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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09119987019823238 2.7401e-08  
a 2.184017354235516 4.4815e-09 au
q 1.98483525501855 5.8512e-08 au
i 3.035377136335786 2.4064e-06 deg
node 261.6829886613513 6.8758e-05 deg
peri 328.2186188143601 7.1419e-05 deg
M 66.35828804917402 1.9772e-05 deg
tp 2458783.192244146642
(2019-Oct-26.69224415)
6.4777e-05 TDB
period 1178.915165039172
3.23
3.6286e-06
9.935e-09
d
yr
n .3053654840278845 9.3989e-10 deg/d
Q 2.383199453452483 4.8902e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3409  
   data-arc span      38210 days (104.61 yr)  
   first obs. used      1916-04-01  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42411  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:02:00  

Additional Information
 Earth MOID = .974895 au 
 Jupiter MOID = 2.60379 au 
 T_jup = 3.671 
[ show covariance matrix ]

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. 2020-October); 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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