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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456701.5 (2014-Feb-13.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1436154334432457 4.2555e-08  
q 1.945461847376106 9.863e-08 au
tp 2456860.968918858537
(2014-Jul-22.46891886)
4.7595e-05 TDB
node 109.3331606409211 7.2222e-05 deg
peri 292.7922026479453 7.36e-05 deg
i 4.073352060514854 3.2985e-06 deg
  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
 Jupiter MOID = 2.78222 au 
 T_jup = 3.594 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.810907882633436E-15 -4.188449532056188E-15 -8.791963749082034E-13 7.909766816345361E-15 -2.797308686273783E-13 -2.611255718665609E-15
q -4.188449532056188E-15 9.727847514112333E-15 2.00752852947368E-12 -1.728295089334508E-14 6.365069881483219E-13 6.124414509762115E-15
tp -8.791963749082034E-13 2.00752852947368E-12 2.265274480269033E-9 -2.590328002250646E-12 7.062033860743748E-10 2.090823507099785E-12
node 7.909766816345361E-15 -1.728295089334508E-14 -2.590328002250646E-12 5.21597429837277E-9 -5.20329064237189E-9 4.825501209742357E-11
peri -2.797308686273783E-13 6.365069881483219E-13 7.062033860743748E-10 -5.20329064237189E-9 5.416927026242235E-9 -4.747395123719191E-11
i -2.611255718665609E-15 6.124414509762115E-15 2.090823507099785E-12 4.825501209742357E-11 -4.747395123719191E-11 1.088006270943892E-11

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

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