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JPL Small-Body Database Browser
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1200 Imperatrix (1931 RH)
Classification: Main-belt Asteroid          SPK-ID: 2001200
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 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1053375795825559 3.542e-08  
a 3.063477445720209 1.4568e-08 au
q 2.740778146482292 1.0709e-07 au
i 4.593864844464735 4.4603e-06 deg
node 204.7526298517398 4.7531e-05 deg
peri 52.02921794871001 5.188e-05 deg
M 298.0741365314618 2.0887e-05 deg
tp 2459337.391480102836
(2021-May-02.89148010)
0.00011366 TDB
period 1958.485938571342
5.36
1.397e-05
3.825e-08
d
yr
n .1838154632157377 1.3112e-09 deg/d
Q 3.386176744958127 1.6103e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2618  
   data-arc span      38081 days (104.26 yr)  
   first obs. used      1915-10-02  
   last obs. used      2020-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45446  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:54:44  

Additional Information
 Earth MOID = 1.72907 au 
 Jupiter MOID = 1.65791 au 
 T_jup = 3.220 
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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 10.9   n/a MPO384757  
diameter diameter 42.006 km 0.390 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 17.769 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.065   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1200 Imperatrix (1931 RH)          Discovered 1931-Sep-14 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1931 RH = 1929 CX = 1950 DC1 = 1957 OY = A913 EC = A915 TL = A924 GC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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