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74385 (1998 XH21)
Classification: Main-belt Asteroid          SPK-ID: 2074385
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09921349331243734 4.0182e-08  
a 3.01276221813482 1.9821e-08 au
q 2.713855553953938 1.2387e-07 au
i 1.651157136166135 5.1457e-06 deg
node 129.7316142042814 0.0001357 deg
peri 330.0063309139618 0.00013818 deg
M 43.6429361597169 2.4503e-05 deg
tp 2458768.943396020756
(2019-Oct-12.44339602)
0.00012989 TDB
period 1910.054289827333
5.23
1.8849e-05
5.161e-08
d
yr
n .1884763181430532 1.8599e-09 deg/d
Q 3.311668882315703 2.1787e-08 au
  Orbit Determination Parameters
   # obs. used (total)      896  
   data-arc span      7876 days (21.56 yr)  
   first obs. used      1998-11-15  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55204  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 21:43:55  

Additional Information
 Earth MOID = 1.73089 au 
 Jupiter MOID = 1.81695 au 
 T_jup = 3.241 
[ 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 14.9   n/a MPO417339  
diameter diameter 5.798 km 0.257 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.053   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

74385 (1998 XH21)          Discovered 1998-Dec-10 by Spacewatch at Kitt Peak
Reference: 20040415/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 XH21 = 2000 GW59 = 2002 RY188 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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