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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1580136213719366 3.2514e-08  
a 3.105243905405934 1.5181e-08 au
q 2.614573070669607 9.9122e-08 au
i 2.29794384318068 3.6344e-06 deg
node 144.752701781581 9.0424e-05 deg
peri 286.06535779187 9.1259e-05 deg
M 230.367309066784 1.3223e-05 deg
tp 2459920.204203917168
(2022-Dec-06.70420392)
7.6355e-05 TDB
period 1998.674188933252
5.47
1.4657e-05
4.013e-08
d
yr
n .1801194021483521 1.3209e-09 deg/d
Q 3.595914740142261 1.758e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1674  
   data-arc span      25088 days (68.69 yr)  
   first obs. used      1951-12-01  
   last obs. used      2020-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50544  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:38:49  

Additional Information
 Earth MOID = 1.62975 au 
 Jupiter MOID = 1.69528 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 13.5   n/a MPO302167  
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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