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16864 (1998 AL)
Classification: Main-belt Asteroid          SPK-ID: 2016864
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1832946436795206 3.0815e-08  
a 2.37591391569648 6.88e-09 au
q 1.94042162110568 7.1686e-08 au
i 5.623027576942076 3.1413e-06 deg
node 120.2960822116005 3.1778e-05 deg
peri 305.2309111644596 3.2945e-05 deg
M 190.4947185765758 8.675e-06 deg
tp 2460026.332710906667
(2023-Mar-22.83271091)
3.3456e-05 TDB
period 1337.65611326295
3.66
5.8103e-06
1.591e-08
d
yr
n .2691274658939439 1.169e-09 deg/d
Q 2.811406210287281 8.1411e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1763  
   data-arc span      10075 days (27.58 yr)  
   first obs. used      1993-11-15  
   last obs. used      2021-06-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4641  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:14:39  

Additional Information
 Earth MOID = .960361 au 
 Jupiter MOID = 2.49825 au 
 T_jup = 3.512 
[ 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 14.62   n/a E2021B10  
rotation period rot_per 19.166 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

16864 (1998 AL)          Discovered 1998-Jan-05 by Kobayashi, T. at Oizumi
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 AL = 1999 JB121 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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