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3530 Hammel (1981 EC20)
Classification: Main-belt Asteroid          SPK-ID: 2003530
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2259914681269795 3.0518e-08  
a 2.400406318732843 7.9211e-09 au
q 1.857934970661129 7.3007e-08 au
i 1.172341213243065 3.5697e-06 deg
node 262.6402131235293 0.00016975 deg
peri 76.06785639662463 0.00016994 deg
M 146.9797073218375 9.8307e-06 deg
tp 2458841.899257959525
(2019-Dec-24.39925796)
3.568e-05 TDB
period 1358.393418877811
3.72
6.7238e-06
1.841e-08
d
yr
n .26501895179778 1.3118e-09 deg/d
Q 2.942877666804556 9.7112e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2038  
   data-arc span      16565 days (45.35 yr)  
   first obs. used      1975-12-01  
   last obs. used      2021-04-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49831  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 14:03:36  

Additional Information
 Earth MOID = .84862 au 
 Jupiter MOID = 2.45439 au 
 T_jup = 3.491 
[ 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 14.23   n/a MPCxxxxx  
diameter diameter 5.305 km 0.619 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.53 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:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.173   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3530 Hammel (1981 EC20)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 EC20 = 1975 XG1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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