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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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1480192498694128 2.1614e-08  
a 3.139868426356177 1.3897e-08 au
q 2.675107457198282 7.0512e-08 au
i 1.00205016031749 9.463e-07 deg
node 66.87423449561614 0.00012774 deg
peri 76.21960401523052 0.00012689 deg
M 231.6010500302763 1.1015e-05 deg
tp 2460121.310661299373
(2023-Jun-25.81066130)
6.5092e-05 TDB
period 2032.196043108622
5.56
1.3492e-05
3.694e-08
d
yr
n .1771482634368843 1.1761e-09 deg/d
Q 3.604629395514072 1.5954e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2734  
   data-arc span      19472 days (53.31 yr)  
   first obs. used      1968-04-17  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46183  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:31:16  

Additional Information
 Earth MOID = 1.6886 au 
 Jupiter MOID = 1.4103 au 
 T_jup = 3.193 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457066.5 (2015-Feb-13.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1414239739627824 2.1231e-08  
q 2.702937738011964 6.8802e-08 au
tp 2458075.765721514561
(2017-Nov-18.26572151)
5.9975e-05 TDB
node 67.04822183294426 0.00012645 deg
peri 74.80120697730926 0.00012559 deg
i 1.008017062292478 9.4009e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2734  
   data-arc span      19472 days (53.31 yr)  
   first obs. used      1968-04-17  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46183  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:31:16  

Additional Information
 Jupiter MOID = 1.4103 au 
 T_jup = 3.193 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.507709848840701E-16 -1.438900465755348E-15 -7.654151964144941E-14 -5.240675568766182E-13 5.174329789254062E-13 -7.155808519106191E-15
q -1.438900465755348E-15 4.733780629984082E-15 5.584372484666848E-13 1.616382947275109E-12 -1.562488622413156E-12 2.209930951360119E-14
tp -7.654151964144941E-14 5.584372484666848E-13 3.59698446393637E-9 5.368913218432597E-10 -5.006073816661647E-11 3.688020343507295E-12
node -5.240675568766182E-13 1.616382947275109E-12 5.368913218432597E-10 1.598853630206666E-8 -1.584706733858141E-8 8.116309476719401E-11
peri 5.174329789254062E-13 -1.562488622413156E-12 -5.006073816661647E-11 -1.584706733858141E-8 1.577357160921803E-8 -8.021544104668175E-11
i -7.155808519106191E-15 2.209930951360119E-14 3.688020343507295E-12 8.116309476719401E-11 -8.021544104668175E-11 8.837624595435407E-13

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

[ show close-approach data ]
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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