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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04418995970585087 2.9848e-08  
a 2.207115600499481 6.9147e-09 au
q 2.109583251047254 6.6148e-08 au
i 4.257744323813807 4.594e-06 deg
node 24.86739095454884 4.3953e-05 deg
peri 237.0370639486592 7.1775e-05 deg
M 47.80171807344773 5.6944e-05 deg
tp 2458841.470734538922
(2019-Dec-23.97073454)
0.0001895 TDB
period 1197.66690138673
3.28
5.6283e-06
1.541e-08
d
yr
n .3005844108935218 1.4126e-09 deg/d
Q 2.304647949951708 7.2203e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2199  
   data-arc span      11528 days (31.56 yr)  
   first obs. used      1989-01-10  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46521  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:03:08  

Additional Information
 Earth MOID = 1.0979 au 
 Jupiter MOID = 2.70148 au 
 T_jup = 3.655 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2   n/a MPO384892  
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

[ show close-approach data ]
Alternate Designations
 1999 AG2 = 1989 AO8 = 1993 HY6 = 1996 HS21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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