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748 Simeisa (A913 EL)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000748
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 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1881429145505376 3.2847e-08  
a 3.947165239283838 2.5475e-08 au
q 3.204534066952407 1.3732e-07 au
i 2.25871272570541 3.6974e-06 deg
node 265.4647807233179 0.00011408 deg
peri 177.7271076319326 0.0001147 deg
M 324.1400919750637 1.3274e-05 deg
tp 2459285.820554095572
(2021-Mar-12.32055410)
0.00010724 TDB
period 2864.352005671064
7.84
2.773e-05
7.592e-08
d
yr
n .1256828767160057 1.2167e-09 deg/d
Q 4.689796411615269 3.0268e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2872  
   data-arc span      36690 days (100.45 yr)  
   first obs. used      1920-02-19  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46641  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:21:10  

Additional Information
 Earth MOID = 2.22058 au 
 Jupiter MOID = .563719 au 
 T_jup = 3.028 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456155.5 (2012-Aug-16.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1882565872387305 3.2959e-08  
q 3.208200231060929 1.3898e-07 au
tp 2456437.890790989996
(2013-May-25.39079099)
9.3952e-05 TDB
node 265.6192112358469 0.00011414 deg
peri 179.7860601687682 0.00011476 deg
i 2.255932839330784 3.6974e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2872  
   data-arc span      36690 days (100.45 yr)  
   first obs. used      1920-02-19  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46641  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:21:10  

Additional Information
 Jupiter MOID = .563719 au 
 T_jup = 3.028 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.086263543683227E-15 -4.535604006068621E-15 -2.698034439908792E-13 4.396144310701878E-15 -2.914011686990708E-14 -6.361614680634559E-17
q -4.535604006068621E-15 1.931423828615892E-14 1.5840276361029E-12 -1.109557408627243E-14 1.671973341818169E-13 -1.71859034227496E-16
tp -2.698034439908792E-13 1.5840276361029E-12 8.827030403629419E-9 -1.34708562698743E-13 1.154347671220655E-9 2.609093295863371E-13
node 4.396144310701878E-15 -1.109557408627243E-14 -1.34708562698743E-13 1.302749935470619E-8 -1.301840738191629E-8 4.949406060627927E-12
peri -2.914011686990708E-14 1.671973341818169E-13 1.154347671220655E-9 -1.301840738191629E-8 1.316951305103797E-8 -4.94040221147223E-12
i -6.361614680634559E-17 -1.71859034227496E-16 2.609093295863371E-13 4.949406060627927E-12 -4.94040221147223E-12 1.367087562784815E-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 9.0   n/a MPO502160 IRAS observations used: 12
diameter diameter 103.714 km 1.128 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 11.919 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:
[Dahlgren, M.; Lahulla, J.F.; Lagerkvist, C.-I.; Lagerros, J.; et al. (1998) Icarus 133, 247-285.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.041   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
B-V BV 0.694   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.43, mean=4.47, max.=4.51) deg.
U-B UB 0.206   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.43, mean=4.47, max.=4.51) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

748 Simeisa (A913 EL)          Discovered 1913-Mar-14 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A913 EL = 1925 QG = 1936 BG = 1941 SU = 1942 XU = 1944 DC = 1951 CX = 1957 UL1 = 1963 MC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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