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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1638758287024953 8.9482e-08  
a 2.577219384137068 2.6794e-08 AU
q 2.154875421813472 2.2498e-07 AU
i 15.57054084271484 8.6707e-06 deg
node 64.97548979393213 3.3942e-05 deg
peri 273.0505419467269 4.4132e-05 deg
M 259.009463479726 3.5699e-05 deg
tp 2457424.439310636184
(2016-Feb-05.93931064)
0.00015334 JED
period 1511.212407495113
4.14
2.3567e-05
6.452e-08
d
yr
n .2382193252348375 3.7149e-09 deg/d
Q 2.999563346460665 3.1185e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      767  
   data-arc span      21724 days (59.48 yr)  
   first obs. used      1954-12-30  
   last obs. used      2014-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46276  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:36:46  

Additional Information
 Earth MOID = 1.21384 AU 
 T_jup = 3.357 
[ 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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