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994 Otthild (A923 FB)
Classification: Main-belt Asteroid          SPK-ID: 2000994
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1165763102378791 4.4948e-08  
a 2.52896591925312 7.9463e-09 au
q 2.234148403669245 1.1482e-07 au
i 15.41188991332918 5.0083e-06 deg
node 2.347783245986778 1.35e-05 deg
peri 342.4278469418163 2.1605e-05 deg
M 254.3261870207102 1.7731e-05 deg
tp 2459431.699024224071
7.3013e-05 TDB
period 1468.969883305794
n .2450696941382148 1.1551e-09 deg/d
Q 2.823783434836995 8.8726e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2891  
   data-arc span      35571 days (97.39 yr)  
   first obs. used      1923-03-18  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38762  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:26:11  

Additional Information
 Earth MOID = 1.23235 au 
 Jupiter MOID = 2.61579 au 
 T_jup = 3.393 
[ 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 10.2   n/a MPO473776 IRAS observations used: 4
diameter diameter 20.786 km 1.371 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.95 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Behrend, R. (2001) Observatoire de Geneve web site,]
[Behrend, R. (2005) Observatoire de Geneve web site,]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
geometric albedo albedo 0.310   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.860   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.74 deg.
U-B UB 0.420   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.74 deg.
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)

994 Otthild (A923 FB)          Discovered 1923-Mar-18 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2156-Feb-11 14:15 < 00:01 David 0.0427023761057883 0.0426919667990864 0.0427127862238682 7.96801254055459 7.96801249615479 2508564.093916580 0.425707648486741 596.421174129814 28.8319270603291 -29.5620291684823 109679.907869455 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:26:24 2020-Aug-24 22:26

Alternate Designations
 A923 FB = 1960 KC = 1967 CM = 1967 EK1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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