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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1106615480155661 3.7886e-08  
a 2.795743223622176 1.3184e-08 au
q 2.486361950642117 1.0802e-07 au
i 2.661212995657144 3.5344e-06 deg
node 265.4668169188853 8.6246e-05 deg
peri 101.8051784607531 8.7636e-05 deg
M 275.3703085244977 1.5717e-05 deg
tp 2459001.888203829574
(2020-Jun-01.38820383)
7.5242e-05 TDB
period 1707.435663055384
4.67
1.2078e-05
3.307e-08
d
yr
n .210842497781612 1.4914e-09 deg/d
Q 3.105124496602235 1.4643e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1993  
   data-arc span      15044 days (41.19 yr)  
   first obs. used      1978-09-09  
   last obs. used      2019-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50542  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:42:01  

Additional Information
 Earth MOID = 1.48592 au 
 Jupiter MOID = 2.3649 au 
 T_jup = 3.317 
[ 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

[ show close-approach data ]
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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