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37655 Illapa (1994 PM)
Classification: Apollo [NEO, PHA]          SPK-ID: 2037655
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.

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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 74 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7523349889890221 4.1372e-08  
a 1.477899085906186 6.0461e-10 au
q .3660238933840699 6.124e-08 au
i 18.00105253582005 1.4171e-05 deg
node 139.6983225622117 4.4281e-06 deg
peri 303.7197459687267 8.0471e-06 deg
M 49.18663622328287 3.1483e-06 deg
tp 2457510.837628812925
5.714e-06 JED
period 656.244380705746
n .5485761258829288 3.3664e-10 deg/d
Q 2.589774278428303 1.0595e-09 au
  Orbit Determination Parameters
   # obs. used (total)      420  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      7645 days (20.93 yr)  
   first obs. used      1994-08-01  
   last obs. used      2015-07-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4175  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 15:31:47  

Additional Information
 Earth MOID = .0239288 au 
 Jupiter MOID = 2.83041 au 
 T_jup = 4.189 
[ 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 17.9 mag n/a MPO266134  
rotation period rot_per 2.6556 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Behrend, R. (2003) Observatoire de Geneve web site,]
[Pravec, P.; Wolf, M.; Sarounova, L. (2003)]

37655 Illapa           Discovered 1994 Aug. 1 by C. S. Shoemaker and E. M. Shoemaker at Palomar.
Illapa was the thunder or weather god of the Incas. Hailing rain down from the celestial river (the Milky Way), Illapa fed the empire. According to legend, he would crack his sister's water jug with a slingshot, reverberating the echoes of thunder as water spilled forth from the sky, showering the parched lands below.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-02 21:17 UT
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