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66266 (1999 HQ9)
Classification: Main-belt Asteroid          SPK-ID: 2066266
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1119361024610749 3.1696e-08  
a 2.293822451198675 9.1873e-09 au
q 2.037060906273786 7.2786e-08 au
i 5.551346986190879 3.8041e-06 deg
node 220.368670848354 4.408e-05 deg
peri 23.97341056687804 4.8812e-05 deg
M 357.4412349378098 2.2683e-05 deg
tp 2459009.519158870531
(2020-Jun-09.01915887)
7.9974e-05 TDB
period 1268.931345581118
3.47
7.6236e-06
2.087e-08
d
yr
n .2837032919500738 1.7045e-09 deg/d
Q 2.550583996123563 1.0216e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1095  
   data-arc span      7229 days (19.79 yr)  
   first obs. used      1999-03-25  
   last obs. used      2019-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56549  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 07:26:00  

Additional Information
 Earth MOID = 1.02559 au 
 Jupiter MOID = 2.45662 au 
 T_jup = 3.582 
[ 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 15.4   n/a MPO366011  
diameter diameter 1.994 km 0.402 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.280   0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

66266 (1999 HQ9)          Discovered 1999-Apr-17 by LINEAR at Socorro
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 HQ9 = 2000 SJ140 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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