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2230 Yunnan (1978 UT1)
Classification: Main-belt Asteroid          SPK-ID: 2002230
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06336935695953386 3.4483e-08  
a 2.85919321664382 1.2458e-08 au
q 2.67800798108204 9.909e-08 au
i 2.566914868442632 3.9647e-06 deg
node 153.7600224665801 8.4795e-05 deg
peri 253.7290954273957 9.0691e-05 deg
M 216.4938920612059 3.398e-05 deg
tp 2459704.433395732813
(2022-May-04.93339573)
0.00016836 TDB
period 1765.890149929338
4.83
1.1541e-05
3.16e-08
d
yr
n .2038631904789804 1.3324e-09 deg/d
Q 3.0403784522056 1.3247e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2557  
   data-arc span      25878 days (70.85 yr)  
   first obs. used      1949-11-21  
   last obs. used      2020-09-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4452  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:11:28  

Additional Information
 Earth MOID = 1.68892 au 
 Jupiter MOID = 2.20658 au 
 T_jup = 3.298 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.0   n/a MPO473795  
diameter diameter 11.431 km 0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.0381 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.258   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2230 Yunnan           Discovered 1978 Oct. 29 at the Purple Mountain Observatory.
Named for a province along the southwestern border of China. The Yunnan Observatory is situated in its capital city of Kunming.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 6059Last Updated: 2006-03-21

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Alternate Designations
 1978 UT1 = 1953 RW = 1956 EY = 1964 YK = 1976 JW1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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