1580 Betulia

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1580 Betulia
U–B = 0.249[1]
14.00[19] · 14.5[10] · 14.53[7] · 14.58[5] · 14.8[1] · 14.8±0.3[12] · 14.90[8] · 15.1[4][6]

1580 Betulia, provisional designation 1950 KA, is an eccentric, carbonaceous asteroid, classified as near-Earth object of the Amor group, approximately 4.2 kilometers in diameter. It was discovered on 22 May 1950, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg.[3] The asteroid was named for Betulia Toro, wife of astronomer Samuel Herrick.[2]

Orbit and classification

Betulia orbits the Sun at a distance of 1.1–3.3 AU once every 3 years and 3 months (1,190 days). Its orbit has an eccentricity of 0.49 and an inclination of 52° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Johannesburg in 1950.[3]

Close approaches

Betulia is a

Mars-crosser due to its eccentric orbit.[1]

Physical characteristics

In the

Tholen classification, Betulia is an unusual C-type asteroid, as near-Earth objects are typically of stony rather than carbonaceous composition.[1] Based on images taken by the Sloan Digital Sky Survey, the asteroid has also been characterized as a carbonaceous but "brighter" B-type asteroid.[19]

Rotation period

Several rotational

spheroidal shape.[12] Other observations gave a period between 6.130 and 6.48 hours.[11][13][14][17]

Poles

Photometric and radiometric observations of Betulia were also used to model the asteroid's lightcurve. It gave a concurring period of 6.13836 hours as well as a spin axis of (133.0°, 22.0°) and (136.0°, 22.0°) in ecliptic coordinates (λ, β), respectively.[9][15] The results supersede previously determined rotational poles (also see LCDB summary).[6][11][16]

Diameter and albedo

According to the survey carried out by the

albedo between 0.04 and 0.17.[1][4][5][8][9][10][18]

The Collaborative Asteroid Lightcurve Link takes an albedo of 0.09 and a diameter of 4.2 kilometers as best estimates and adopts an absolute magnitude of 15.1.[6]

Naming

This

M.P.C. 768).[21]

Further reading

References

  1. ^ a b c d e f g h i j k l m n "JPL Small-Body Database Browser: 1580 Betulia (1950 KA)" (2017-01-12 last obs.). Jet Propulsion Laboratory. Retrieved 12 September 2017.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b c "1580 Betulia (1950 KA)". Minor Planet Center. Retrieved 12 September 2017.
  4. ^
    doi:10.1016/j.icarus.2005.05.010
    . Retrieved 12 September 2017.
  5. ^
    doi:10.1006/icar.1997.5865
    . Retrieved 12 September 2017.
  6. ^ a b c d e f "LCDB Data for (1580) Betulia". Asteroid Lightcurve Database (LCDB). Retrieved 12 September 2017.
  7. ^ a b c "1580 Betulia". ERAN – European Asteroid Research Node. Archived from the original on 8 February 2012. Retrieved 12 September 2017.
  8. ^
    doi:10.3847/0004-6256/152/3/63
    .
  9. ^
    doi:10.1016/j.icarus.2006.08.004
    . Retrieved 12 September 2017.
  10. ^
    S2CID 9341381
    . Retrieved 12 September 2017.
  11. ^
    doi:10.1016/0019-1035(78)90087-8
    . Retrieved 12 September 2017.
  12. ^
    Bibcode:1995LPI....26.1511W
    . Retrieved 12 September 2017.
  13. ^
    Bibcode:1976SouSt..26..228A
    . Retrieved 12 September 2017.
  14. ^
    PMID 32455361
    .
  15. ^
    doi:10.1016/j.icarus.2003.09.012
    . Retrieved 12 September 2017.
  16. ^
    ISSN 0019-1035
    . Retrieved 12 September 2017.
  17. ^
    doi:10.1016/0019-1035(77)90063-X
    . Retrieved 12 September 2017.
  18. ^
    doi:10.1016/j.icarus.2004.11.005
    . Retrieved 12 September 2017.
  19. ^
    S2CID 119258489
    . Retrieved 12 September 2017.
  20. ^ "Samuel Herrick (1911–1974), Engineering; Astronomy: Los Angeles". University of California. March 1976. p. 135. Retrieved 12 September 2017.
  21. ISBN 978-3-642-01964-7
    .

External links
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