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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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09119983068876752 3.8029e-08  
a 2.184017358448236 5.2502e-09 au
q 1.984835345136428 8.3862e-08 au
i 3.035371367673418 3.0921e-06 deg
node 261.6830736573407 7.5253e-05 deg
peri 328.2185385450506 7.7897e-05 deg
M 66.35827849757922 2.0971e-05 deg
tp 2458783.192274797121
(2019-Oct-26.69227480)
6.8571e-05 TDB
period 1178.915168450161
3.23
4.251e-06
1.164e-08
d
yr
n .3053654831443618 1.1011e-09 deg/d
Q 2.383199371760045 5.729e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2927  
   data-arc span      38013 days (104.07 yr)  
   first obs. used      1916-04-01  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44487  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:28:04  

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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