22899 Alconrad

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22899 Alconrad
Synodic rotation period
4.03±0.03 h[7]
5.0206±0.0029 h[8]
0.181±0.029[5][6]
0.21[4]
0.24 (assumed)[3]
S [3]
13.677±0.004 (R)[8] · 13.7[3][5] · 13.8[1] · 13.96±0.25[9]

22899 Alconrad (

provisional designation 1999 TO14) is a Koronian asteroid and binary system from the outer region of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 11 October 1999, by Croatian astronomers Korado Korlević and Mario Jurić at the Višnjan Observatory, Croatia.[2]

When its minor-planet moon was discovered in 2003, it was the smallest known main-belt asteroid to possess a satellite. It was later named after American astronomer Albert R. Conrad.

Classification and orbit

Alconrad belongs to the Koronis family, a collisional group of stony asteroids consisting of a few hundred known bodies with nearly ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.6–3.1 AU once every 4 years and 10 months (1,752 days). Its orbit has an eccentricity of 0.08 and an inclination of 3° with respect to the ecliptic.[1] The body's observation arc begins 5 years prior to its official discovery observation, with a precovery taken by Steward Observatory's Spacewatch program in October 1994.[2]

Physical characteristics

Rotation period

In December 2009, a rotational

U=2).[7]

In October 2013, photometric observations by astronomers in the R-band at the

U=2).[8]

Diameter and albedo

According to the survey carried out by the

albedo of 0.18,[5][6] while he Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Koronis family of 0.24, and calculates a diameter of 4.9 kilometers with an absolute magnitude of 13.7.[3]

Satellite

In October 2003, when the asteroid moon S/2003 (22899) 1 was discovered by the researchers at Southwest Research Institute using the Hubble Space Telescope, they calculated a diameter of 4.5 kilometers for the primary, based on an assumed albedo of 0.21. The researchers also measured a large angular separation of 0".14 between Alconrad and its moon. This is equivalent to a distance of 170 kilometers,[4] or 182 kilometers, when using a/Rp ratio of 81.[7] Based on a difference in magnitude of 2.5, the satellite measures 1 to 1.5 kilometers in diameter.[4][7]

When the binary nature of Alconrad was discovered in 2003, it was the smallest binary asteroid known at the time.[4][a] Since then, other binaries with a smaller primary have been discovered such as, for example, 4868 Knushevia (1.5 km) in 2015, and 8026 Johnmckay (1.7 km) in 2010.

Naming

This

M.P.C. 100606).[10]

Notes

  1. ^ a b IAUC No. 8232, S/2003 (22899) 1, 26 October 2003
    Reports the "discovery on July 26.6 UT, on six direct images (two sets of three images taken 20 min apart in time) made with the Hubble Space Telescope (+ ACS/HRC) in the F606W (600-nm broadband) filter, of a satellite of minor planet (22899) 1999 TO_14 (V about 18). The satellite is clearly separated in five of these images but streaked in a sixth due to pointing jitter. Trails of several background stars in successive images indicate that the target object is not a background binary star. On July 26.6545, the satellite was at separation 0".14 (projected separation 170 km) in p.a. 235 deg. Using the average albedo of the Koronis family (about 0.21), to which (22899) belongs, the size of the primary is estimated to be 4.5 km. The brightness difference is about 2.5 mag, giving an estimated diameter of the secondary of about 1.5 km. This then is the smallest main-belt asteroid known to be binary."
    reported by: W. J. Merline, Southwest Research Institute (SwRI); P. M. Tamblyn, Binary Astronomy and SwRI; C. R. Chapman, D. Nesvorny, and D. D. Durda, SwRI; C. Dumas, JPL; A. D. Storrs, Towson University; L. M. Close, University of Arizona; and F. Menard, Observatoire de Grenoble, France. Central Bureau for Astronomical Telegrams – IAUC 8232

References

  1. ^ a b c d "JPL Small-Body Database Browser: 22899 Alconrad (1999 TO14)" (2016-05-03 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2017.
  2. ^ a b c d "22899 Alconrad (1999 TO14)". Minor Planet Center. Retrieved 22 June 2016.
  3. ^ a b c d e f "LCDB Data for (22899) Alconrad". Asteroid Lightcurve Database (LCDB). Retrieved 22 June 2016.
  4. ^
    Bibcode:2003IAUC.8232....2M
    . Retrieved 22 June 2016.
  5. ^
    doi:10.1088/0004-637X/741/2/90
    . Retrieved 22 June 2016.
  6. ^
    doi:10.1088/0004-637X/741/2/68
    . Retrieved 3 December 2016.
  7. ^
    doi:10.1016/j.icarus.2010.12.020
    .
  8. ^
    doi:10.1088/0004-6256/150/3/75
    . Retrieved 22 June 2016.
  9. doi:10.1016/j.icarus.2015.08.007
    . Retrieved 22 June 2016.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 June 2016.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=22899_Alconrad&oldid=1196963019"