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4261 Gekko (1989 BJ)
Classification: Main-belt Asteroid          SPK-ID: 2004261
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1101621665374291 3.7694e-08  
a 2.793137384623907 1.2653e-08 au
q 2.485439318897049 1.074e-07 au
i 2.661615810166941 3.507e-06 deg
node 265.4671404144996 8.6123e-05 deg
peri 102.2055584722439 8.752e-05 deg
M 359.3740068120443 1.5771e-05 deg
tp 2459003.464858559038
(2020-Jun-02.96485856)
7.4698e-05 TDB
period 1705.049035340664
4.67
1.1586e-05
3.172e-08
d
yr
n .2111376227535139 1.4347e-09 deg/d
Q 3.100835450350765 1.4047e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2039  
   data-arc span      15305 days (41.90 yr)  
   first obs. used      1978-09-09  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50351  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:13:55  

Additional Information
 Earth MOID = 1.48596 au 
 Jupiter MOID = 2.37354 au 
 T_jup = 3.318 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.0   n/a MPO448956  
diameter diameter 6.688 km 0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.288   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4261 Gekko (1989 BJ)          Discovered 1989-Jan-28 by Oshima, Y. at Gekko
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1989 BJ = 1978 RR16 = 1978 VN = 1980 BV2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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