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(38984) 2000 UZ₄
Discovery
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	24 October 2000
Designations
MPC designation	(38984) 2000 UZ4
Alternative designations	2000 UZ4
Minor planet category	main-belt · (outer); Zhongguo · 2:1 res
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 0
Observation arc	20.39 yr (7,447 d)
Aphelion	4.1195 AU
Perihelion	2.5141 AU
Semi-major axis	3.3168 AU
Eccentricity	0.2420
Orbital period (sidereal)	6.04 yr (2,206 d)
Mean anomaly	312.38°
Mean motion	0° 9m 47.52s / day
Inclination	0.4882°
Longitude of ascending node	59.710°
Argument of perihelion	357.34°
Physical characteristics
Mean diameter	4.87 km (calculated)
Synodic rotation period	19.20±0.390 h
Geometric albedo	0.057 (assumed)
Spectral type	C
Absolute magnitude (H)	14.6; 14.840±0.190 (R); 15.19±0.14; 15.29

(38984) 2000 UZ₄ (provisional designation 2000 UZ₄) is carbonaceous Zhongguo asteroid from the outermost regions of the asteroid belt, approximately 5 kilometers (3 miles) in diameter. It was discovered on 24 October 2000, by astronomers with Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States.^[1] The likely elongated C-type asteroid has a rotation period of 19.20 hours.^[3]

Orbit and classification

2000 UZ₄ is a non-family asteroid from the main belt's background population, and a member of the small group of Zhongguo asteroids,^[4] located in the Hecuba gap and locked in a 2:1 mean-motion resonance with the gas giant Jupiter. Contrary to the nearby unstable Griqua group, the orbits of the Zhongguos are stable over half a billion years.^[4]^[5]

It orbits the Sun in the outer main-belt at a distance of 2.5–4.1 AU once every 6.04 years (2,206 days; semi-major axis of 3.32 AU). Its orbit has an eccentricity of 0.24 and an inclination of 0° with respect to the ecliptic.^[2] The body's observation arc begins with a precovery taken by Spacewatch in February 1996, more than 4 years prior to its official discovery observation at Socorro.^[1]

Physical characteristics

2000 UZ₄ has been characterized as a carbonaceous C-type asteroid by Pan-STARRS' large-scale survey.^[3]

Rotation period

In January 2014, a rotational lightcurve of this asteroid was obtained from photometric observations in the R-band by astronomers at the Intermediate Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 19.20 hours with a high brightness amplitude of 0.70 magnitude, indicative of an elongated shape (U=2).^[6]

Diameter and albedo

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 4.87 kilometers based on an absolute magnitude of 15.29.^[3]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 28 March 2002, after its orbit had sufficiently been secured (M.P.C. 45198).^[8] As of 2018, it has not been named.^[1]

References

^ ^a ^b ^c ^d ^e "38984 (2000 UZ4)". Minor Planet Center. Retrieved 26 April 2018.
^ ^a ^b ^c ^d "JPL Small-Body Database Browser: 38984 (2000 UZ4)" (2016-07-01 last obs.). Jet Propulsion Laboratory. Retrieved 26 April 2018.
^ ^a ^b ^c ^d ^e ^f ^g ^h "LCDB Data for (38984)". Asteroid Lightcurve Database (LCDB). Retrieved 26 April 2018.
^ ^a ^b ^c Roig, F.; Nesvorný, D.; Ferraz-Mello, S. (September 2002). "Asteroids in the 2 : 1 resonance with Jupiter: dynamics and size distribution". Monthly Notices of the Royal Astronomical Society. 335 (2): 417–431. Bibcode:2002MNRAS.335..417R. doi:10.1046/j.1365-8711.2002.05635.x.
^ ^a ^b "Asteroid (38984) 2000 UZ4 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
^ ^a ^b ^c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. S2CID 17093124.
^ ^a ^b Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339.
^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 April 2018.