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2340 Hathor (1976 UA)
Classification: Aten [NEO, PHA]          SPK-ID: 2002340
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2453228.5 (2004-Aug-11.0) TDB
Reference: JPL 60 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4498841655895494 1.0082e-07  
a .8438292455376517 5.9662e-10 au
q .4642038295088863 8.4879e-08 au
i 5.854591233229053 8.1522e-06 deg
node 211.5421370750162 2.6559e-05 deg
peri 39.92629416655726 2.8328e-05 deg
M 42.10443294792183 1.2119e-05 deg
tp 2453195.386460219392
9.5386e-06 JED
period 283.1263476642372
n 1.271517126434761 1.3485e-09 deg/d
Q 1.223454661566417 8.6503e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.028587184797805E-14 1.247E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      189  
   # delay obs. used      4  
   # Doppler obs. used      3  
   data-arc span      13878 days (38.00 yr)  
   first obs. used      1976-10-25  
   last obs. used      2014-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4662  
   data source      ORB  
   producer      Giorgini  
   solution date      2014-Oct-24 19:08:05  

Additional Information
 Earth MOID = .00687373 au 
 Jupiter MOID = 3.81114 au 
 T_jup = 6.882 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 20.2 mag n/a MPO319112  
diameter diameter 0.3 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 3.350 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2015) Minor Planet Bul. 42, 115-127.]
B-V BV .770 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=32.11 deg.
U-B UB .500 mag .042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=32.11 deg.
Tholen spectral type spec_T CSU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2340 Hathor           Discovered 1976 Oct. 22 by C. Kowal at Palomar.
Like the other objects of Aten type, (2340) is named for an Egyptian deity. Known as a sky-goddess and the daughter of Ra, Hathor was also identified with Aphrodite. Name proposed by E. Helin, who made an independent discovery of the object and who also made crucial recovery observations in 1981.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 6060Last Updated: 2006-03-21

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Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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