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16845 (1997 XA9)
Classification: Main-belt Asteroid          SPK-ID: 2016845
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06395717654551565 3.0949e-08  
a 2.900315597661002 1.3101e-08 au
q 2.714819600943684 9.4957e-08 au
i 2.998144070119666 3.7263e-06 deg
node 128.5272057708573 9.6255e-05 deg
peri 309.9381122807445 0.000107 deg
M 351.9612292538287 4.5225e-05 deg
tp 2459436.785935846408
(2021-Aug-10.28593585)
0.00022665 TDB
period 1804.123710284213
4.94
1.2224e-05
3.347e-08
d
yr
n .199542857259654 1.352e-09 deg/d
Q 3.085811594378319 1.3939e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1932  
   data-arc span      12542 days (34.34 yr)  
   first obs. used      1986-10-31  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47627  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:44:05  

Additional Information
 Earth MOID = 1.73147 au 
 Jupiter MOID = 2.06475 au 
 T_jup = 3.282 
[ 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 13.50   n/a E2021B10  
diameter diameter 5.687 km 0.286 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.261   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

16845 (1997 XA9)          Discovered 1997-Dec-07 by ODAS at Caussols
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 XA9 = 1990 QU14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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