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91221 (1999 AM15)
Classification: Main-belt Asteroid          SPK-ID: 2091221
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1172689364531154 3.1773e-08  
a 2.287246577644006 1.0428e-08 au
q 2.019023604077665 7.5062e-08 au
i 5.298902924497646 4.6985e-06 deg
node 302.4546766797974 4.0174e-05 deg
peri 296.8129879558794 4.524e-05 deg
M 314.6736387582175 2.0943e-05 deg
tp 2459159.580248770351
(2020-Nov-06.08024877)
7.3597e-05 TDB
period 1263.478646605657
3.46
8.6404e-06
2.366e-08
d
yr
n .2849276487316523 1.9485e-09 deg/d
Q 2.555469551210346 1.165e-08 au
  Orbit Determination Parameters
   # obs. used (total)      559  
   data-arc span      8235 days (22.55 yr)  
   first obs. used      1997-10-06  
   last obs. used      2020-04-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52112  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 16:38:42  

Additional Information
 Earth MOID = 1.01306 au 
 Jupiter MOID = 2.47436 au 
 T_jup = 3.586 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457143.5 (2015-May-01.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .117739117948343 3.1704e-08  
q 2.017894555324475 7.4936e-08 au
tp 2456632.336222045811
(2013-Dec-05.83622205)
7.3797e-05 TDB
node 302.5090145037259 4.0158e-05 deg
peri 296.7593706275633 4.5203e-05 deg
i 5.300181211721686 4.6997e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      559  
   data-arc span      8235 days (22.55 yr)  
   first obs. used      1997-10-06  
   last obs. used      2020-04-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52112  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 16:38:42  

Additional Information
 Jupiter MOID = 2.47436 au 
 T_jup = 3.586 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.005142933767913E-15 -2.358580640204808E-15 7.084804774459532E-14 -1.996214539206458E-15 1.188669843468558E-14 -2.430709494435667E-16
q -2.358580640204808E-15 5.615356519746064E-15 -2.590663469623098E-13 4.54489790508204E-15 -4.674333644189236E-14 8.205104946116959E-16
tp 7.084804774459532E-14 -2.590663469623098E-13 5.446053194971242E-9 1.088999784921087E-11 1.540803576055137E-9 -8.473016905845427E-13
node -1.996214539206458E-15 4.54489790508204E-15 1.088999784921087E-11 1.612699125224554E-9 -1.602266416138195E-9 3.915801000907111E-11
peri 1.188669843468558E-14 -4.674333644189236E-14 1.540803576055137E-9 -1.602266416138195E-9 2.043346200032254E-9 -3.92060943236574E-11
i -2.430709494435667E-16 8.205104946116959E-16 -8.473016905845427E-13 3.915801000907111E-11 -3.92060943236574E-11 2.208729201088502E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.4   n/a MPO468897  
diameter diameter 1.929 km 0.180 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.143   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91221 (1999 AM15)          Discovered 1999-Jan-09 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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