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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 ]

[ show orbit diagram ]
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

[ 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
1920-Aug-26 23:46 00:01 Jupiter 1.86457453720256 1.86457397567411 1.86457509873102 4.04776471820752 3.93393655393945 2422563.490339633 1.33319822943814 48.2933747302067 22.1960898119084 76.7484973059358 3252534.6910701 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
1944-Jan-03 11:07 00:01 Jupiter 1.92800855253324 1.92800805768443 1.92800904738206 4.4198392885739 4.31929730076975 2431092.962861154 1.36209712996744 43.2811901413803 21.148519785789 80.6072088661652 3576157.06064576 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
1967-Feb-26 03:48 00:01 Jupiter 1.97435022669478 1.97434981449376 1.97435063889579 4.83450229172309 4.74493264429019 2439547.658557953 1.09918541766163 38.7872086425634 19.0721286398198 87.1466235540061 4813517.8884367 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
1990-Mar-26 10:59 < 00:01 Jupiter 1.95922646183228 1.95922602983103 1.95922689383352 5.02589231917402 4.93912377548621 2447976.957873533 0.620770335463007 39.1007211857185 20.1798259067328 86.3554240578011 5071532.95931671 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2013-May-19 18:42 < 00:01 Jupiter 1.90246266094157 1.90246224856276 1.90246307332038 4.93804005076599 4.84703940960902 2456432.279100132 0.240221442912935 39.0301547472086 19.1565957774508 -89.0574697975286 4932525.09815957 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2036-Sep-24 21:58 < 00:01 Jupiter 1.83530414511179 1.83530375330036 1.83530453692312 4.72143379263107 4.62265126787462 2464961.415472884 0.859430393856667 42.8703003135462 18.0313738740341 89.1776492288586 5027069.5751894 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2060-May-21 21:09 00:01 Jupiter 1.79998678367402 1.79998631014616 1.79998725720197 4.60866058638344 4.50539780280894 2473601.381432795 1.44232116692288 51.6308400417494 20.1949136097519 80.0126896999371 4574358.41935511 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2084-May-11 11:51 00:02 Jupiter 1.81757434349983 1.81757384410678 1.81757484289299 4.66418178484483 4.56317384624793 2482356.993740213 1.68453228470331 53.4938721723243 20.7477508913102 77.6357712688378 4670113.7528089 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2108-Jul-05 08:23 00:02 Jupiter 1.83379145263878 1.83379098670385 1.83379191857371 4.64055276856373 4.53992690202257 2491176.849227074 1.63787641243919 47.5861756584803 20.4139693220251 79.6635371905847 4833978.67955677 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2132-Sep-02 12:42 00:01 Jupiter 1.83881027353142 1.83880981824782 1.83881072881501 4.48514173604128 4.38123544891709 2500002.028862290 1.48584404038369 41.8690324930887 20.6674492207915 82.5644420343736 4710281.33135214 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2156-Aug-31 23:23 00:01 Jupiter 1.83843231253721 1.83843182013783 1.83843280493658 4.33310155918617 4.22543576279015 2508766.474284251 1.41279707819878 40.3006366230779 22.3933244713466 86.4750223030172 3983616.96304817 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21
2180-May-09 18:14 00:01 Jupiter 1.86713060084119 1.86713005969824 1.86713114198414 4.4320980206288 4.32853257315939 2517418.259716857 1.39163148901166 40.4803364997824 24.5913894233199 89.0219835815854 3497125.37911224 T 102 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:22 2020-Aug-24 22:21

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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