Astronomy:(38984) 2000 UZ4
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 24 October 2000 |
| Designations | |
| (38984) 2000 UZ4 | |
| 2000 UZ4 | |
| Minor planet category | main-belt[1] · (outer)[2][3] Zhongguo[4] · 2:1 res[5] |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 20.39 yr (7,447 d) |
| |{{{apsis}}}|helion}} | 4.1195 AU |
| |{{{apsis}}}|helion}} | 2.5141 AU |
| 3.3168 AU | |
| Eccentricity | 0.2420 |
| Orbital period | 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° |
| 357.34° | |
| Physical characteristics | |
| Mean diameter | 4.87 km (calculated)[3] |
| Rotation period | 19.20±0.390 h[6] |
| Geometric albedo | 0.057 (assumed)[3] |
| C[3][7] | |
| Absolute magnitude (H) | 14.6[2] 14.840±0.190 (R)[6] 15.19±0.14[7] 15.29[3] |
(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 ({{{1}}}).[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
- ↑ 1.0 1.1 1.2 1.3 1.4 "38984 (2000 UZ4)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=38984. Retrieved 26 April 2018.
- ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 38984 (2000 UZ4)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2038984. Retrieved 26 April 2018.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (38984)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=38984%7C. Retrieved 26 April 2018.
- ↑ 4.0 4.1 4.2 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. doi:10.1046/j.1365-8711.2002.05635.x. Bibcode: 2002MNRAS.335..417R.
- ↑ 5.0 5.1 "Asteroid (38984) 2000 UZ4 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=38984.
- ↑ 6.0 6.1 6.2 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. doi:10.1088/0067-0049/219/2/27. Bibcode: 2015ApJS..219...27C.
- ↑ 7.0 7.1 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 26 April 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Discovery Circumstances: Numbered Minor Planets (35001)-(40000) – Minor Planet Center
- (38984) 2000 UZ4 at AstDyS-2, Asteroids—Dynamic Site
- (38984) 2000 UZ4 at the JPL Small-Body Database
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