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2340 Hathor (1976 UA)
Classification: Aten [NEO, PHA]          SPK-ID: 2002340
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.

Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 61 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4498676986832429 4.029e-08  
a .8438463336688155 2.2943e-09 au
q .4642271254989335 3.4703e-08 au
i 5.858409597667089 5.061e-06 deg
node 211.3493682384925 1.4997e-05 deg
peri 40.05908067115011 1.5978e-05 deg
M 73.12964400835013 8.8528e-06 deg
tp 2459142.984561246808
6.761e-06 TDB
period 283.1349479669951
n 1.271478503748555 5.1854e-09 deg/d
Q 1.223465541838697 3.3264e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.068053568809521E-14 1.275E-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)      454  
   # delay obs. used      4  
   # Doppler obs. used      3  
   data-arc span      15431 days (42.25 yr)  
   first obs. used      1976-10-25  
   last obs. used      2019-01-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36814  
   source      ORB  
   producer      Giorgini  
   solution date      2021-May-24 18:47:10  

Additional Information
 Earth MOID = .00667288 au 
 Jupiter MOID = 3.81609 au 
 T_jup = 6.882 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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 20.2   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. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2014)]
[Warner, B.D. (2015) Minor Planet Bull. 42, 115-127.]
B-V BV 0.770   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=32.11 deg.
U-B UB 0.500   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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