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JPL Small-Body Database Browser
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39818 (1997 YR4)
Classification: Main-belt Asteroid          SPK-ID: 2039818
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1436650154508335 4.2692e-08  
a 2.272824615236325 7.7059e-09 au
q 1.946299231771364 9.9042e-08 au
i 4.072941575777375 3.2986e-06 deg
node 109.2949548309387 7.2227e-05 deg
peri 292.6252476388654 7.3602e-05 deg
M 256.0288056291489 1.4161e-05 deg
tp 2459361.958003495891
(2021-May-27.45800350)
4.9763e-05 TDB
period 1251.547431439357
3.43
6.365e-06
1.743e-08
d
yr
n .2876439126130263 1.4629e-09 deg/d
Q 2.599349998701286 8.813e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1247  
   data-arc span      7798 days (21.35 yr)  
   first obs. used      1997-12-24  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5215  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 08:46:27  

Additional Information
 Earth MOID = .959226 au 
 Jupiter MOID = 2.78222 au 
 T_jup = 3.594 
[ 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 15.4   n/a MPO468238  
diameter diameter 2.034 km 0.352 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.355   0.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39818 (1997 YR4)          Discovered 1997-Dec-24 by Sato, N. at Chichibu
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1997 YR4 = 2000 RL66 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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