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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09075864152364385 3.8879e-08  
a 2.183380768452831 5.3159e-09 au
q 1.985220095979202 8.5624e-08 au
i 3.035874282719067 3.157e-06 deg
node 261.6873129699584 7.5843e-05 deg
peri 328.288833966216 7.8518e-05 deg
M 304.1332106928788 2.117e-05 deg
tp 2458783.370587460619
(2019-Oct-26.87058746)
6.9372e-05 TDB
period 1178.399766700589
3.23
4.3036e-06
1.178e-08
d
yr
n .3054990421527041 1.1157e-09 deg/d
Q 2.381541440926459 5.7983e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2828  
   data-arc span      37659 days (103.10 yr)  
   first obs. used      1916-04-01  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44386  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:25:54  

Additional Information
 Earth MOID = .97524 au 
 Jupiter MOID = 2.60618 au 
 T_jup = 3.672 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455929.5 (2012-Jan-03.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09057675582682446 3.8783e-08  
q 1.986122865492068 8.5352e-08 au
tp 2456426.358613503826
(2013-May-13.85861350)
6.9134e-05 TDB
node 261.7553009964224 7.5854e-05 deg
peri 328.2426795561414 7.8548e-05 deg
i 3.035351016119829 3.1563e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2828  
   data-arc span      37659 days (103.10 yr)  
   first obs. used      1916-04-01  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44386  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:25:54  

Additional Information
 Jupiter MOID = 2.60618 au 
 T_jup = 3.672 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.504086592967496E-15 -3.304934401326815E-15 -1.229517400673916E-12 4.605041792092628E-15 -3.328600804532132E-13 -7.788289965426018E-16
q -3.304934401326815E-15 7.285030152244196E-15 2.677209573231986E-12 -1.029588454765286E-14 7.211643021343662E-13 1.723585022405587E-15
tp -1.229517400673916E-12 2.677209573231986E-12 4.779559002795605E-9 -2.02714371357507E-11 1.426000340579744E-9 1.908317582773344E-12
node 4.605041792092628E-15 -1.029588454765286E-14 -2.02714371357507E-11 5.753839607533598E-9 -5.751285759970671E-9 -5.976255156207931E-11
peri -3.328600804532132E-13 7.211643021343662E-13 1.426000340579744E-9 -5.751285759970671E-9 6.169722572298707E-9 6.022544426269194E-11
i -7.788289965426018E-16 1.723585022405587E-15 1.908317582773344E-12 -5.976255156207931E-11 6.022544426269194E-11 9.962229674268909E-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-January); 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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