5143 Heracles

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5143 Heracles
V–R = 0.420±0.070[5]
13.786±0.004 (R)[19] · 13.8[13] · 14.0[1][8][9][22] · 14.10±0.04[5] · 14.27[11][23] · 14.27±0.09[12] · 14.52±0.02 (R)[16]

5143 Heracles(

Carolyn Shoemaker at Palomar Observatory in California, United States.[3] It is named for the Greek divine hero Heracles.[2] It has an Earth minimum orbit intersection distance of 0.058 AU (8.7 million km) and is associated with the Beta Taurids daytime meteor shower.[24]

Classification and orbit

Heracles orbits the Sun in the inner main-belt at a distance of 0.4–3.2 AU once every 2 years and 6 months (907 days). Its orbit has an eccentricity of 0.77 and an inclination of 9° with respect to the ecliptic.[1] The first precovery was taken at Palomar during the Digitized Sky Survey in 1953, extending the body's observation arc by 38 years prior to its official discovery observation.[3]

Due to its high eccentricity, Heracles is also a

lunar distances.[1]

Physical characteristics

Spectral type

In the

SMASS taxonomy, Heracles is a rare O-type asteroid, which have spectra similar to those of stony chondritic meteorites of the L6 and LL6 type.[1] However, it has also been characterized as a carbonaceous C-type, as well as a stony Sk and Q-type asteroid.[21][22][25]

Lightcurves

A large number of rotational

U=3/3/3/3/3-).[5][11][15][16][a]

Diameters

According to the surveys carried out by the

albedo between 0.20 and 0.24.[8][9][10][13] The Collaborative Asteroid Lightcurve Link adopts the results from Petr Pravec's revised WISE data, that is, an albedo of 0.1481 and a diameter of 4.83 kilometers with an absolute magnitude of 14.27.[11][12]

Binary system

On 12 July 2012, it was announced that Heracles is an assumed synchronous

retrograde motion approximately every 16 hours. The companion was discovered in December 2011, by a team of astronomers using radar observations from Arecibo Observatory
in Puerto Rico, following months of intensive photometric lightcurve observations (see above). It was designated S/2011 (5143) 1.

The satellite received the nickname Omphale, after the wife of Heracles who birth to his children. A longer orbital period of 40–57 hours cannot be excluded, which would then no longer be a synchronous system. Estimated diameters for Heracles and its moon are 3.6±1.2 and 0.6±0.3 kilometer, respectively.[6][7][11]

Follow-up observations in 2016 confirmed an orbital period of 17 hours for the asteroid moon.[25]

Naming

This

M.P.C. 20523).[26]

Notes

  1. ^ a b Warner (2017c): lightcurve plot of (5143) Heracles, with a rotation period 2.704±0.002 hours and a brightness amplitude of 0.15 mag (Quality Code of 2; 133 points). Observations from 12 to 17 September 2016, at CS3-Palmer Divide Station. Summary figures at Collaborative Asteroid Lightcurve Link (CALL)

References

  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 5143 Heracles (1991 VL)" (2017-07-01 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b c "5143 Heracles (1991 VL)". Minor Planet Center. Retrieved 14 March 2017.
  4. ^ "Heraclean". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  5. ^
    ISSN 1052-8091
    .
  6. ^
    Bibcode:2012CBET.3176....1T
    .
  7. ^ a b Lance A. M. Benner (18 November 2013). "Binary and Ternary near-Earth Asteroids detected by radar". NASA/JPL Asteroid Radar Research. Archived from the original on 8 June 2004. Retrieved 14 March 2017.
  8. ^
    S2CID 3006566
    .
  9. ^
    doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153
    )
  10. ^
    S2CID 14208889
    .
  11. ^ a b c d e f g "LCDB Data for (5143) Heracles". Asteroid Lightcurve Database (LCDB). Retrieved 14 March 2017.
  12. ^
    doi:10.1016/j.icarus.2012.07.026
    .
  13. ^
    S2CID 118700974
    .
  14. ^
    S2CID 239991
    .
  15. ^
    PMID 32455389
    .
  16. ^
    ISSN 1052-8091
    .
  17. ISSN 1052-8091
    .
  18. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (5143) Heracles". Geneva Observatory. Retrieved 14 March 2017.
  19. ^
    S2CID 8342929
    .
  20. doi:10.1088/0004-6256/142/3/85
    .
  21. ^
    S2CID 119278697
    .
  22. ^
    S2CID 119258489
    .
  23. doi:10.1006/icar.1998.5993
    .
  24. doi:10.1051/0004-6361:20010583
    .
  25. ^ a b Taylor, P. A.; Howell, E. S.; Zambrano-Marin, L. F. (2017). "Radar and infrared Observations of Binary Near-Earth Asteroid (5143) Heracles" (PDF). Retrieved 14 March 2017. {{cite journal}}: Cite journal requires |journal= (help)
  26. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 March 2017.

External links

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