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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4056171373882237 3.8539e-08  
a 2.775462087470988 1.1289e-08 au
q 1.649687100621462 1.0421e-07 au
i 28.85626118055771 6.0458e-06 deg
node 217.4457318498607 8.9462e-06 deg
peri 107.6064422331946 1.1698e-05 deg
M 164.4500589694917 1.0113e-05 deg
tp 2458229.005368060219
(2018-Apr-20.50536806)
4.4158e-05 TDB
period 1688.890045030913
4.62
1.0304e-05
2.821e-08
d
yr
n .2131577488180473 1.3005e-09 deg/d
Q 3.901237074320514 1.5868e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1760  
   data-arc span      21171 days (57.96 yr)  
   first obs. used      1962-05-05  
   last obs. used      2020-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41801  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:56:00  

Additional Information
 Earth MOID = .83393 au 
 Jupiter MOID = 2.42152 au 
 T_jup = 3.044 
[ 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 12.2   n/a MPO416748  
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

[ show close-approach data ]
Alternate Designations
 1985 HC = 1962 JL = 1971 KE = 1981 TG4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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