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4151 Alanhale (1985 HV1)
Classification: Main-belt Asteroid          SPK-ID: 2004151
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1480192495296068 2.1644e-08  
a 3.139868426179938 1.3937e-08 au
q 2.675107458115076 7.0565e-08 au
i 1.002050187581972 9.4819e-07 deg
node 66.87423816144634 0.00012798 deg
peri 76.21960033665388 0.00012714 deg
M 231.6010501093407 1.1031e-05 deg
tp 2460121.310660792031
(2023-Jun-25.81066079)
6.5196e-05 TDB
period 2032.196042937523
5.56
1.3531e-05
3.705e-08
d
yr
n .1771482634517992 1.1795e-09 deg/d
Q 3.6046293942448 1.6e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2695  
   data-arc span      19420 days (53.17 yr)  
   first obs. used      1968-04-17  
   last obs. used      2021-06-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46461  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:33:32  

Additional Information
 Earth MOID = 1.6886 au 
 Jupiter MOID = 1.4103 au 
 T_jup = 3.193 
[ 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 12.41   n/a E2021B10  
diameter diameter 19.526 km 0.269 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.918 h n/a LCDB (Rev. 2020-October); 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. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.045   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

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

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