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16688 (1994 PN21)
Classification: Main-belt Asteroid          SPK-ID: 2016688
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1562820090833721 3.2328e-08  
a 3.108280532296506 1.6349e-08 au
q 2.622512205914475 9.7837e-08 au
i 2.302540192990712 3.6375e-06 deg
node 144.7082118298482 8.9905e-05 deg
peri 285.9466434122766 9.0767e-05 deg
M 265.6557357045875 1.3492e-05 deg
tp 2459921.055857305525
(2022-Dec-07.55585731)
7.7263e-05 TDB
period 2001.606669364545
5.48
1.5792e-05
4.324e-08
d
yr
n .1798555158263387 1.419e-09 deg/d
Q 3.594048858678538 1.8904e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1695  
   data-arc span      25405 days (69.56 yr)  
   first obs. used      1951-12-01  
   last obs. used      2021-06-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50334  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:41:40  

Additional Information
 Earth MOID = 1.63796 au 
 Jupiter MOID = 1.69783 au 
 T_jup = 3.200 
[ 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 13.54   n/a MPCxxxxx  
diameter diameter 9.491 km 0.451 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.086   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

16688 (1994 PN21)          Discovered 1994-Aug-12 by Elst, E. W. at La Silla
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1994 PN21 = 1951 XK1 = 1984 YX = 1984 YX2 = 1985 DA1 = 1996 BP4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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