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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06378925640678007 3.095e-08  
a 2.899846385063236 1.3139e-08 au
q 2.714867340466162 9.496e-08 au
i 2.998140858337917 3.7267e-06 deg
node 128.5283206906455 9.6261e-05 deg
peri 309.9463020124571 0.00010705 deg
M 312.8285802144944 4.5329e-05 deg
tp 2459436.840071596258
(2021-Aug-10.34007160)
0.00022719 TDB
period 1803.685921719832
4.94
1.2259e-05
3.356e-08
d
yr
n .1995912900715755 1.3565e-09 deg/d
Q 3.084825429660309 1.3978e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1930  
   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      .47311  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:44:08  

Additional Information
 Earth MOID = 1.73122 au 
 Jupiter MOID = 2.06557 au 
 T_jup = 3.282 
[ 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 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

[ show close-approach data ]
Alternate Designations
 1997 XA9 = 1990 QU14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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