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21580 Portalatin (1998 SY57)
Classification: Main-belt Asteroid          SPK-ID: 2021580
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06014476600402298 5.5236e-08  
a 2.897876691813378 2.0715e-08 au
q 2.72358457627575 1.6434e-07 au
i 3.048732250096008 4.653e-06 deg
node 76.46573298296293 0.00013794 deg
peri 239.4492619516086 0.00015336 deg
M 265.0624236699086 6.8702e-05 deg
tp 2458075.675367352961
0.00034494 JED
period 1801.848528893253
n .1997948186139277 2.1423e-09 deg/d
Q 3.072168807351006 2.1961e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1477  
   data-arc span      9188 days (25.16 yr)  
   first obs. used      1991-02-20  
   last obs. used      2016-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49871  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:37:04  

Additional Information
 Earth MOID = 1.71089 au 
 Jupiter MOID = 2.0928 au 
 T_jup = 3.283 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.3 mag n/a MPO337440  
rotation period rot_per 3.6266 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2016) Astron. J. 150, A75.]

21580 Portalatin           Discovered 1998 Sept. 17 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Wilfredo Portalatin (b. 1949), staff technician and telescope operator at the Arecibo Observatory, has played a key role in numerous radar experiments on minor planets since the 1970s.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

[ show close-approach data ]
Alternate Designations
 1998 SY57 = 1999 XJ100 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-05 21:55 UT
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