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4477 Kelley (1983 SB)
Classification: Main-belt Asteroid          SPK-ID: 2004477
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .16118637382 2.0834e-08  
a 2.220513503216672 5.1404e-09 au
q 1.862596983614832 4.7156e-08 au
i 2.941419854141496 8.4149e-07 deg
node 224.0548226097739 1.5075e-05 deg
peri 127.2937787234798 1.6897e-05 deg
M 95.78545174205004 5.1897e-06 deg
tp 2458878.929940743818
(2020-Jan-30.42994074)
1.6903e-05 TDB
period 1208.588770286129
3.31
4.1968e-06
1.149e-08
d
yr
n .2978680663355587 1.0343e-09 deg/d
Q 2.578430022818512 5.969e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2622  
   data-arc span      23084 days (63.20 yr)  
   first obs. used      1957-12-22  
   last obs. used      2021-03-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4518  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:23:54  

Additional Information
 Earth MOID = .857036 au 
 Jupiter MOID = 2.85091 au 
 T_jup = 3.631 
[ 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 13.5   n/a MPO492804  
diameter diameter 4.763 km 0.256 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.3773 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2016) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.373   0.063 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4477 Kelley           Discovered 1983 Sept. 28 by the Bulgarian National Observatory at Smolyan.
Michael Shawn Kelley (b. 1958) is a program officer at the Planetary Science Division, NASA Headquarters, Washington, D.C. With expertise in planetary geology, he specializes in constraining the surface composition of asteroids using spectroscopy, including members of the Flora family such as (4477).
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-07-12Last Updated: 2014-08-13

[ show close-approach data ]
Alternate Designations
 1983 SB = 1957 YE = 1973 SE2 = 1976 KR2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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