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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1638294092441428 8.9447e-08  
a 2.577104300728078 2.6939e-08 AU
q 2.154898825579258 2.248e-07 AU
i 15.57056949781208 8.6708e-06 deg
node 64.9759091917217 3.3942e-05 deg
peri 273.0825202162007 4.4139e-05 deg
M 211.319549874389 3.5334e-05 deg
tp 2457424.590809185881
(2016-Feb-06.09080919)
0.00015337 JED
period 1511.111185882912
4.14
2.3694e-05
6.487e-08
d
yr
n .2382352823294463 3.7355e-09 deg/d
Q 2.999309775876899 3.1353e-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 = 1.21234 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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