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JPL Small-Body Database Browser
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11885 Summanus (1990 SS)
Classification: Apollo [NEO]          SPK-ID: 2011885
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 59 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .474943502688727 4.2134e-08  
a 1.703312523654451 2.1409e-09 au
q .8943353074964309 7.1671e-08 au
i 19.41872855054462 1.7033e-05 deg
node 359.8627410342559 1.1095e-05 deg
peri 116.07737458989 1.6684e-05 deg
M 252.7533048066689 7.9365e-06 deg
tp 2458842.391915575857
(2019-Dec-24.89191558)
1.8179e-05 TDB
period 811.9699115234213
2.22
1.5308e-06
4.191e-09
d
yr
n .4433661825283237 8.359e-10 deg/d
Q 2.512289739812471 3.1577e-09 au
  Orbit Determination Parameters
   # obs. used (total)      295  
   data-arc span      10660 days (29.19 yr)  
   first obs. used      1990-09-25  
   last obs. used      2019-12-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4646  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 05:01:02  

Additional Information
 Earth MOID = .0674175 au 
 Jupiter MOID = 2.76397 au 
 T_jup = 4.005 
[ 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 18.5   n/a MPO196501  
diameter diameter 1.298 km 0.446 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2012ApJ...760L..12M)  
rotation period rot_per 7.358 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html]
geometric albedo albedo 0.033   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2012ApJ...760L..12M)  

11885 Summanus           Discovered 1990 Sept. 25 by Spacewatch at Kitt Peak.
Summanus was the Etruscan or Roman deity responsible for nocturnal lightning and thunder, as Jupiter was in daytime. This was the first earth-approacher discovered automatically by software and (lightning-fast) electronic computer; J. V. Scotti used D. L. Rabinowitz's Moving Object Detection Program at the telescope.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100923/MPCPages.arcLast Updated: 2010-12-06

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