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37655 Illapa (1994 PM)
Classification: Apollo [NEO, PHA]          SPK-ID: 2037655
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 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7524525135657093 1.9966e-08  
a 1.477882391527751 4.6323e-10 au
q .3658460712681931 2.9538e-08 au
i 18.02503115608888 5.0747e-06 deg
node 139.5571937906936 5.5734e-06 deg
peri 303.8752501775078 6.4393e-06 deg
M 206.9413054927996 2.9912e-06 deg
tp 2459479.506128523996
(2021-Sep-22.00612852)
5.5136e-06 TDB
period 656.2332613121388
1.80
3.0854e-07
8.447e-10
d
yr
n .5485854211049587 2.5792e-10 deg/d
Q 2.589918711787309 8.1179e-10 au
  Orbit Determination Parameters
   # obs. used (total)      586  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      9808 days (26.85 yr)  
   first obs. used      1994-08-01  
   last obs. used      2021-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38651  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jun-08 05:52:15  

Additional Information
 Earth MOID = .0243137 au 
 Jupiter MOID = 2.82558 au 
 T_jup = 4.188 
[ 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 17.8   n/a MPO474232  
rotation period rot_per 2.6556 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pravec, P.; Wolf, M.; Sarounova, L. (2003) http://www.asu.cas.cz/~ppravec/neo.htm]

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

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