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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2175294342299727 1.8721e-08  
a 3.127196371917473 1.1398e-08 au
q 2.446939114408242 5.7834e-08 au
i 3.040613110571849 4.3352e-07 deg
node 97.16160339997555 1.0349e-05 deg
peri 10.49745523177561 1.2759e-05 deg
M 69.03631772610298 4.461e-06 deg
tp 2458813.147578479534
(2019-Nov-25.64757848)
2.3809e-05 TDB
period 2019.905990649939
5.53
1.1044e-05
3.024e-08
d
yr
n .1782261162977015 9.7444e-10 deg/d
Q 3.807453629426705 1.3878e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3105  
   data-arc span      40962 days (112.15 yr)  
   first obs. used      1909-01-27  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45249  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:12:01  

Additional Information
 Earth MOID = 1.46367 au 
 Jupiter MOID = 1.33866 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 11.71   n/a MPCxxxxx  
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. 2020-October); 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 1.96610417596083 1.96610323016458 1.96610512175719 3.47450992140642 3.34822250361553 2433970.169555057 1.28950264718011 52.8387321531854 7.16507908760777 49.2677431484924 5470325.25892911 T 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
1962-Feb-20 03:55 00:01 Jupiter 1.43637505491926 1.43637451982877 1.43637559001016 0.909182280797808 n/a 2437715.662852135 1.10706301748053 48.384731108654 7.71366621370951 -57.672036297156 23649339.5541647 F 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
1972-Jun-28 17:35 < 00:01 Jupiter 1.49143162573955 1.49143118814685 1.49143206333225 0.88864204023957 n/a 2441497.232960596 0.809842583032827 22.8275527349515 9.03692383968173 -18.6509463088901 12164013.6005485 F 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
2045-Dec-19 10:48 < 00:01 Jupiter 1.63085359449217 1.63085321811452 1.63085397086944 1.70078659183211 1.36159009067854 2468333.950194492 0.619934207368728 43.9010884850051 21.1844535673649 -17.928036906356 2611401.59138803 T 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
2056-Apr-07 02:31 < 00:01 Jupiter 1.36822120334056 1.36822092021636 1.36822148646482 0.665513075013304 n/a 2472095.604858524 0.806522411726688 25.1689764586949 10.5363812274614 65.7242629813384 18014738.8302625 F 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
2066-Jul-30 16:01 00:01 Jupiter 1.81766272691532 1.81766185586428 1.81766359796606 1.82280054291151 1.54616007367475 2475862.167151084 1.1092628739071 65.7816243927065 7.65864124068284 -63.9674679409946 9951286.83758142 T 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
2129-Oct-12 06:18 00:02 Jupiter 1.86278737477534 1.86278576353695 1.86278898601353 2.90524752320294 2.74427569950905 2498945.762452718 2.29352536032939 78.6743646559209 6.42872716222388 56.3903873900301 4336772.77867152 T 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
2140-Jan-11 22:14 00:02 Jupiter 1.37160949578294 1.37160888096486 1.37161011060342 0.704318711994547 n/a 2502689.426473916 2.47346378110648 98.284484765107 7.77201673254184 -72.380443083595 25161275.9396037 F 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13
2150-May-18 23:56 00:03 Jupiter 1.56636328408795 1.56636140704761 1.56636516110452 1.08833851170422 0.320883076895742 2506469.496995590 2.82802662271583 13814.6894081653 77.8283976049281 1.69954438252083 2715574.96509217 T 43 CATAB v2.0g-lin.ifort 2021-May-03 19:13:07 2021-May-03 19:13

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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