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890 Waltraut (A918 EO)
Classification: Main-belt Asteroid          SPK-ID: 2000890
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0603188215998748 3.7066e-08  
a 3.021049445443737 1.3582e-08 au
q 2.838823302899616 1.1507e-07 au
i 10.87618610994541 4.2919e-06 deg
node 160.5296553772885 2.1437e-05 deg
peri 88.2150764231188 4.1877e-05 deg
M 79.27835666242528 3.581e-05 deg
tp 2458578.135590345730
(2019-Apr-04.63559035)
0.00019049 TDB
period 1917.94070761312
5.25
1.2934e-05
3.541e-08
d
yr
n .187701318696145 1.2658e-09 deg/d
Q 3.203275587987859 1.4402e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2679  
   data-arc span      37341 days (102.23 yr)  
   first obs. used      1918-03-11  
   last obs. used      2020-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42288  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:22:27  

Additional Information
 Earth MOID = 1.85291 au 
 Jupiter MOID = 1.86175 au 
 T_jup = 3.216 
[ 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 10.5   n/a MPO502161 IRAS observations used: 3
diameter diameter 28.376 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.581 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Brinsfield, J.W. (2010) Minor Planet Bull. 37, 19-20.]
[Owings, L.E. (2010) Minor Planet Bull. 37, 138.]
[Blaauw, R.C.; Cooke, W.J.; Suggs, R.M. (2011) Minor Planet Bull. 38, 131-132.]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2016) Astron. Astrophys., submitted.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2018) Icarus 299, 84-96.]
[Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2018) Icarus 309, 297-337.]
geometric albedo albedo 0.121   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.770   0.069 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.74, mean=6.89, max.=6.97) deg.
U-B UB 0.330   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.74, mean=6.89, max.=6.97) deg.
Tholen spectral type spec_T CTGU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo

890 Waltraut (A918 EO)          Discovered 1918-Mar-11 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A918 EO = A908 GA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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