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JPL Small-Body Database Browser
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56216 (1999 HJ2)
Classification: Main-belt Asteroid          SPK-ID: 2056216
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .159823234430554 4.1788e-08  
a 2.599539259106102 1.4011e-08 au
q 2.184072486686559 1.0905e-07 au
i 9.791598878437405 5.3716e-06 deg
node 54.99422829111815 2.4846e-05 deg
peri 216.1342892274651 2.977e-05 deg
M 318.3950729104574 1.7906e-05 deg
tp 2459177.423394141699
(2020-Nov-23.92339414)
7.655e-05 TDB
period 1530.886516251599
4.19
1.2377e-05
3.389e-08
d
yr
n .2351578619174634 1.9012e-09 deg/d
Q 3.015006031525645 1.6251e-08 au
  Orbit Determination Parameters
   # obs. used (total)      994  
   data-arc span      9018 days (24.69 yr)  
   first obs. used      1995-05-27  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55199  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 11:44:32  

Additional Information
 Earth MOID = 1.17666 au 
 Jupiter MOID = 2.09171 au 
 T_jup = 3.377 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456999.5 (2014-Dec-08.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1601977100340178 4.2052e-08  
q 2.184316566024271 1.1004e-07 au
tp 2457643.404966559424
(2016-Sep-11.90496656)
7.3299e-05 TDB
node 55.12296690383077 2.4845e-05 deg
peri 215.500597190038 2.968e-05 deg
i 9.791168127972307 5.3698e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      994  
   data-arc span      9018 days (24.69 yr)  
   first obs. used      1995-05-27  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55199  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 11:44:32  

Additional Information
 Jupiter MOID = 2.09171 au 
 T_jup = 3.377 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.768348082601437E-15 -4.600704150121761E-15 -9.27320470244453E-13 -7.935489947426968E-15 -2.115374430918895E-13 2.06910855206116E-15
q -4.600704150121761E-15 1.210968478220982E-14 2.558750404549342E-12 2.157756447262718E-14 5.675640959764767E-13 -5.619672091820458E-15
tp -9.27320470244453E-13 2.558750404549342E-12 5.372742122282922E-9 -1.133803090430084E-11 1.204371826012087E-9 -3.356876790592272E-14
node -7.935489947426968E-15 2.157756447262718E-14 -1.133803090430084E-11 6.172851625881944E-10 -6.101446461929434E-10 -2.08412120259675E-11
peri -2.115374430918895E-13 5.675640959764767E-13 1.204371826012087E-9 -6.101446461929434E-10 8.808857311029135E-10 2.049177107525353E-11
i 2.06910855206116E-15 -5.619672091820458E-15 -3.356876790592272E-14 -2.08412120259675E-11 2.049177107525353E-11 2.883488980057921E-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 14.8   n/a MPO385178  

56216 (1999 HJ2)          Discovered 1999-Apr-19 by Lopez, A., Pacheco, R. at Mallorca
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 HJ2 = 2000 QF68 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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