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JPL Small-Body Database Browser
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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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09119983266475845 3.8384e-08  
a 2.184017358311405 5.2716e-09 au
q 1.984835340696477 8.4689e-08 au
i 3.035371410519701 3.097e-06 deg
node 261.6830742064442 7.5541e-05 deg
peri 328.2185373229412 7.8187e-05 deg
M 66.35827937586568 2.1062e-05 deg
tp 2458783.192271941362
(2019-Oct-26.69227194)
6.8862e-05 TDB
period 1178.91516833937
3.23
4.2683e-06
1.169e-08
d
yr
n .305365483173059 1.1056e-09 deg/d
Q 2.383199375926333 5.7523e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2898  
   data-arc span      37702 days (103.22 yr)  
   first obs. used      1916-04-01  
   last obs. used      2019-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44417  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:01:15  

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. 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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