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18761 (1999 HA8)
Classification: Main-belt Asteroid          SPK-ID: 2018761
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1870158995714293 2.8378e-08  
a 2.430308012208929 8.3254e-09 au
q 1.975801773070024 6.858e-08 au
i .4038288189283545 3.9679e-06 deg
node 37.47874169352905 0.00052764 deg
peri 213.5903119559075 0.0005278 deg
M 217.8311676213837 1.5098e-05 deg
tp 2459747.002685894077
(2022-Jun-16.50268589)
5.9314e-05 TDB
period 1383.854418934229
3.79
7.1109e-06
1.947e-08
d
yr
n .2601429710194899 1.3367e-09 deg/d
Q 2.884814251347834 9.8824e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1595  
   data-arc span      15416 days (42.21 yr)  
   first obs. used      1978-11-29  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51473  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:37:23  

Additional Information
 Earth MOID = .959999 au 
 Jupiter MOID = 2.15386 au 
 T_jup = 3.484 
[ 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 14.79   n/a E2021B10  
diameter diameter 6.513 km 0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.058   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18761 (1999 HA8)          Discovered 1999-Apr-20 by Spacewatch at Kitt Peak
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 HA8 = 1978 WK11 = 1984 HT1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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