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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456633.5 (2013-Dec-07.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2258967535520018 3.0475e-08  
q 1.858442281025521 7.295e-08 au
tp 2456127.087134717084
(2012-Jul-18.58713472)
3.1699e-05 TDB
node 262.7392498978212 0.0001698 deg
peri 76.1802252744581 0.00016999 deg
i 1.17192728019351 3.57e-06 deg
  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
 Jupiter MOID = 2.45439 au 
 T_jup = 3.491 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.287018704054885E-16 -2.215328600863204E-15 2.443237813014046E-13 -6.008098426502528E-15 5.131259936418925E-14 -1.440319209791736E-16
q -2.215328600863204E-15 5.321722913013481E-15 -5.692868056022112E-13 1.344859406062795E-14 -1.156608391619317E-13 3.690262800672936E-16
tp 2.443237813014046E-13 -5.692868056022112E-13 1.004842292889225E-9 -4.795929052289392E-12 2.666449223656159E-10 -2.314997630226892E-13
node -6.008098426502528E-15 1.344859406062795E-14 -4.795929052289392E-12 2.883167248126155E-8 -2.88267484268909E-8 -9.670266458761714E-11
peri 5.131259936418925E-14 -1.156608391619317E-13 2.666449223656159E-10 -2.88267484268909E-8 2.889696846042844E-8 9.662816858310499E-11
i -1.440319209791736E-16 3.690262800672936E-16 -2.314997630226892E-13 -9.670266458761714E-11 9.662816858310499E-11 1.274487783161955E-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 14.23   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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