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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1101621603288604 3.5667e-08  
a 2.793137388171926 1.0652e-08 au
q 2.485439339395596 9.9622e-08 au
i 2.661616233494394 3.3448e-06 deg
node 265.4671470805662 8.1646e-05 deg
peri 102.2055535730999 8.3084e-05 deg
M 359.3740037607625 1.4646e-05 deg
tp 2459003.464873016312
6.9366e-05 TDB
period 1705.049038589455
n .2111376223512134 1.2078e-09 deg/d
Q 3.100835436948257 1.1826e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2277  
   data-arc span      15392 days (42.14 yr)  
   first obs. used      1978-09-09  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48021  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:53:04  

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] (  
geometric albedo albedo 0.288   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2047-Mar-28 13:40 < 00:01 Ceres 0.0472938299749337 0.0472897023029638 0.0472979579492514 5.0324273434445 5.03242556839797 2468798.069529619 0.49967432696025 279.291354606982 33.6432384690203 43.2704030897702 144548.440042615 T 32 CATAB v2.0f-lin.ifort 2020-Nov-13 03:53:10 2020-Nov-13 03:53

Alternate Designations
 1989 BJ = 1978 RR16 = 1978 VN = 1980 BV2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Nov-28 12:03 UT
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