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15998 (1999 AG2)
Classification: Main-belt Asteroid          SPK-ID: 2015998
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04398357169248961 1.4936e-08  
a 2.206562327807423 5.982e-09 au
q 2.109509835468359 3.193e-08 au
i 4.258216345049719 3.6842e-07 deg
node 24.8577176138174 5.6661e-06 deg
peri 236.637809138827 1.8251e-05 deg
M 167.2959646193917 1.7766e-05 deg
tp 2458840.140266515255
(2019-Dec-22.64026652)
5.9828e-05 TDB
period 1197.21658863786
3.28
4.8685e-06
1.333e-08
d
yr
n .3006974706302658 1.2228e-09 deg/d
Q 2.303614820146488 6.2451e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2709  
   data-arc span      11721 days (32.09 yr)  
   first obs. used      1989-01-10  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4426  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:32:19  

Additional Information
 Earth MOID = 1.09787 au 
 Jupiter MOID = 2.6995 au 
 T_jup = 3.656 
[ 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 14.22   n/a MPCxxxxx  
diameter diameter 7.005 km 0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.074   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

15998 (1999 AG2)          Discovered 1999-Jan-09 by Kobayashi, T. at Oizumi
Reference: 20000726/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 AG2 = 1989 AO8 = 1993 HY6 = 1996 HS21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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