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136887 (1998 HQ9)
Classification: Main-belt Asteroid          SPK-ID: 2136887
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08402464982805971 5.3025e-08  
a 3.115691631077863 3.1772e-08 au
q 2.853896732804329 1.6491e-07 au
i 14.2288681973393 6.0433e-06 deg
node 86.16489525290351 2.5321e-05 deg
peri 192.1485262524306 4.9377e-05 deg
M 241.0867679175954 4.5369e-05 deg
tp 2459264.025795308348
(2021-Feb-18.52579531)
0.00025592 TDB
period 2008.769605601784
5.50
3.0726e-05
8.412e-08
d
yr
n .1792141811565054 2.7413e-09 deg/d
Q 3.377486529351396 3.4442e-08 au
  Orbit Determination Parameters
   # obs. used (total)      484  
   data-arc span      7656 days (20.96 yr)  
   first obs. used      1998-04-18  
   last obs. used      2019-04-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56665  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 07:45:49  

Additional Information
 Earth MOID = 1.83854 au 
 Jupiter MOID = 1.73344 au 
 T_jup = 3.165 
[ 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 14.5   n/a MPO436675  
diameter diameter 7.655 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.052   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

136887 (1998 HQ9)          Discovered 1998-Apr-18 by Spacewatch at Kitt Peak
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

[ show close-approach data ]
Alternate Designations
 1998 HQ9 = 2001 YX78 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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