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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 101 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1881429149320184 3.2859e-08  
a 3.947165236519266 2.6277e-08 au
q 3.204534063202202 1.3739e-07 au
i 2.258712478733413 3.7212e-06 deg
node 265.464769457562 0.00011513 deg
peri 177.7271177645458 0.00011577 deg
M 324.1400935854329 1.3784e-05 deg
tp 2459285.820540982861
(2021-Mar-12.32054098)
0.00011143 TDB
period 2864.352002661801
7.84
2.8603e-05
7.831e-08
d
yr
n .125682876848047 1.2551e-09 deg/d
Q 4.689796409836331 3.1221e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2820  
   data-arc span      36509 days (99.96 yr)  
   first obs. used      1920-02-19  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46909  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:36:03  

Additional Information
 Earth MOID = 2.22058 au 
 Jupiter MOID = .563719 au 
 T_jup = 3.028 
[ 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 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 1.86457451556426 1.86457393271924 1.86457509840929 4.04776461393836 3.93393644531318 2422563.490350890 1.34191277773427 48.5164626553248 23.0668137453853 76.2628437497265 3133366.33751181 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
1944-Jan-03 11:07 00:01 Jupiter 1.92800853502384 1.928008022809 1.92800904723868 4.41983913551443 4.31929714322374 2431092.962888910 1.38107882234466 43.4238758774048 21.8412098221974 80.0838327273366 3447548.41447652 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
1967-Feb-26 03:48 00:01 Jupiter 1.97435021972804 1.97434980205183 1.97435063740424 4.83450219191831 4.74493254228237 2439547.658582439 1.11693280532456 38.794327513563 19.3042546259367 87.1495878052121 4703113.99067126 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
1990-Mar-26 10:59 < 00:01 Jupiter 1.95922646299481 1.9592260307598 1.95922689522982 5.02589228791425 4.93912374372922 2447976.957886567 0.627720451564647 39.2280330323918 20.1904151877025 86.386953834986 5058884.34150705 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2013-May-19 18:42 < 00:01 Jupiter 1.90246266145451 1.90246224886396 1.90246307404506 4.93804004651872 4.84703940530679 2456432.279094357 0.249680981105993 39.3596806935676 19.1667934649714 -89.0915924271241 4928886.4382984 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2036-Sep-24 21:58 < 00:01 Jupiter 1.83530413759555 1.83530374114436 1.83530453404673 4.72143378052308 4.62265125509901 2464961.415450982 0.897783967499245 43.6589707537474 18.2360370111656 88.6803199579968 4985510.0278539 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2060-May-21 21:09 00:02 Jupiter 1.79998676768678 1.79998627995953 1.79998725541414 4.60866050348633 4.50539771708416 2473601.381384483 1.50191779710432 53.0263343223146 20.5542537963138 79.2833923852677 4499734.21322182 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2084-May-11 11:51 00:02 Jupiter 1.81757432655946 1.81757381054702 1.817574842572 4.66418172884727 4.56317378805899 2482356.993693016 1.75060426996666 54.8672677937613 21.1339383623558 76.8485449332617 4593324.4512509 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2108-Jul-05 08:23 00:02 Jupiter 1.83379143974747 1.83379096098364 1.8337919185113 4.64055273568854 4.53992686770348 2491176.849181618 1.69269458706546 48.3360635516834 20.8077859343365 78.8611907072856 4772951.43665993 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2132-Sep-02 12:42 00:02 Jupiter 1.83881026207979 1.83880979498182 1.83881072917776 4.48514169231244 4.38123540349639 2500002.028834259 1.51538171809658 42.0399235745614 21.1779152828395 81.995944550986 4643079.07123007 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2156-Aug-31 23:23 00:01 Jupiter 1.83843229786252 1.83843178946085 1.83843280626419 4.33310151900033 4.22543572071 2508766.474267663 1.41866283235144 40.3186941655759 23.1357600790603 86.4398719923621 3882113.04507112 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36
2180-May-09 18:14 00:01 Jupiter 1.86713058354391 1.86713002261895 1.86713114446887 4.43209789703541 4.32853244563796 2517418.259721874 1.39173218739044 40.5139449883752 25.4801105466167 89.4183023765969 3377323.87626565 T 101 CATAB v2.0f-lin.ifort 2020-Feb-22 15:36:17 2020-Feb-22 15:36

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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