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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1884162499903471 1.6895e-08  
a 3.948661014211978 1.8939e-08 au
q 3.204669113431076 7.1313e-08 au
i 2.258523177723725 7.9037e-07 deg
node 265.4686779645631 3.9236e-05 deg
peri 177.6774336298469 3.8135e-05 deg
M 349.3160403021905 5.9878e-06 deg
tp 2459285.555606369537
(2021-Mar-12.05560637)
4.7974e-05 TDB
period 2865.9803255633
7.85
2.0619e-05
5.645e-08
d
yr
n .125611469412039 9.0368e-10 deg/d
Q 4.69265291499288 2.2507e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3406  
   data-arc span      36914 days (101.07 yr)  
   first obs. used      1920-02-19  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44069  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:22:59  

Additional Information
 Earth MOID = 2.22035 au 
 Jupiter MOID = .561511 au 
 T_jup = 3.027 
[ 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 9.01   n/a E2021B10 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. 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:
[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

[ show close-approach data ]
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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