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JPL Small-Body Database Browser
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747 Winchester (A913 EK)
Classification: Main-belt Asteroid          SPK-ID: 2000747
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3392297216891925 2.3881e-08  
a 3.005864082446925 9.6058e-09 au
q 1.986185646322915 7.0716e-08 au
i 18.18137323106299 3.2289e-06 deg
node 129.1696683031124 8.1211e-06 deg
peri 277.0381931662376 9.6449e-06 deg
M 247.1666126144911 7.109e-06 deg
tp 2459197.105923414772
(2020-Dec-13.60592341)
3.9164e-05 TDB
period 1903.498046154571
5.21
9.1244e-06
2.498e-08
d
yr
n .1891254896359199 9.0658e-10 deg/d
Q 4.025542518570935 1.2864e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2718  
   data-arc span      38950 days (106.64 yr)  
   first obs. used      1913-03-09  
   last obs. used      2019-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45261  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:57:01  

Additional Information
 Earth MOID = 1.08825 au 
 Jupiter MOID = 1.88112 au 
 T_jup = 3.090 
[ 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 7.69   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24
diameter diameter 171.71 km 3.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24
rotation period rot_per 9.4146 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Zappala, V.; Scaltriti, F.; Di Martino, M. (1983) Icarus 56, 325-344.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2007) Minor Planet Bull. 34, 104-107.]
[Marciniak, A.; Michalowski, T.; Hirsch, R.; Polinska, K.; et al. (2009) Astron. Astrophys. 498, 313-320.]
[Pilcher, F. (2010) Minor Planet Bull. 37, 119-122.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0503   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24
B-V BV 0.713   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=9.31, mean=9.48, max.=9.77) deg.
U-B UB 0.317   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=9.31, mean=9.48, max.=9.77) deg.
Tholen spectral type spec_T PC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

747 Winchester (A913 EK)          Discovered 1913-Mar-07 by Metcalf, J. H. at Winchester
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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