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4797 Ako (1989 SJ)
Classification: Main-belt Asteroid          SPK-ID: 2004797
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1837158038316045 3.0574e-08  
a 2.412171652017463 6.1246e-09 au
q 1.969017597987265 7.4031e-08 au
i 1.810936450590904 3.3739e-06 deg
node 320.5768751912706 0.00010338 deg
peri 78.79278228960153 0.00010379 deg
M 101.5104908471116 8.5086e-06 deg
tp 2458814.649410731947
(2019-Nov-27.14941073)
3.2261e-05 TDB
period 1368.392675252752
3.75
5.2116e-06
1.427e-08
d
yr
n .2630823786991591 1.002e-09 deg/d
Q 2.85532570604766 7.2498e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2169  
   data-arc span      15479 days (42.38 yr)  
   first obs. used      1978-11-05  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47668  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:51:49  

Additional Information
 Earth MOID = .976752 au 
 Jupiter MOID = 2.56347 au 
 T_jup = 3.495 
[ 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 14.31   n/a MPCxxxxx  
diameter diameter 6.000 km 0.496 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.085 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Bennefeld, C.; Bass, S.; Blair, R.; Cunningham, K.; et al. (2009) Minor Planet Bull. 36, 147-148.]
geometric albedo albedo 0.112   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4797 Ako (1989 SJ)          Discovered 1989-Sep-30 by Nomura and Kawanishi at Minami-Oda
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1989 SJ = 1978 VY9 = 1985 QB4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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