(13366) 1998 US24

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(13366) 1998 US24
Discovery[1]
Discovered byLONEOS
Discovery siteAnderson Mesa
Discovery date18 October 1998
Designations
(13366) 1998 US24
1998 US24 · 1996 RX29
Minor planet category
Jupiter trojan[1][2]
Greek[3] · background[4]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc64.27 yr (23,476 d)
Aphelion5.7685 AU
Perihelion4.6895 AU
5.2290 AU
Eccentricity0.1032
11.96 yr (4,367 d)
193.23°
0° 4m 56.64s / day
Inclination6.6365°
96.296°
355.47°
Jupiter MOID0.3771 AU
TJupiter2.9760
Physical characteristics
Mean diameter
33.30±2.87 km[5]
400±105 h[6]
0.058±0.016[5]
C (assumed)[7]
Absolute magnitude (H)
11.10[5]
11.2[1][7]
11.3[2]

(13366) 1998 US24, provisional designation 1998 US24, is a Jupiter trojan from the Greek camp, approximately 33 kilometers (21 miles) in diameter. It was discovered on 18 October 1998, by astronomers with the Lowell Observatory Near-Earth-Object Search at the Anderson Mesa Station near Flagstaff, Arizona, in the United States.[1] The dark Jovian asteroid is a slow rotator with a long rotation period of potentially 400 hours.[7] It has not been named since its numbering in January 2000.[8]

Orbit and classification[]

1998 US24 is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's L4 Lagrangian point, 60° ahead of its orbit (see Trojans in astronomy).[3] It is also a non-family asteroid in the Jovian background population.[4] It orbits the Sun at a distance of 4.7–5.8 AU once every 11 years and 12 months (4,367 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.10 and an inclination of 7° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in February 1954, more than 44 years prior to its official discovery observation at Anderson Mesa.[1]

Numbering and naming[]

This minor planet was numbered by the MPC on 24 January 2000 (M.P.C. 37586).[8] As of 2018, it has not been named.[1]

Physical characteristics[]

1998 US24 is an assumed C-type asteroid, while most larger Jupiter trojans are D-types.[7]

Rotation period[]

In August 2015, a first rotational lightcurve of 1998 US24 was obtained from photometric observations by the Kepler space telescope during its K2 mission. Lightcurve analysis gave a rotation period of 400±105 hours with a brightness variation of 0.23 magnitude (U=2-).[6] One month later, a second, lower-rated lightcurve by Kepler determined an alternative period of 522±36 hours with an amplitude of 0.20 (U=1+).[9] As of 2018, no secure period of this slow rotator has yet been obtained.[7]

Diameter and albedo[]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1998 US24 measures 33.30 kilometers in diameter and its surface has an albedo of 0.058,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 32.03 kilometers based on an absolute magnitude of 11.2.[7]

100+ largest Jupiter trojans

References[]

  1. ^ Jump up to: a b c d e f "13366 (1998 US24)". Minor Planet Center. Retrieved 4 July 2018.
  2. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 13366 (1998 US24)" (2018-05-21 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2018.
  3. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 July 2018. Retrieved 4 July 2018.
  4. ^ Jump up to: a b "Asteroid (13366) 1998 US24 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 4 July 2018.
  5. ^ Jump up to: a b c d Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
  6. ^ Jump up to: a b Szabó, Gy. M.; Pál, A.; Kiss, Cs.; Kiss, L. L.; Molnár, L.; Hanyecz, O.; et al. (March 2017). "The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids". Astronomy and Astrophysics. 599: 13. arXiv:1609.02760. Bibcode:2017A&A...599A..44S. doi:10.1051/0004-6361/201629401. S2CID 119275951.
  7. ^ Jump up to: a b c d e f "LCDB Data for (13366)". Asteroid Lightcurve Database (LCDB). Retrieved 4 July 2018.
  8. ^ Jump up to: a b "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 July 2018.
  9. ^ Ryan, Erin Lee; Sharkey, Benjamin N. L.; Woodward, Charles E. (March 2017). "Trojan Asteroids in the Kepler Campaign 6 Field". The Astronomical Journal. 153 (3): 12. Bibcode:2017AJ....153..116R. doi:10.3847/1538-3881/153/3/116.

External links[]

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