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85774 (1998 UT18)
Classification: Apollo [NEO, PHA]          SPK-ID: 2085774
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 2455172.5 (2009-Dec-07.0) TDB
Reference: JPL 136 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3291671359264257 1.3399e-08  
a 1.4037551727889 1.543e-10 AU
q .9416851030200731 1.8762e-08 AU
i 13.58881310645482 8.0778e-06 deg
node 64.71182411244681 4.7591e-06 deg
peri 50.01325946809551 7.2395e-06 deg
M 200.3297537313525 2.0332e-06 deg
tp 2455441.936839571074
3.4124e-06 JED
period 607.4848915958165
n .5926073306190504 9.7707e-11 deg/d
Q 1.865825242557727 2.0509e-10 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -6.281306134668343E-15 1.63E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      593  
   # delay obs. used      4  
   # Doppler obs. used      4  
   data-arc span      9192 days (25.17 yr)  
   first obs. used      1989-04-30  
   last obs. used      2014-06-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47239  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 15:28:26  

Additional Information
 Earth MOID = .0358091 AU 
 T_jup = 4.660 
 Nongravitational accels. using nonstandard g(r) = (1 AU/ r)^2 
[ 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 19.2 mag n/a MPO236751  
rotation period rot_per 34. h n/a LCDB (Rev. 2015-Feb); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Krugly, Yu.N.; Bel'skaya, I.N.; Shevchenko, V.G.; et al. (2002) Icarus 158, 294-304.]
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

85774 (1998 UT18)          Discovered 1998-Oct-27 by CSS at Catalina
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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