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1661 Granule (A916 FA)
Classification: Main-belt Asteroid          SPK-ID: 2001661
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09119983473766809 3.7153e-08  
a 2.184017358088982 5.1945e-09 au
q 1.984835335967068 8.1816e-08 au
i 3.035371501424335 3.0733e-06 deg
node 261.6830699152525 7.4552e-05 deg
peri 328.2185414140046 7.7203e-05 deg
M 66.35827981872529 2.0803e-05 deg
tp 2458783.192270524298
(2019-Oct-26.69227052)
6.8034e-05 TDB
period 1178.915168159277
3.23
4.2059e-06
1.152e-08
d
yr
n .3053654832197073 1.0894e-09 deg/d
Q 2.383199380210896 5.6682e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2996  
   data-arc span      38053 days (104.18 yr)  
   first obs. used      1916-04-01  
   last obs. used      2020-06-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44232  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:34:38  

Additional Information
 Earth MOID = .974895 au 
 Jupiter MOID = 2.60379 au 
 T_jup = 3.671 
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Orbital Elements at Epoch 2456060.5 (2012-May-13.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09080496467280166 3.7084e-08  
q 1.985097416864301 8.1477e-08 au
tp 2456426.531804793598
(2013-May-14.03180479)
6.804e-05 TDB
node 261.7567561910591 7.4532e-05 deg
peri 328.3503543032653 7.7211e-05 deg
i 3.035997261114592 3.0738e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2996  
   data-arc span      38053 days (104.18 yr)  
   first obs. used      1916-04-01  
   last obs. used      2020-06-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44232  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:34:38  

Additional Information
 Jupiter MOID = 2.60379 au 
 T_jup = 3.671 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.375232672736238E-15 -3.016612126396552E-15 -1.139851340469389E-12 4.621073475338171E-15 -3.118241866696485E-13 -7.180305325715139E-16
q -3.016612126396552E-15 6.638559500151327E-15 2.478765450678405E-12 -9.812243067814069E-15 6.745912198442121E-13 1.587971008349955E-15
tp -1.139851340469389E-12 2.478765450678405E-12 4.629453628150575E-9 -2.085358472293917E-11 1.387655441684352E-9 1.830340509606137E-12
node 4.621073475338171E-15 -9.812243067814069E-15 -2.085358472293917E-11 5.555051953718612E-9 -5.553004185897106E-9 -5.361425761393095E-11
peri -3.118241866696485E-13 6.745912198442121E-13 1.387655441684352E-9 -5.553004185897106E-9 5.961597597648477E-9 5.406525130580384E-11
i -7.180305325715139E-16 1.587971008349955E-15 1.830340509606137E-12 -5.361425761393095E-11 5.406525130580384E-11 9.448161391428185E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9   n/a MPO265965  
rotation period rot_per 24. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]

1661 Granule (A916 FA)          Discovered 1916-Mar-31 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A916 FA = 1936 PM = 1949 QG1 = 1949 SJ = 1961 DB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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