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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04408773542694069 1.4933e-08  
a 2.206427472553552 6.0081e-09 au
q 2.109151081904878 3.1936e-08 au
i 4.258298343104246 3.6843e-07 deg
node 24.85851326577516 5.666e-06 deg
peri 236.6593796364349 1.8215e-05 deg
M 108.3249238858397 1.7805e-05 deg
tp 2458840.287480400838
(2019-Dec-22.78748040)
5.9698e-05 TDB
period 1197.106837502702
3.28
4.8896e-06
1.339e-08
d
yr
n .3007250386698986 1.2283e-09 deg/d
Q 2.303703863202226 6.273e-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      .44271  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:15:47  

Additional Information
 Earth MOID = 1.09578 au 
 Jupiter MOID = 2.70065 au 
 T_jup = 3.656 
[ 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 14.23   n/a E2021B10  
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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