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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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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 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
(2021-Aug-05.19902422)
7.3013e-05 TDB
period 1468.969883305794
4.02
6.9235e-06
1.896e-08
d
yr
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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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
(days_HH:MM)
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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