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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1190429638317609 3.1042e-08  
a 2.972312601201285 1.1252e-08 au
q 2.618479699719793 9.0484e-08 au
i .3956847550212892 3.7326e-06 deg
node 5.644999737152812 0.00050853 deg
peri 69.685779778054 0.00050879 deg
M 253.4639862178572 1.7165e-05 deg
tp 2459754.403479197378
(2022-Jun-23.90347920)
9.0313e-05 TDB
period 1871.716853596786
5.12
1.0629e-05
2.91e-08
d
yr
n .1923367839041497 1.0922e-09 deg/d
Q 3.326145502682777 1.2592e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3663  
   data-arc span      42394 days (116.07 yr)  
   first obs. used      1904-11-17  
   last obs. used      2020-12-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44368  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:47:38  

Additional Information
 Earth MOID = 1.63317 au 
 Jupiter MOID = 1.91324 au 
 T_jup = 3.251 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455929.5 (2012-Jan-03.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1251013546732901 3.1573e-08  
q 2.597001461780832 9.3618e-08 au
tp 2456010.828586421118
(2012-Mar-24.32858642)
7.8715e-05 TDB
node 6.172809139143064 0.00050583 deg
peri 67.87532482776005 0.00050606 deg
i .3981086714593 3.7355e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3663  
   data-arc span      42394 days (116.07 yr)  
   first obs. used      1904-11-17  
   last obs. used      2020-12-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44368  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:47:38  

Additional Information
 Jupiter MOID = 1.91324 au 
 T_jup = 3.251 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.968464460898607E-16 -2.942120424369842E-15 -1.314647344408512E-13 7.899290180044509E-16 -3.970989673318886E-14 -5.777712261344651E-18
q -2.942120424369842E-15 8.764285730440688E-15 5.710548044006657E-13 4.522174093853298E-15 1.422540695744147E-13 -7.185779940873767E-18
tp -1.314647344408512E-13 5.710548044006657E-13 6.196036539219139E-9 -2.333368577366114E-11 1.226981614292383E-9 1.382102355522804E-14
node 7.899290180044509E-16 4.522174093853298E-15 -2.333368577366114E-11 2.558591250906503E-7 -2.558567517392888E-7 4.390594484981678E-11
peri -3.970989673318886E-14 1.422540695744147E-13 1.226981614292383E-9 -2.558567517392888E-7 2.560954416135756E-7 -4.389796122777047E-11
i -5.777712261344651E-18 -7.185779940873767E-18 1.382102355522804E-14 4.390594484981678E-11 -4.389796122777047E-11 1.395367472367681E-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 9.68   n/a E2021B10 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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