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4159 Freeman (1989 GK)
Classification: Main-belt Asteroid          SPK-ID: 2004159
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07377557943513495 4.1405e-08  
a 2.550086215170534 9.12e-09 au
q 2.361952127036778 1.0503e-07 au
i 15.20005106428754 3.1912e-06 deg
node 91.2300174643923 1.6683e-05 deg
peri 313.5127800945037 3.461e-05 deg
M 81.56376852753479 2.9978e-05 deg
tp 2458863.503411040600
(2020-Jan-15.00341104)
0.00012361 TDB
period 1487.410086801328
4.07
7.9793e-06
2.185e-08
d
yr
n .242031436518075 1.2984e-09 deg/d
Q 2.73822030330429 9.7928e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2672  
   data-arc span      30068 days (82.32 yr)  
   first obs. used      1938-11-25  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38633  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:26:52  

Additional Information
 Earth MOID = 1.39562 au 
 Jupiter MOID = 2.55998 au 
 T_jup = 3.388 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.27   n/a E2021B10  
diameter diameter 17.31 km 1.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
rotation period rot_per 4.4021 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Ditteon, R.; Hirsch, B.; Kirkpatrick, E.; Kramb, S.; et al. (2004) Minor Planet Bull. 31, 54-56.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.2822   0.036 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5

4159 Freeman (1989 GK)          Discovered 1989-Apr-05 by Helin, E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1989 GK = 1937 NT = 1938 WH = 1940 GM = 1957 LO = 1977 LN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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