1971 Hagihara

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1971 Hagihara
Discovery
Perihelion
2.7370 AU
2.9924 AU
Eccentricity0.0854
5.18 yr (1,891 days)
294.31°
0° 11m 25.44s / day
Inclination8.6990°
300.12°
120.50°
Physical characteristics
Dimensions12.289±0.156[1][4]
15±7 km (converted)[5]
0.135±0.028[1][4]
12.3[6][1]

1971 Hagihara, provisional designation 1955 RD1, is an Eoan asteroid from the outer region of the asteroid belt, approximately 12 kilometers in diameter.

It was discovered on 14 September 1955, by the Indiana Asteroid Program at the Goethe Link Observatory near Brooklyn, Indiana, United States.[6] It was later named after Japanese astronomer Yusuke Hagihara.[2]

Orbit and classification

Hagihara is a member of the

606), the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[3][7]: 23  It orbits the Sun in the outer main-belt at a distance of 2.7–3.2 AU once every 5 years and 2 months (1,891 days). Its orbit has an eccentricity of 0.09 and an inclination of 9° with respect to the ecliptic.[1] The asteroid's observation arc begins with its discovery observation at Goethe in September 1955.[6]

Physical characteristics

According to the survey carried out by NASA's

rotation period and shape remain unknown.[8]

Naming

This minor planet was named in honour of Yusuke Hagihara (1897–1979) on the occasion of his 81st birthday. He was professor of astronomy at the University of Tokyo and director of the Tokyo Observatory. He also served as vice-president of the International Astronomical Union and was the president of its Commission VII.

Hagihara is best known for the discussion of stability problems in celestial mechanics and his theory of libratory motions, as well as for important contributions to the study of the velocity distribution of free electrons in planetary nebulae, and his important five-volume treatise on celestial mechanics.

M.P.C. 4419).[9]

References

  1. ^ a b c d e f g "JPL Small-Body Database Browser: 1971 Hagihara (1955 RD1)" (2015-05-09 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b "Asteroid 1971 Hagihara – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
  4. ^
    doi:10.1088/0004-637X/741/2/68
    . Retrieved 29 August 2016.
  5. ^ "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 12 November 2017.
  6. ^ a b c "1971 Hagihara (1955 RD1)". Minor Planet Center. Retrieved 29 August 2016.
  7. ISBN 978-0-8165-3213-1
    .
  8. ^ "LCDB Data for (1971) Hagihara". Asteroid Lightcurve Database (LCDB). Retrieved 4 April 2017.
  9. ISBN 978-3-642-01964-7
    .

External links
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