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3581 Alvarez (1985 HC)
Classification: Mars-crossing Asteroid          SPK-ID: 2003581
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4057428547855922 1.9848e-08  
a 2.775199753860564 1.0474e-08 au
q 1.649182283128906 5.3527e-08 au
i 28.85875267143743 6.5565e-07 deg
node 217.4312227150868 3.6948e-06 deg
peri 107.63228643 4.56e-06 deg
M 207.0572413214332 7.6076e-06 deg
tp 2459917.908004485009
(2022-Dec-04.40800449)
3.9037e-05 TDB
period 1688.650602657113
4.62
9.5595e-06
2.617e-08
d
yr
n .2131879735414393 1.2069e-09 deg/d
Q 3.901217224592223 1.4723e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1918  
   data-arc span      21507 days (58.88 yr)  
   first obs. used      1962-05-05  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42031  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:04:26  

Additional Information
 Earth MOID = .832184 au 
 Jupiter MOID = 2.42227 au 
 T_jup = 3.044 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.30   n/a MPCxxxxx  
rotation period rot_per 33.42 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:
[Koff, R.A. (2005) Minor Planet Bull. 32, 32-34.]
SMASSII spectral type spec_B B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

3581 Alvarez (1985 HC)          Discovered 1985-Apr-23 by Shoemaker, C. and Shoemaker, E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1985 HC = 1962 JL = 1971 KE = 1981 TG4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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