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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0573656991929546 6.9299e-08  
a 5.222898465677056 1.1237e-07 au
q 4.923283243379681 3.6455e-07 au
i 22.20989145918783 7.1471e-06 deg
node 86.55412478060308 1.6079e-05 deg
peri 7.667573366893288 6.7384e-05 deg
M 124.0218549697528 6.0801e-05 deg
tp 2456098.529082607915
(2012-Jun-20.02908261)
0.00074507 JED
period 4359.792315580366
11.94
0.0001407
3.852e-07
d
yr
n .08257274061277793 2.6648e-09 deg/d
Q 5.522513687974429 1.1882e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1080  
   data-arc span      13119 days (35.92 yr)  
   first obs. used      1980-05-17  
   last obs. used      2016-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52489  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:48:21  

Additional Information
 Earth MOID = 3.93919 au 
 Jupiter MOID = .187009 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. 2016-February); 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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