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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2259189606412206 3.3796e-08  
a 2.399686376277024 8.825e-09 au
q 1.857551724283622 8.2191e-08 au
i 1.17270204920397 3.6817e-06 deg
node 262.6471862386525 0.0001992 deg
peri 75.98254632849661 0.00019937 deg
M 42.10868898505795 9.6112e-06 deg
tp 2458841.682127045213
(2019-Dec-24.18212705)
3.5889e-05 TDB
period 1357.782339982406
3.72
7.49e-06
2.051e-08
d
yr
n .2651382253245869 1.4626e-09 deg/d
Q 2.941821028270426 1.0819e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1736  
   data-arc span      16312 days (44.66 yr)  
   first obs. used      1975-12-01  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5186  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:04:36  

Additional Information
 Earth MOID = .84901 au 
 Jupiter MOID = 2.45494 au 
 T_jup = 3.491 
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Orbital Elements at Epoch 2456168.5 (2012-Aug-29.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .224855867008901 3.3826e-08  
q 1.860489724730934 8.2233e-08 au
tp 2456126.564431098335
(2012-Jul-18.06443110)
3.3449e-05 TDB
node 262.754385205643 0.00019932 deg
peri 76.11741537051768 0.0001995 deg
i 1.171656642731093 3.6834e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1736  
   data-arc span      16312 days (44.66 yr)  
   first obs. used      1975-12-01  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5186  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:04:36  

Additional Information
 Jupiter MOID = 2.45494 au 
 T_jup = 3.491 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.144218467339238E-15 -2.77198970304347E-15 3.959463754809382E-13 -7.995838216123928E-15 1.035094438640934E-13 -2.287335940715354E-16
q -2.77198970304347E-15 6.762267879431197E-15 -9.584925634340547E-13 1.920987602540664E-14 -2.50528573731988E-13 5.903776185427693E-16
tp 3.959463754809382E-13 -9.584925634340547E-13 1.1188268877139E-9 -5.089409337932523E-12 3.038473496182091E-10 -2.888084224298969E-13
node -7.995838216123928E-15 1.920987602540664E-14 -5.089409337932523E-12 3.972884348749343E-8 -3.972170229293408E-8 -1.873554610160501E-10
peri 1.035094438640934E-13 -2.50528573731988E-13 3.038473496182091E-10 -3.972170229293408E-8 3.980179198505177E-8 1.872417194043762E-10
i -2.287335940715354E-16 5.903776185427693E-16 -2.888084224298969E-13 -1.873554610160501E-10 1.872417194043762E-10 1.35674542430717E-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)  
rotation period rot_per 4.53 h n/a LCDB (Rev. 2019-August); 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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