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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 98 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3390552143093502 2.377e-08  
a 3.000180773895213 9.1216e-09 au
q 1.98295383863538 7.0421e-08 au
i 18.21762108149753 3.2186e-06 deg
node 129.1028614581093 8.0822e-06 deg
peri 277.4032252601583 9.6441e-06 deg
M 322.5560535029891 7.3415e-06 deg
tp 2459197.923422987589
(2020-Dec-14.42342299)
3.9194e-05 TDB
period 1898.102067879134
5.20
8.6563e-06
2.37e-08
d
yr
n .1896631409301662 8.6496e-10 deg/d
Q 4.017407709155046 1.2214e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2794  
   data-arc span      39132 days (107.14 yr)  
   first obs. used      1913-03-09  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4438  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:12:10  

Additional Information
 Earth MOID = 1.08575 au 
 Jupiter MOID = 1.88437 au 
 T_jup = 3.091 
[ 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 7.8   n/a MPO492758 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-August); 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

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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