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2688 Halley (1982 HG1)
Classification: Main-belt Asteroid          SPK-ID: 2002688
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1438032322625628 3.0055e-08  
a 3.170234354627036 1.6122e-08 au
q 2.714344407401849 9.5437e-08 au
i 3.449579400744214 3.3961e-06 deg
node 95.23862968071612 6.3826e-05 deg
peri 188.5687090864175 6.534e-05 deg
M 232.7772464123724 1.5372e-05 deg
tp 2459729.114431830765
(2022-May-29.61443183)
8.9261e-05 TDB
period 2061.747510270712
5.64
1.5727e-05
4.306e-08
d
yr
n .1746091595632538 1.3319e-09 deg/d
Q 3.626124301852224 1.844e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2846  
   data-arc span      25502 days (69.82 yr)  
   first obs. used      1950-08-14  
   last obs. used      2020-06-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46876  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:48:24  

Additional Information
 Earth MOID = 1.69795 au 
 Jupiter MOID = 1.52304 au 
 T_jup = 3.183 
[ 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 11.8   n/a MPO502179  
diameter diameter 21.525 km 0.143 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.077   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

2688 Halley (1982 HG1)          Discovered 1982-Apr-25 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1982 HG1 = 1955 QN1 = 1978 SH6 = 1978 TE9 = 1978 UO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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