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4489 (1988 AK)
Classification: Jupiter Trojan          SPK-ID: 2004489
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05753728010677485 7.0529e-08  
a 5.224202066797699 1.2067e-07 au
q 4.923615689145968 3.7951e-07 au
i 22.20694595369729 7.584e-06 deg
node 86.56360657011916 1.6546e-05 deg
peri 8.02076302992959 7.2685e-05 deg
M 107.1100629940011 6.4877e-05 deg
tp 2456102.854243636557
(2012-Jun-24.35424364)
0.00079895 JED
period 4361.424680676393
11.94
0.00015111
4.137e-07
d
yr
n .0825418358352045 2.8598e-09 deg/d
Q 5.52478844444943 1.2761e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1015  
   data-arc span      12998 days (35.59 yr)  
   first obs. used      1980-05-17  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53124  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:52:39  

Additional Information
 Earth MOID = 3.94084 au 
 Jupiter MOID = .185189 au 
 T_jup = 2.848 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.1 mag n/a MPO337289  
diameter diameter 92.93 km 7.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
rotation period rot_per 12.582 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Published Reference List:
[French, L.M.; Stephens, R.D.; Lederer, S.M.; Coley, D.R.; Rohl, D.A. (2011) Minor Planet Bul. 38, 116-120.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2016) Minor Planet Bul. 43, 15-22.]
geometric albedo albedo 0.0514   0.009 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14

4489 (1988 AK)          Discovered 1988-Jan-15 by Bowell, E. at Flagstaff
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 AK = 1980 KA1 = 1989 AQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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