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JPL Small-Body Database Browser
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4677 Hiroshi (1990 SQ4)
Classification: Main-belt Asteroid          SPK-ID: 2004677
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1945085449676375 3.0272e-08  
a 3.13168013551645 1.3355e-08 au
q 2.522541589053091 9.5415e-08 au
i .4814515597912103 4.053e-06 deg
node 11.95159794561872 0.00042964 deg
peri 54.31524116752349 0.00042978 deg
M 78.6847429408748 1.0298e-05 deg
tp 2458558.061865220556
(2019-Mar-15.56186522)
5.7329e-05 TDB
period 2024.251749037092
5.54
1.2949e-05
3.545e-08
d
yr
n .1778434921304857 1.1376e-09 deg/d
Q 3.740818681979809 1.5953e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2220  
   data-arc span      23991 days (65.68 yr)  
   first obs. used      1954-05-31  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47037  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:18:49  

Additional Information
 Earth MOID = 1.53637 au 
 Jupiter MOID = 1.57968 au 
 T_jup = 3.183 
[ 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 12.8   n/a MPO452231  
diameter diameter 13.977 km 0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.143   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4677 Hiroshi (1990 SQ4)          Discovered 1990-Sep-26 by Takahashi and Watanabe at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1990 SQ4 = 1968 UF1 = 1976 GZ4 = 1979 TX1 = 1979 WR = 1981 EF49 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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