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1125 China (1957 UN1)
Classification: Main-belt Asteroid          SPK-ID: 2001125
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2176065804700647 3.4075e-08  
a 3.12796597841227 1.1729e-08 au
q 2.447299998023276 1.0647e-07 au
i 3.040617577534687 3.9513e-06 deg
node 97.16370287083865 7.0442e-05 deg
peri 10.55165772883787 7.095e-05 deg
M 33.34372655582604 8.0086e-06 deg
tp 2458813.344285124266
(2019-Nov-25.84428512)
4.475e-05 TDB
period 2020.651688180663
5.53
1.1366e-05
3.112e-08
d
yr
n .1781603440641142 1.0021e-09 deg/d
Q 3.808631958801264 1.4282e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2862  
   data-arc span      40680 days (111.38 yr)  
   first obs. used      1909-01-27  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45361  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:26:23  

Additional Information
 Earth MOID = 1.46417 au 
 Jupiter MOID = 1.33738 au 
 T_jup = 3.175 
[ 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 11.6   n/a MPO267711  
diameter diameter 26.084 km 0.199 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.367 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Menzies, K.T. (2009) Minor Planet Bull. 36, 83-84.]
[Stephens, R.D. (2014) Minor Planet Bull. 41, 92-95.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.078   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1125 China (1957 UN1)          Discovered 1957-Oct-30 by Chang, Y. C. at Nanking
The original planet 1125 China was discovered 1928 Oct. 25 as 1928 UF by Y. C. Chang at Williams Bay and not observed again for many years. It was believed to have been recovered as 1957 UN1 on 1957 Oct. 30 by Chang at Nanking, but this identification was found to be incorrect. In agreement with the discoverer, the designation 1125 China was assigned to planet 1957 UN1. In 1986 C. M. Bardwell and S. Nakano independently identified 1986 QK1 with 1928 UF, and subsequently the permanent number 3789 was assigned to 1928 UF = 1986 QK1.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1951-Nov-19 16:04 00:01 Jupiter 1.96610415827742 1.96610318492327 1.96610513163157 3.4745097673853 3.348222341917 2433970.169447207 1.3217785858597 61.8670335134925 22.3564357722962 60.8716008747697 1936689.33934359 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
1962-Feb-20 03:54 00:01 Jupiter 1.43637498021241 1.43637432916825 1.43637563125693 0.909181922151722 n/a 2437715.662719931 1.13846310461458 57.4366064179193 21.3272480208633 -62.6793531469952 9111315.97054367 F 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
1972-Jun-28 17:35 < 00:01 Jupiter 1.49143163915028 1.49143115841453 1.49143211988605 0.888642252152223 n/a 2441497.232871256 0.828886113195604 71.8058774661425 23.7531230293365 -87.26401553212 9380527.32669435 F 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
2045-Dec-19 10:49 < 00:01 Jupiter 1.63085379763432 1.63085322740391 1.6308543678639 1.70078765797717 1.36159146782562 2468333.950417418 0.662301608587016 73.6781738893867 63.6616642254606 51.8933320339084 1515873.04685337 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
2056-Apr-07 02:31 < 00:01 Jupiter 1.36822106178173 1.36822065086486 1.3682214726986 0.665512960597224 n/a 2472095.605166454 0.843371233306472 64.6373582492295 20.4905602830246 -89.9148054291662 9985625.14337012 F 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
2066-Jul-30 16:01 00:01 Jupiter 1.81766211344149 1.81766111316721 1.81766311371527 1.82279865452142 1.54615774402563 2475862.167641903 1.16236433831899 96.5568267148828 32.0557103778751 -76.8889352382293 1517562.75719897 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
2129-Oct-12 06:19 00:02 Jupiter 1.86278826672301 1.8627865243751 1.86279000907051 2.90525231339423 2.74428084910181 2498945.763280915 2.37813516421304 88.3075956062977 22.0742097468499 60.4995678023938 1249615.56180952 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
2140-Jan-11 22:15 00:03 Jupiter 1.37160980226621 1.37160905987507 1.37161054465953 0.704319485239143 n/a 2502689.427245909 2.56207296711577 107.471526670663 19.1338697751811 -72.5619136028879 10243298.106619 F 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26
2150-May-18 23:57 00:03 Jupiter 1.56636249933892 1.56636049963011 1.56636449902004 1.08833669298065 0.320876054658299 2506469.497773778 2.93152216140972 15181.0430622362 555.768006058606 1.98174616463873 635435.350122194 T 37 CATAB v2.0f-lin.ifort 2020-Jun-23 15:26:36 2020-Jun-23 15:26

Alternate Designations
 1957 UN1 = 1959 EL = 1971 KX = 1974 VM = A909 BE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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