD, is a stony Themistian asteroid from the outer region of the asteroid belt, approximately 26 kilometers in diameter.

It was discovered on 1 April 1970, by Russian astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on the Crimean peninsula.[10] It was named for Latvian astronomer Matiss Dirikis.[2]

Orbit and classification

The S-type asteroid is a member of the Themis family,[3] a dynamical population of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,034 days). Its orbit has an eccentricity of 0.11 and an inclination of 3° with respect to the ecliptic.[1]

It was first observed at the Finnish

Turku Observatory during WWII in 1942. The body's first used observation was its identification as 1955 QL1 at Goethe Link Observatory in 1955, extending the asteroid's observation arc by 15 years prior to its official discovery observation.[10]

Physical characteristics

Rotation period

A rotational

U=n.a.).[9]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite

albedo between 0.089 and 0.145.[4][5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.075 and calculates a diameter of 25.53 kilometers with an absolute magnitude of 11.4.[3]

Naming

This

M.P.C. 3569).[11]

References

  1. ^ a b c d "JPL Small-Body Database Browser: 1805 Dirikis (1970 GD)" (2016-12-25 last obs.). Jet Propulsion Laboratory. Retrieved 3 June 2017.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b c d e f g "LCDB Data for (1805) Dirikis". Asteroid Lightcurve Database (LCDB). Retrieved 16 December 2016.
  4. ^
    doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153
    )
  5. ^
    Bibcode:2004PDSS...12.....T
    . Retrieved 22 October 2019.
  6. ^
    doi:10.1088/0004-637X/741/2/68
    . Retrieved 16 December 2016.
  7. ^
    doi:10.1088/0004-637X/741/2/90
    .
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1805) Dirikis". Geneva Observatory. Retrieved 16 December 2016.
  9. ^
    doi:10.1051/0004-6361/201321993
    .
  10. ^ a b "1805 Dirikis (1970 GD)". Minor Planet Center. Retrieved 16 December 2016.
  11. ISBN 978-3-642-01964-7
    .

External links
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