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16978 (1999 AN4)
Classification: Main-belt Asteroid          SPK-ID: 2016978
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2360561310631309 1.9251e-08  
a 2.34076861134551 1.1879e-08 au
q 1.788215829237271 4.7455e-08 au
i 22.25985658922855 6.2291e-07 deg
node 316.0051641152749 3.0689e-06 deg
peri 276.8445718007723 3.9591e-06 deg
M 325.0652390046445 7.1548e-06 deg
tp 2459327.437935340041
(2021-Apr-22.93793534)
2.6704e-05 TDB
period 1308.085569226886
3.58
9.9572e-06
2.726e-08
d
yr
n .2752113534994272 2.0949e-09 deg/d
Q 2.893321393453749 1.4683e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1447  
   data-arc span      14064 days (38.51 yr)  
   first obs. used      1982-08-16  
   last obs. used      2021-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46309  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:49:36  

Additional Information
 Earth MOID = .918242 au 
 Jupiter MOID = 2.58197 au 
 T_jup = 3.429 
[ 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 E2021B10  
diameter diameter 3.818 km 0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.337   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

16978 (1999 AN4)          Discovered 1999-Jan-11 by Kobayashi, T. at Oizumi
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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