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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04418994385328118 2.4816e-08  
a 2.207115603156953 6.3686e-09 au
q 2.109583288575746 5.3298e-08 au
i 4.257740211155393 4.1687e-06 deg
node 24.86735787100233 4.1442e-05 deg
peri 237.0371084430772 6.9058e-05 deg
M 47.80170426783585 5.4642e-05 deg
tp 2458841.470780180938
(2019-Dec-23.97078018)
0.00018192 TDB
period 1197.666903549802
3.28
5.1837e-06
1.419e-08
d
yr
n .3005844103506449 1.301e-09 deg/d
Q 2.304647917738159 6.65e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2490  
   data-arc span      11610 days (31.79 yr)  
   first obs. used      1989-01-10  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44372  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:30:00  

Additional Information
 Earth MOID = 1.0979 au 
 Jupiter MOID = 2.70148 au 
 T_jup = 3.655 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457428.5 (2016-Feb-10.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04364858171092762 2.4859e-08  
q 2.110766263372599 5.3297e-08 au
tp 2457643.757094025996
(2016-Sep-12.25709403)
0.0001852 TDB
node 24.90887716338317 4.1419e-05 deg
peri 236.9319806456263 6.9537e-05 deg
i 4.259209400597365 4.1692e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2490  
   data-arc span      11610 days (31.79 yr)  
   first obs. used      1989-01-10  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44372  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:30:00  

Additional Information
 Jupiter MOID = 2.70148 au 
 T_jup = 3.655 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.179525572656184E-16 -1.317082515729949E-15 -8.960546754228171E-13 -2.42584215816919E-15 -2.798532461426442E-13 4.689394871684063E-16
q -1.317082515729949E-15 2.840575446915128E-15 1.719956473060922E-12 5.288238086875715E-15 5.384417064333146E-13 -9.896001527656865E-16
tp -8.960546754228171E-13 1.719956473060922E-12 3.429917916204573E-8 -2.74447771624621E-11 1.035235967952783E-8 -7.988697422709614E-12
node -2.42584215816919E-15 5.288238086875715E-15 -2.74447771624621E-11 1.715525791918844E-9 -1.718622237236238E-9 -7.321434618043949E-11
peri -2.798532461426442E-13 5.384417064333146E-13 1.035235967952783E-8 -1.718622237236238E-9 4.835460308825977E-9 7.061073943397754E-11
i 4.689394871684063E-16 -9.896001527656865E-16 -7.988697422709614E-12 -7.321434618043949E-11 7.061073943397754E-11 1.738244506850748E-11

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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