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JPL Small-Body Database Browser
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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1305233497609857 4.2967e-08  
a 2.234840641625571 8.4227e-09 au
q 1.943141754898611 9.887e-08 au
i 9.558771734520843 4.6579e-06 deg
node 320.9116491011874 2.4779e-05 deg
peri 329.5174044886483 3.1262e-05 deg
M 32.21131514312086 2.1885e-05 deg
tp 2458891.312172782513
(2020-Feb-11.81217278)
7.3949e-05 TDB
period 1220.304654549009
3.34
6.8986e-06
1.889e-08
d
yr
n .2950082986719787 1.6677e-09 deg/d
Q 2.526539528352531 9.522e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1740  
   data-arc span      23903 days (65.44 yr)  
   first obs. used      1953-11-30  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47632  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:33:48  

Additional Information
 Earth MOID = .93348 au 
 Jupiter MOID = 2.67599 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 13.5   n/a MPO435866  
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. 2019-August); 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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