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3130 Hillary (1981 YO)
Classification: Main-belt Asteroid          SPK-ID: 2003130
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1991618532731441 4.8394e-08  
a 2.465415780331797 9.4359e-09 au
q 1.974399004432062 1.2235e-07 au
i 4.218179313077204 4.074e-06 deg
node 109.7395901225172 6.8285e-05 deg
peri 244.3212911239881 6.9018e-05 deg
M 38.83737161519515 1.3359e-05 deg
tp 2458847.960958233976
(2019-Dec-30.46095823)
5.2028e-05 TDB
period 1413.948801166643
3.87
8.1174e-06
2.222e-08
d
yr
n .2546061071680711 1.4617e-09 deg/d
Q 2.956432556231532 1.1315e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1935  
   data-arc span      23312 days (63.82 yr)  
   first obs. used      1956-03-10  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51433  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:39:07  

Additional Information
 Earth MOID = .973659 au 
 Jupiter MOID = 2.48645 au 
 T_jup = 3.456 
[ 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 13.2   n/a MPO452206  
diameter diameter 13.106 km 0.102 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 25.282 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.055   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3130 Hillary (1981 YO)          Discovered 1981-Dec-20 by Mrkos, A. at Klet
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 YO = 1969 TB = 1980 KO1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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