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4151 Alanhale (1985 HV1)
Classification: Main-belt Asteroid          SPK-ID: 2004151
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.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1414199868520788 4.9479e-08  
a 3.147257098703064 2.4049e-08 au
q 2.702172041184365 1.5877e-07 au
i 1.007965953738767 4.6251e-06 deg
node 67.05138358277691 0.00031246 deg
peri 74.96460022233994 0.00031285 deg
M 275.9537041585278 1.9101e-05 deg
tp 2458076.616065866498
0.00011033 JED
period 2039.37344288482
n .1765248053297966 2.0233e-09 deg/d
Q 3.592342156221762 2.745e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1556  
   data-arc span      17445 days (47.76 yr)  
   first obs. used      1968-04-17  
   last obs. used      2016-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50642  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 18:05:17  

Additional Information
 Earth MOID = 1.71397 au 
 Jupiter MOID = 1.4309 au 
 T_jup = 3.193 
[ 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 12.3 mag n/a MPO328710  
rotation period rot_per 11.9177 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2016) Astron. J. 150, A75.]

4151 Alanhale (1985 HV1)          Discovered 1985-Apr-24 by Shoemaker, C. and E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1985 HV1 = 1968 HD = 1976 SO1 = 1979 FX1 = 1982 SZ4 = 1985 JX 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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