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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 111 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1886720020869809 1.6882e-08  
a 3.949902182285201 1.8888e-08 au
q 3.204666229505717 7.1307e-08 au
i 2.25816410275847 7.8915e-07 deg
node 265.4685591375561 3.9183e-05 deg
peri 177.6593949815173 3.809e-05 deg
M 13.94130118435939 6.0072e-06 deg
tp 2459285.460180603485
(2021-Mar-11.96018060)
4.7445e-05 TDB
period 2867.331711303417
7.85
2.0567e-05
5.631e-08
d
yr
n .1255522681874686 9.0059e-10 deg/d
Q 4.695138135064684 2.2452e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3483  
   data-arc span      36958 days (101.19 yr)  
   first obs. used      1920-02-19  
   last obs. used      2021-04-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43638  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:30:55  

Additional Information
 Earth MOID = 2.22066 au 
 Jupiter MOID = .559833 au 
 T_jup = 3.027 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456745.5 (2014-Mar-29.0) TDB
Reference: JPL 111 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1884495476693282 1.6748e-08  
q 3.207890355110977 7.0622e-08 au
tp 2456430.940559666261
(2013-May-18.44055967)
4.1424e-05 TDB
node 265.5521790766838 3.9171e-05 deg
peri 178.5702091618725 3.8053e-05 deg
i 2.25809689212483 7.8835e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3483  
   data-arc span      36958 days (101.19 yr)  
   first obs. used      1920-02-19  
   last obs. used      2021-04-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43638  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:30:55  

Additional Information
 Jupiter MOID = .559833 au 
 T_jup = 3.027 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.804902646553362E-16 -1.15517305113019E-15 2.124868976902075E-14 -1.184401595458462E-13 9.418314636958463E-14 3.345985370242408E-15
q -1.15517305113019E-15 4.98741708259206E-15 -2.136032095410183E-14 4.788803445081452E-13 -3.625877069664955E-13 -1.362956103547523E-14
tp 2.124868976902075E-14 -2.136032095410183E-14 1.715933453986722E-9 3.860768807479534E-10 -1.941225183638796E-10 -9.019756163211404E-12
node -1.184401595458462E-13 4.788803445081452E-13 3.860768807479534E-10 1.534330391173776E-9 -1.478770299450555E-9 -2.660180325992574E-11
peri 9.418314636958463E-14 -3.625877069664955E-13 -1.941225183638796E-10 -1.478770299450555E-9 1.447993095665542E-9 2.537657148670906E-11
i 3.345985370242408E-15 -1.362956103547523E-14 -9.019756163211404E-12 -2.660180325992574E-11 2.537657148670906E-11 6.214979060811739E-13

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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