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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06428607665058227 3.5668e-08  
a 2.856737724364784 1.3411e-08 au
q 2.67308926404566 1.0182e-07 au
i 2.56704031538045 4.2037e-06 deg
node 153.7933151076981 8.6743e-05 deg
peri 253.923288538528 9.2676e-05 deg
M 134.6357927412317 3.3932e-05 deg
tp 2457940.928300817431
(2017-Jul-06.42830082)
0.00016513 TDB
period 1763.615802835526
4.83
1.2419e-05
3.4e-08
d
yr
n .204126091080152 1.4374e-09 deg/d
Q 3.040386184683909 1.4273e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2300  
   data-arc span      25373 days (69.47 yr)  
   first obs. used      1949-11-21  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46016  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:32:08  

Additional Information
 Earth MOID = 1.68354 au 
 Jupiter MOID = 2.21041 au 
 T_jup = 3.299 
[ 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. 2019-January); 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.]
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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