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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1052930556802878 1.2201e-08  
a 3.062962787888711 1.2187e-08 au
q 2.740454076516896 3.9014e-08 au
i 4.594255206112655 1.2522e-06 deg
node 204.7518505600799 9.3539e-06 deg
peri 52.12744028585548 1.5578e-05 deg
M 334.753159239462 1.1451e-05 deg
tp 2459337.814230593957
(2021-May-03.31423059)
6.2139e-05 TDB
period 1957.992426961028
5.36
1.1686e-05
3.199e-08
d
yr
n .1838617938674824 1.0974e-09 deg/d
Q 3.385471499260527 1.347e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3052  
   data-arc span      38508 days (105.43 yr)  
   first obs. used      1915-10-02  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42826  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:08:12  

Additional Information
 Earth MOID = 1.72711 au 
 Jupiter MOID = 1.65777 au 
 T_jup = 3.220 
[ 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 10.95   n/a E2021B10  
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. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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

[ show close-approach data ]
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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