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1686 De Sitter (1935 SR1)
Classification: Main-belt Asteroid          SPK-ID: 2001686
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 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .159808116895225 2.8848e-08  
a 3.164037192759286 1.157e-08 au
q 2.658398367197971 8.9337e-08 au
i .6168672447788385 3.3152e-06 deg
node 6.31839795218748 0.00029594 deg
peri 294.5788718264719 0.00029612 deg
M 142.7141909904151 1.1135e-05 deg
tp 2458581.560335934940
(2019-Apr-08.06033594)
6.2306e-05 TDB
period 2055.705021535843
5.63
1.1275e-05
3.087e-08
d
yr
n .1751224014285082 9.6053e-10 deg/d
Q 3.669676018320602 1.3419e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3851  
   data-arc span      32158 days (88.04 yr)  
   first obs. used      1933-04-14  
   last obs. used      2021-04-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42346  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:40:17  

Additional Information
 Earth MOID = 1.64245 au 
 Jupiter MOID = 1.55647 au 
 T_jup = 3.184 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456819.5 (2014-Jun-11.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1634260202360066 2.8581e-08  
q 2.643955961690044 8.8767e-08 au
tp 2456531.696324331582
(2013-Aug-27.19632433)
5.9606e-05 TDB
node 6.513539025692028 0.00029319 deg
peri 294.9561312317697 0.00029337 deg
i .6221648507658976 3.3212e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3851  
   data-arc span      32158 days (88.04 yr)  
   first obs. used      1933-04-14  
   last obs. used      2021-04-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42346  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:40:17  

Additional Information
 Jupiter MOID = 1.55647 au 
 T_jup = 3.184 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.168581768013099E-16 -2.52276069273025E-15 1.44544584589787E-13 3.178915486496668E-15 6.866546151296881E-15 -1.195638974911828E-17
q -2.52276069273025E-15 7.879517537057686E-15 -4.385004385767533E-13 -1.176416650859372E-14 -1.693169958014151E-14 4.567313560821337E-17
tp 1.44544584589787E-13 -4.385004385767533E-13 3.552855372938643E-9 -4.031427787206314E-12 6.229308906533973E-10 -8.295197315176699E-14
node 3.178915486496668E-15 -1.176416650859372E-14 -4.031427787206314E-12 8.596290647773924E-8 -8.595767773934281E-8 8.180096915924967E-11
peri 6.866546151296881E-15 -1.693169958014151E-14 6.229308906533973E-10 -8.595767773934281E-8 8.606610411635212E-8 -8.18099684186818E-11
i -1.195638974911828E-17 4.567313560821337E-17 -8.295197315176699E-14 8.180096915924967E-11 -8.18099684186818E-11 1.103026109074072E-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 11.20   n/a E2021B10  
diameter diameter 29.661 km 0.290 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.292 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Polakis, T. (2020) Minor Planet Bull. 47, 13-17.]
geometric albedo albedo 0.088   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1686 De Sitter (1935 SR1)          Discovered 1935-Sep-28 by Van Gent, H. at Johannesburg (LS)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1935 SR1 = 1929 RK1 = 1933 GF = 1951 NG = 1952 UO1 = 1956 GG = 1958 VA = 1963 RD = 1967 GK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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