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JPL Small-Body Database Browser
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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 | 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.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2036249333721772 3.9318e-08  
a 2.768576657659692 1.0581e-08 au
q 2.204825420207972 1.0948e-07 au
i 9.804560918906443 4.7431e-06 deg
node 263.0268772724938 2.6487e-05 deg
peri 152.746640052682 2.8888e-05 deg
M 312.433629652518 1.3261e-05 deg
tp 2458822.821143973125
6.2606e-05 TDB
period 1682.60918892168
n .2139534256500229 1.2265e-09 deg/d
Q 3.332327895111411 1.2735e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2293  
   data-arc span      37255 days (102.00 yr)  
   first obs. used      1917-08-18  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42311  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:10:58  

Additional Information
 Earth MOID = 1.22183 au 
 Jupiter MOID = 2.03223 au 
 T_jup = 3.287 
[ 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 7.91   n/a PDS3 (MPC 17259)  
diameter diameter 76 km n/a DASTCOM value unverified
rotation period rot_per 7.717 h n/a LCDB (Rev. 2019-January); 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

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Alternate Designations
 A908 QH = A910 CH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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