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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2262882618954534 3.3957e-08  
a 2.40058240295279 8.987e-09 au
q 1.857358783451792 8.2567e-08 au
i 1.17250066975043 3.7051e-06 deg
node 262.6474859309347 0.00019999 deg
peri 75.9468014337284 0.00020017 deg
M 296.1201718896169 9.5492e-06 deg
tp 2458841.565239898768
(2019-Dec-24.06523990)
3.6591e-05 TDB
period 1358.54289109226
3.72
7.6289e-06
2.089e-08
d
yr
n .2649897933738125 1.4881e-09 deg/d
Q 2.943806022453788 1.1021e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1713  
   data-arc span      16032 days (43.89 yr)  
   first obs. used      1975-12-01  
   last obs. used      2019-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52131  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:27:03  

Additional Information
 Earth MOID = .847892 au 
 Jupiter MOID = 2.44955 au 
 T_jup = 3.490 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456111.5 (2012-Jul-03.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2248461964270643 3.4009e-08  
q 1.860483527413743 8.2571e-08 au
tp 2456126.541959118224
(2012-Jul-18.04195912)
3.3821e-05 TDB
node 262.7535407331167 0.00020011 deg
peri 76.10860226192793 0.00020029 deg
i 1.171654939441643 3.7064e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1713  
   data-arc span      16032 days (43.89 yr)  
   first obs. used      1975-12-01  
   last obs. used      2019-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52131  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:27:03  

Additional Information
 Jupiter MOID = 2.44955 au 
 T_jup = 3.490 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.156584131665525E-15 -2.798177144128426E-15 4.130693866926555E-13 -8.28657618865843E-15 1.076760268950463E-13 -2.297658101565921E-16
q -2.798177144128426E-15 6.817921453458052E-15 -9.935767965026707E-13 1.980073965172886E-14 -2.591088751723863E-13 5.934202666984427E-16
tp 4.130693866926555E-13 -9.935767965026707E-13 1.143877535927366E-9 -5.214391084743573E-12 3.095794467295003E-10 -2.970575253205596E-13
node -8.28657618865843E-15 1.980073965172886E-14 -5.214391084743573E-12 4.004260443086924E-8 -4.003542047299051E-8 -1.942158514399676E-10
peri 1.076760268950463E-13 -2.591088751723863E-13 3.095794467295003E-10 -4.003542047299051E-8 4.011672678897927E-8 1.940987087368545E-10
i -2.297658101565921E-16 5.934202666984427E-16 -2.970575253205596E-13 -1.942158514399676E-10 1.940987087368545E-10 1.373774217746974E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2   n/a MPO439098  
diameter diameter 5.305 km 0.619 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
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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