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675 Ludmilla (A908 QH)
Classification: Main-belt Asteroid          SPK-ID: 2000675
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2039655502783431 1.0288e-08  
a 2.76929051827609 7.8975e-09 au
q 2.204450653835309 2.7148e-08 au
i 9.803780336666984 3.0717e-07 deg
node 263.0227789756635 2.199e-06 deg
peri 152.6867069410868 7.3691e-06 deg
M 80.81016320799337 5.3903e-06 deg
tp 2458822.654122613108
2.4764e-05 TDB
period 1683.260006655032
n .2138707024325913 9.1488e-10 deg/d
Q 3.33413038271687 9.5084e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2868  
   data-arc span      39187 days (107.29 yr)  
   first obs. used      1913-12-09  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41536  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:43:55  

Additional Information
 Earth MOID = 1.22113 au 
 Jupiter MOID = 2.03222 au 
 T_jup = 3.286 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.13   n/a MPCxxxxx  
diameter diameter 76 km n/a DASTCOM value unverified
rotation period rot_per 7.717 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Dvorak, R. (1975) Astron. Astrophys. 44, 81-84.]
[Chang, Y.C.; Zhou, X.-h.; Yang, X.-y.; Zhang, Y.-y.; et al. (1981) Acta Astron. Sin. 22, 169-173; Chin. Astron. Astrophys. 5, 434-437.]
[Velichko, F.P.; Michalowski, T.; Erikson, A.; Krugly, Yu.N.; et al. (1995) Astron. Astrophys. Suppl. Ser. 110, 125-129.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2005) Observatoire de Geneve web site,]
[Menke, J. (2005) Minor Planet Bull. 32, 64-66.]
[Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT).]
B-V BV 0.847   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=9.02 deg.
U-B UB 0.444   0.055 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=9.02 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B S   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)

675 Ludmilla (A908 QH)          Discovered 1908-Aug-30 by Metcalf, J. H. at Taunton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A908 QH = A910 CH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2021-Jun-13 23:42 UT
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