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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 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1053375864996101 2.9307e-08  
a 3.063477447683899 1.262e-08 au
q 2.740778127048892 9.2148e-08 au
i 4.593862753012946 4.1883e-06 deg
node 204.7526006608687 4.3329e-05 deg
peri 52.02924680698665 4.7963e-05 deg
M 298.0741358475528 2.0828e-05 deg
tp 2459337.391484147385
(2021-May-02.89148415)
0.00011328 TDB
period 1958.485940454427
5.36
1.2102e-05
3.313e-08
d
yr
n .1838154630389991 1.1359e-09 deg/d
Q 3.386176768318907 1.395e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2975  
   data-arc span      38290 days (104.83 yr)  
   first obs. used      1915-10-02  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4321  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:29:53  

Additional Information
 Earth MOID = 1.72907 au 
 Jupiter MOID = 1.65791 au 
 T_jup = 3.220 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456467.5 (2013-Jun-24.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1044512149813291 2.9721e-08  
q 2.750833537886996 9.3222e-08 au
tp 2457364.851028905275
(2015-Dec-08.35102891)
0.00011463 TDB
node 205.1438354529304 4.3276e-05 deg
peri 49.07689458480316 4.7938e-05 deg
i 4.593176210197493 4.1841e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2975  
   data-arc span      38290 days (104.83 yr)  
   first obs. used      1915-10-02  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4321  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:29:53  

Additional Information
 Jupiter MOID = 1.65791 au 
 T_jup = 3.220 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.833121524033241E-16 -2.750770149152994E-15 -5.202082406525516E-13 -2.757158564998088E-15 -8.226465297096485E-14 -1.469480619274561E-16
q -2.750770149152994E-15 8.690386221925562E-15 1.592985755550357E-12 1.568036708262245E-14 2.336227056899377E-13 -6.211451362836758E-16
tp -5.202082406525516E-13 1.592985755550357E-12 1.314097409580175E-8 1.142634529151102E-11 2.374924140491673E-9 1.932938613982471E-13
node -2.757158564998088E-15 1.568036708262245E-14 1.142634529151102E-11 1.872811739114999E-9 -1.864902289406701E-9 -3.972476338686808E-11
peri -8.226465297096485E-14 2.336227056899377E-13 2.374924140491673E-9 -1.864902289406701E-9 2.298059641400753E-9 3.971753505496811E-11
i -1.469480619274561E-16 -6.211451362836758E-16 1.932938613982471E-13 -3.972476338686808E-11 3.971753505496811E-11 1.750694122893784E-11

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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