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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .117700042894364 2.9814e-08  
a 2.288212250288825 9.5243e-09 au
q 2.018889570278421 6.9422e-08 au
i 5.297955670016054 4.6642e-06 deg
node 302.4546026199772 3.8677e-05 deg
peri 296.9350702792213 4.3867e-05 deg
M 67.35527639023633 2.0915e-05 deg
tp 2459159.955960969539
(2020-Nov-06.45596097)
7.3318e-05 TDB
period 1264.278889713086
3.46
7.8935e-06
2.161e-08
d
yr
n .2847472997684063 1.7778e-09 deg/d
Q 2.557534930299229 1.0645e-08 au
  Orbit Determination Parameters
   # obs. used (total)      590  
   data-arc span      8707 days (23.84 yr)  
   first obs. used      1997-10-06  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52109  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 02:01:47  

Additional Information
 Earth MOID = 1.01318 au 
 Jupiter MOID = 2.47032 au 
 T_jup = 3.585 
[ 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 16.50   n/a E2021B10  
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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