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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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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1438142623914137 1.9144e-08  
a 3.168709670798696 1.3674e-08 au
q 2.713004026760242 6.4206e-08 au
i 3.44951964297963 8.4317e-07 deg
node 95.23269817391163 1.6847e-05 deg
peri 188.7688120344998 1.6158e-05 deg
M 301.7410765262926 4.0252e-06 deg
tp 2459729.912636211755
(2022-May-30.41263621)
2.3566e-05 TDB
period 2060.26033231461
5.64
1.3336e-05
3.651e-08
d
yr
n .1747351994082982 1.1311e-09 deg/d
Q 3.62441531483715 1.5641e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3495  
   data-arc span      25925 days (70.98 yr)  
   first obs. used      1950-08-14  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43901  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 08:56:00  

Additional Information
 Earth MOID = 1.69634 au 
 Jupiter MOID = 1.52357 au 
 T_jup = 3.184 
[ 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 11.82   n/a E2021B10  
diameter diameter 21.525 km 0.143 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 16.022 h n/a LCDB (Rev. 2020-October); 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:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
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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