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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0581606833138081 7.0384e-08  
a 5.227589631124157 1.2246e-07 AU
q 4.923549446093799 3.8134e-07 AU
i 22.20452069532575 7.6047e-06 deg
node 86.58706793290604 1.6568e-05 deg
peri 8.631580284278332 7.2144e-05 deg
M 73.39911750786328 6.459e-05 deg
tp 2456110.399599901706
(2012-Jul-01.89959990)
0.00079248 JED
period 4365.66753000889
11.95
0.0001534
4.2e-07
d
yr
n .08246161612752653 2.8975e-09 deg/d
Q 5.531629816154517 1.2958e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      1012  
   data-arc span      12810 days (35.07 yr)  
   first obs. used      1980-05-17  
   last obs. used      2015-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5308  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:48:48  

Additional Information
 Earth MOID = 3.94111 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 12.58 h n/a LCDB (Rev. 2015-July); 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.]
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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