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551 Ortrud (A904 WC)
Classification: Main-belt Asteroid          SPK-ID: 2000551
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1197194586914581 3.1418e-08  
a 2.973817878035893 1.0455e-08 au
q 2.617794011430455 9.2133e-08 au
i .3957313013857401 3.7327e-06 deg
node 5.659772087997225 0.00050954 deg
peri 69.11632215150561 0.0005098 deg
M 215.7208884846609 1.6896e-05 deg
tp 2459751.207815681279
(2022-Jun-20.70781568)
8.9524e-05 TDB
period 1873.138882037878
5.13
9.8777e-06
2.704e-08
d
yr
n .1921907678347581 1.0135e-09 deg/d
Q 3.329841744641331 1.1706e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3637  
   data-arc span      42368 days (116.00 yr)  
   first obs. used      1904-11-17  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44476  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:54:24  

Additional Information
 Earth MOID = 1.63288 au 
 Jupiter MOID = 1.91246 au 
 T_jup = 3.251 
[ 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 9.7   n/a MPO492755 IRAS observations used: 12
diameter diameter 81.113 km 0.711 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 17.416 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Buchheim, R.K. (2007) Minor Planet Bull. 34, 68-71.]
[Marciniak, A.; Bartczak, P.; Muller, T.; Sanabria, J.J.; et al. (2018) Astron. Astrophys. 610, A7.]
geometric albedo albedo 0.040   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.673   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.21, mean=9.40, max.=9.58) deg.
U-B UB 0.289   0.046 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.21, mean=9.40, max.=9.58) deg.
Tholen spectral type spec_T XC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

551 Ortrud (A904 WC)          Discovered 1904-Nov-16 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A904 WC = 1962 DC = 1978 AA = A906 EA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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