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18762 (1999 HC9)
Classification: Main-belt Asteroid          SPK-ID: 2018762
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1880536285892401 4.6649e-08  
a 2.124147145211448 7.2461e-09 au
q 1.72469356689696 1.0194e-07 au
i 1.979281145875419 4.5756e-06 deg
node 303.7849007624388 9.1483e-05 deg
peri 45.46873798972045 9.2053e-05 deg
M 227.940485095621 1.3943e-05 deg
tp 2459615.303603913204
(2022-Feb-04.80360391)
4.5508e-05 TDB
period 1130.772724077314
3.10
5.7861e-06
1.584e-08
d
yr
n .3183663634031783 1.6291e-09 deg/d
Q 2.523600723525937 8.6087e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1713  
   data-arc span      17973 days (49.21 yr)  
   first obs. used      1971-03-25  
   last obs. used      2020-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52337  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:37:23  

Additional Information
 Earth MOID = .717228 au 
 Jupiter MOID = 2.89674 au 
 T_jup = 3.704 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.00   n/a E2021B10  
diameter diameter 2.028 km 0.218 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.471   0.143 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

18762 (1999 HC9)          Discovered 1999-Apr-17 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 HC9 = 1978 QZ = 1989 AE10 = 1989 AW4 = 3171 T-1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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