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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1165763129994117 4.4684e-08  
a 2.528965919527273 7.9353e-09 au
q 2.234148396927617 1.142e-07 au
i 15.41188950171745 4.9811e-06 deg
node 2.347783413105557 1.3495e-05 deg
peri 342.4278471281868 2.16e-05 deg
M 254.3261864198673 1.7717e-05 deg
tp 2459431.699026745910
(2021-Aug-05.19902675)
7.2954e-05 TDB
period 1468.96988354466
4.02
6.914e-06
1.893e-08
d
yr
n .2450696940983646 1.1535e-09 deg/d
Q 2.82378344212693 8.8604e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2937  
   data-arc span      35633 days (97.56 yr)  
   first obs. used      1923-03-18  
   last obs. used      2020-10-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39071  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:23:38  

Additional Information
 Earth MOID = 1.23235 au 
 Jupiter MOID = 2.61579 au 
 T_jup = 3.393 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456386.5 (2013-Apr-04.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1151714085080682 4.4354e-08  
q 2.238474156568282 1.1311e-07 au
tp 2456489.483118997837
(2013-Jul-15.98311900)
7.0786e-05 TDB
node 2.43225273346598 1.352e-05 deg
peri 341.6530015053558 2.1846e-05 deg
i 15.3948548250208 4.9755e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2937  
   data-arc span      35633 days (97.56 yr)  
   first obs. used      1923-03-18  
   last obs. used      2020-10-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39071  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:23:38  

Additional Information
 Jupiter MOID = 2.61579 au 
 T_jup = 3.393 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.967233207630585E-15 -5.007131995060261E-15 9.178320821037943E-13 5.188171230521664E-15 1.983083528916428E-13 6.291929008049577E-15
q -5.007131995060261E-15 1.279402390662728E-14 -2.228234953221402E-12 -1.321736287815337E-14 -4.817246021795664E-13 -1.579940289636372E-14
tp 9.178320821037943E-13 -2.228234953221402E-12 5.010722366369228E-9 -9.775223811756298E-12 1.224006695056374E-9 3.221507848573694E-12
node 5.188171230521664E-15 -1.321736287815337E-14 -9.775223811756298E-12 1.827901751811673E-10 -1.781412836690434E-10 4.227561353082617E-12
peri 1.983083528916428E-13 -4.817246021795664E-13 1.224006695056374E-9 -1.781412836690434E-10 4.772666239866899E-10 -3.482391940128297E-12
i 6.291929008049577E-15 -1.579940289636372E-14 3.221507848573694E-12 4.227561353082617E-12 -3.482391940128297E-12 2.475554550903417E-11

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

[ hide close-approach data ]
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 39 CATAB v2.0f-lin.ifort 2020-Nov-13 04:23:45 2020-Nov-13 04:23

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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