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JPL Small-Body Database Browser
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19364 Semafor (1997 SM1)
Classification: Main-belt Asteroid          SPK-ID: 2019364
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 .1075073503070864 4.0644e-08  
a 2.681138447344085 1.1536e-08 au
q 2.392896357063667 1.0591e-07 au
i 13.40434647937314 4.0471e-06 deg
node 199.031128437325 1.4444e-05 deg
peri 6.682740782685467 2.1433e-05 deg
M 201.1736778032354 1.7231e-05 deg
tp 2459707.952468364399
(2022-May-08.45246836)
7.8131e-05 TDB
period 1603.530731484581
4.39
1.035e-05
2.834e-08
d
yr
n .2245045841227531 1.449e-09 deg/d
Q 2.969380537624503 1.2777e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2145  
   data-arc span      24219 days (66.31 yr)  
   first obs. used      1953-09-16  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43047  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 01:02:37  

Additional Information
 Earth MOID = 1.38982 au 
 Jupiter MOID = 1.98928 au 
 T_jup = 3.329 
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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 MPO502315  
diameter diameter 7.058 km 0.132 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.204   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19364 Semafor           Discovered 1997 Sept. 21 by L. Šarounová at Ondřejov.
Theatre Semafor was a special phenomenon of Prague cultural life in the 1960s, with leading personalities Jiří Suchý (b. 1931) and Jiří Šlitr (1924-1969). Many of their songs became popular and they can be still heard by campfires. The name was suggested by L. Vašta.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020427/MPCPages.arcLast Updated: 2003-10-02

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