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74028 (1998 HR18)
Classification: Main-belt Asteroid          SPK-ID: 2074028
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2143524323595737 3.39e-08  
a 2.389847396250006 9.4011e-09 au
q 1.877577793895623 8.1767e-08 au
i 4.387262693216934 4.9384e-06 deg
node 349.8562148515915 5.1043e-05 deg
peri 277.0196894830038 5.2335e-05 deg
M 307.5339605682235 1.1578e-05 deg
tp 2459197.166080428995
(2020-Dec-13.66608043)
4.3767e-05 TDB
period 1349.44031837017
3.69
7.9625e-06
2.18e-08
d
yr
n .2667772669152214 1.5742e-09 deg/d
Q 2.902116998604389 1.1416e-08 au
  Orbit Determination Parameters
   # obs. used (total)      792  
   data-arc span      9560 days (26.17 yr)  
   first obs. used      1994-02-15  
   last obs. used      2020-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54253  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 14:02:49  

Additional Information
 Earth MOID = .867978 au 
 Jupiter MOID = 2.21589 au 
 T_jup = 3.497 
[ 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 15.9   n/a MPO426448  
diameter diameter 3.908 km 0.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.055   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

74028 (1998 HR18)          Discovered 1998-Apr-18 by LINEAR at Socorro
Reference: 20040415/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HR18 = 1994 CW7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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