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17939 (1999 HH8)
Classification: Main-belt Asteroid          SPK-ID: 2017939
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .130380892568125 2.8614e-08  
a 2.234554617667785 5.7987e-09 au
q 1.943211392124034 6.2725e-08 au
i 9.559025510573232 3.6543e-06 deg
node 320.912362002718 2.1955e-05 deg
peri 329.4911918750099 2.8244e-05 deg
M 91.25670119968447 1.8842e-05 deg
tp 2458891.223335351695
(2020-Feb-11.72333535)
6.3728e-05 TDB
period 1220.07039274585
3.34
4.7491e-06
1.3e-08
d
yr
n .2950649422692702 1.1485e-09 deg/d
Q 2.525897843211536 6.5547e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2571  
   data-arc span      24572 days (67.27 yr)  
   first obs. used      1953-11-30  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43512  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:18:07  

Additional Information
 Earth MOID = .931603 au 
 Jupiter MOID = 2.67572 au 
 T_jup = 3.610 
[ 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 13.55   n/a E2021B10  
diameter diameter 5.109 km 0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.10 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Clark, M. (2006) Minor Planet Bull. 33, 53-56.]
geometric albedo albedo 0.563   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

17939 (1999 HH8)          Discovered 1999-Apr-16 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 HH8 = 1983 OG = 1987 YW2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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