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20157 (1996 TS18)
Classification: Main-belt Asteroid          SPK-ID: 2020157
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08727659138472767 3.4521e-08  
a 2.347447557065828 8.7884e-09 au
q 2.142570335830717 8.1176e-08 au
i 1.469273957151496 3.8911e-06 deg
node 16.8873448463539 0.00014012 deg
peri 146.0698801498685 0.00014174 deg
M 195.5661836711456 2.1343e-05 deg
tp 2459996.540978512707
(2023-Feb-21.04097851)
7.856e-05 TDB
period 1313.688127462556
3.60
7.3773e-06
2.02e-08
d
yr
n .2740376444562646 1.5389e-09 deg/d
Q 2.55232477830094 9.5554e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1181  
   data-arc span      12131 days (33.21 yr)  
   first obs. used      1987-04-01  
   last obs. used      2020-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:14:20  

Additional Information
 Earth MOID = 1.15119 au 
 Jupiter MOID = 2.41677 au 
 T_jup = 3.554 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456642.5 (2013-Dec-16.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08672965898240113 3.4337e-08  
q 2.14389088025745 8.0652e-08 au
tp 2456053.454479085279
(2012-May-05.95447909)
7.7213e-05 TDB
node 16.97015055406948 0.00014019 deg
peri 145.5686675891083 0.00014185 deg
i 1.469639536245747 3.8878e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1181  
   data-arc span      12131 days (33.21 yr)  
   first obs. used      1987-04-01  
   last obs. used      2020-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:14:20  

Additional Information
 Jupiter MOID = 2.41677 au 
 T_jup = 3.554 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.179063075555172E-15 -2.756164313995939E-15 2.132489934052445E-13 -2.127271213887199E-15 7.909065277655675E-14 -6.471864426694232E-17
q -2.756164313995939E-15 6.504680212061871E-15 -5.244902936501642E-13 3.784863354094006E-15 -1.841991291984422E-13 1.802652783350765E-16
tp 2.132489934052445E-13 -5.244902936501642E-13 5.961911949094153E-9 -1.212174393623997E-11 1.676857876259068E-9 6.144059122373875E-13
node -2.127271213887199E-15 3.784863354094006E-15 -1.212174393623997E-11 1.965414472599017E-8 -1.965099007038807E-8 -2.124429277011489E-11
peri 7.909065277655675E-14 -1.841991291984422E-13 1.676857876259068E-9 -1.965099007038807E-8 2.012092206944979E-8 2.141572988575394E-11
i -6.471864426694232E-17 1.802652783350765E-16 6.144059122373875E-13 -2.124429277011489E-11 2.141572988575394E-11 1.51147544834549E-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 15.55   n/a E2021B10  
diameter diameter 2.594 km 0.634 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.199   0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20157 (1996 TS18)          Discovered 1996-Oct-04 by Spacewatch at Kitt Peak
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2024-Dec-14 05:14 00:01 Psych 0.0419397970764106 0.0419381806070911 0.0419414135692108 2.66268271279122 2.66268260444658 2460658.717810284 1.42370780250526 97.5032627889509 35.4383341695399 -37.3053460579684 118639.218138006 T 24 CATAB v2.0f-lin.ifort 2021-Apr-13 03:14:26 2021-Apr-13 03:14
2114-Dec-28 23:24 00:10 Psych 0.0452113578408382 0.0452041176541801 0.0452185985576849 2.36134438786406 2.3613442745337 2493544.474755664 10.4520109259931 434.917717279738 27.2287641326885 34.2061933764994 139869.81742741 T 24 CATAB v2.0f-lin.ifort 2021-Apr-13 03:14:26 2021-Apr-13 03:14

Alternate Designations
 1996 TS18 = 1987 GM = 1998 FY74 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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