Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 103 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .188142915076142 3.2817e-08  
a 3.947165236569648 2.2095e-08 au
q 3.204534062674225 1.3646e-07 au
i 2.258713548106713 3.6314e-06 deg
node 265.4648292940176 0.00010679 deg
peri 177.7270580006386 0.00010733 deg
M 324.1400935274544 1.1075e-05 deg
tp 2459285.820541449632
(2021-Mar-12.32054145)
8.916e-05 TDB
period 2864.352002716642
7.84
2.4051e-05
6.585e-08
d
yr
n .1256828768456407 1.0553e-09 deg/d
Q 4.689796410465071 2.6252e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3089  
   data-arc span      36777 days (100.69 yr)  
   first obs. used      1920-02-19  
   last obs. used      2020-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45192  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:26:12  

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

[ 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Dec-02 01:14 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin