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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1166420285824182 1.833e-08  
a 2.529788790646113 7.6049e-09 au
q 2.234709094220088 4.7743e-08 au
i 15.41105276647223 1.012e-06 deg
node 2.335541014363809 3.6926e-06 deg
peri 342.2805304986001 1.0329e-05 deg
M 303.4935848015521 1.3007e-05 deg
tp 2459431.185383633514
(2021-Aug-04.68538363)
5.3652e-05 TDB
period 1469.686898671746
4.02
6.6271e-06
1.814e-08
d
yr
n .2449501321168176 1.1045e-09 deg/d
Q 2.824868487072137 8.492e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2971  
   data-arc span      35633 days (97.56 yr)  
   first obs. used      1923-03-18  
   last obs. used      2020-10-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38942  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:46:33  

Additional Information
 Earth MOID = 1.23121 au 
 Jupiter MOID = 2.61531 au 
 T_jup = 3.392 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456537.5 (2013-Sep-02.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1150693565790806 1.8279e-08  
q 2.238470781614198 4.7526e-08 au
tp 2456489.531483180285
(2013-Jul-16.03148318)
4.833e-05 TDB
node 2.430570212083164 3.701e-06 deg
peri 341.6691176063185 1.047e-05 deg
i 15.39557006004611 1.0121e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2971  
   data-arc span      35633 days (97.56 yr)  
   first obs. used      1923-03-18  
   last obs. used      2020-10-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38942  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:46:33  

Additional Information
 Jupiter MOID = 2.61531 au 
 T_jup = 3.392 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.341240430289293E-16 -8.597784869219912E-16 -3.144435031580805E-14 4.16866280616377E-14 -6.205848025860976E-14 -1.074577322956201E-14
q -8.597784869219912E-16 2.258711817041196E-15 1.928713712310376E-13 -1.030372708031722E-13 1.821628184356414E-13 2.659775891434455E-14
tp -3.144435031580805E-14 1.928713712310376E-13 2.335779626224211E-9 2.810660014324725E-11 4.637171113341478E-10 -6.866281561227795E-12
node 4.16866280616377E-14 -1.030372708031722E-13 2.810660014324725E-11 1.369747428244476E-11 -9.241641775790053E-12 -3.161973612605407E-12
peri -6.205848025860976E-14 1.821628184356414E-13 4.637171113341478E-10 -9.241641775790053E-12 1.096246382432953E-10 2.115981597795088E-12
i -1.074577322956201E-14 2.659775891434455E-14 -6.866281561227795E-12 -3.161973612605407E-12 2.115981597795088E-12 1.024255159250265E-12

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 10.19   n/a E2021B10 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. 2020-October); 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

[ show close-approach data ]
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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