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18567 Segenthau (1997 SS4)
Classification: Main-belt Asteroid          SPK-ID: 2018567
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06867556417724913 2.9099e-08  
a 2.776943057830694 1.1531e-08 au
q 2.586234926646076 8.2063e-08 au
i 3.362644288386264 3.2461e-06 deg
node 241.8225986071981 5.8382e-05 deg
peri 76.23995752914446 6.5274e-05 deg
M 50.90173407471161 2.7357e-05 deg
tp 2458961.510420247227
(2020-Apr-22.01042025)
0.00012862 TDB
period 1690.241998135422
4.63
1.0527e-05
2.882e-08
d
yr
n .2129872529478805 1.3266e-09 deg/d
Q 2.967651189015313 1.2322e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1492  
   data-arc span      25802 days (70.64 yr)  
   first obs. used      1950-06-21  
   last obs. used      2021-02-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50439  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:31:59  

Additional Information
 Earth MOID = 1.57347 au 
 Jupiter MOID = 2.22171 au 
 T_jup = 3.329 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457538.5 (2016-May-30.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .070025457229468 2.9061e-08  
q 2.583455362446972 8.2271e-08 au
tp 2457277.509544559474
(2015-Sep-12.00954456)
0.00012815 TDB
node 241.8633752995641 5.8333e-05 deg
peri 77.78714016781784 6.5e-05 deg
i 3.363325260674551 3.2487e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1492  
   data-arc span      25802 days (70.64 yr)  
   first obs. used      1950-06-21  
   last obs. used      2021-02-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50439  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:31:59  

Additional Information
 Jupiter MOID = 2.22171 au 
 T_jup = 3.329 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.44531941363887E-16 -2.370322525171307E-15 6.380269240988057E-13 -1.19199752002268E-15 1.363066745694549E-13 -8.739889212531257E-16
q -2.370322525171307E-15 6.768595779463863E-15 -2.086121243499927E-12 3.32290178147782E-15 -4.442201376851356E-13 2.544880522613527E-15
tp 6.380269240988057E-13 -2.086121243499927E-12 1.64220499512252E-8 -2.001992209414976E-11 3.688198659361433E-9 -2.208966414579063E-12
node -1.19199752002268E-15 3.32290178147782E-15 -2.001992209414976E-11 3.402723566502504E-9 -3.40122948977222E-9 -3.147643125738874E-11
peri 1.363066745694549E-13 -4.442201376851356E-13 3.688198659361433E-9 -3.40122948977222E-9 4.224961253776116E-9 3.093625832160639E-11
i -8.739889212531257E-16 2.544880522613527E-15 -2.208966414579063E-12 -3.147643125738874E-11 3.093625832160639E-11 1.055429491208482E-11

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 14.58   n/a E2021B10  
diameter diameter 8.636 km 3.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.038   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

18567 Segenthau           Discovered 1997 Sept. 27 at the Starkenburg Observatory, Heppenheim.
Segenthau, located in the Banat region south of the Maros river, is a small village founded in 1771 by German colonialists. It is also the childhood home of Reiner Michael Stoss, discoverer of this minor planet.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20021120/MPCPages.arcLast Updated: 2003-10-02

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