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16555 Nagaomasami (1991 US3)
Classification: Main-belt Asteroid          SPK-ID: 2016555
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1639445498217018 8.7306e-08  
a 2.577852661431498 2.5977e-08 au
q 2.155227767346435 2.205e-07 au
i 15.56874690784663 8.4546e-06 deg
node 64.97173651440873 3.3573e-05 deg
peri 272.9700618981769 4.3555e-05 deg
M 354.3588861018629 3.5735e-05 deg
tp 2457424.189065661373
(2016-Feb-05.68906566)
0.00015026 JED
period 1511.769446972238
4.14
2.2851e-05
6.256e-08
d
yr
n .2381315489084699 3.5994e-09 deg/d
Q 3.000477555516561 3.0236e-08 au
  Orbit Determination Parameters
   # obs. used (total)      788  
   data-arc span      22091 days (60.48 yr)  
   first obs. used      1954-12-30  
   last obs. used      2015-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46325  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:18:51  

Additional Information
 Earth MOID = 1.21194 au 
 Jupiter MOID = 2.4863 au 
 T_jup = 3.356 
[ 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 13.0 mag n/a MPO256985  

16555 Nagaomasami           Discovered 1991 Oct. 31 by K. Endate and K. Watanabe at Kitami.
Masami Nagao (1966-1984) was a Japanese amateur astronomer who died in a traffic accident. His parents, friends of one of the discoverers, constructed an astronomical observatory and donated its equipment to a company active in the popularization of astronomy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

[ show close-approach data ]
Alternate Designations
 1991 US3 = 1998 HL119 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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