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1312 Vassar (1933 OT)
Classification: Main-belt Asteroid          SPK-ID: 2001312
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 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2111043707874678 3.04e-08  
a 3.098141832917003 1.153e-08 au
q 2.444110550668727 9.5397e-08 au
i 21.94045919430114 3.8679e-06 deg
node 129.2318812190796 9.0363e-06 deg
peri 261.4925724939375 1.2912e-05 deg
M 321.778037138228 1.0646e-05 deg
tp 2459411.975887430793
(2021-Jul-16.47588743)
5.9298e-05 TDB
period 1991.821292653413
5.45
1.1119e-05
3.044e-08
d
yr
n .1807391061275505 1.009e-09 deg/d
Q 3.75217311516528 1.3965e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2967  
   data-arc span      31931 days (87.42 yr)  
   first obs. used      1933-07-27  
   last obs. used      2020-12-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36703  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:16:47  

Additional Information
 Earth MOID = 1.55709 au 
 Jupiter MOID = 2.12977 au 
 T_jup = 3.079 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456415.5 (2013-May-03.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2167348429848747 3.0539e-08  
q 2.422969630863397 9.6352e-08 au
tp 2455433.346625362449
(2010-Aug-24.84662536)
5.4086e-05 TDB
node 129.4725870550334 9.0851e-06 deg
peri 261.3584893227062 1.2722e-05 deg
i 21.9013428706391 3.8643e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2967  
   data-arc span      31931 days (87.42 yr)  
   first obs. used      1933-07-27  
   last obs. used      2020-12-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36703  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:16:47  

Additional Information
 Jupiter MOID = 2.12977 au 
 T_jup = 3.079 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.326113823830718E-16 -2.930814809362712E-15 -6.184595227466748E-14 8.368473106244427E-16 1.644832927489913E-14 7.983434114978654E-16
q -2.930814809362712E-15 9.283734379765207E-15 1.734247802678612E-13 -3.336663055144275E-15 -4.626526826390716E-14 -2.087513506293248E-15
tp -6.184595227466748E-14 1.734247802678612E-13 2.925309052867608E-9 4.030134021207157E-12 4.929454584251087E-10 2.723135360571253E-12
node 8.368473106244427E-16 -3.336663055144275E-15 4.030134021207157E-12 8.253973201660514E-11 -7.563752978944223E-11 -8.360123194638722E-12
peri 1.644832927489913E-14 -4.626526826390716E-14 4.929454584251087E-10 -7.563752978944223E-11 1.618430345588198E-10 8.232996384241899E-12
i 7.983434114978654E-16 -2.087513506293248E-15 2.723135360571253E-12 -8.360123194638722E-12 8.232996384241899E-12 1.49327679957114E-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 10.72   n/a E2021B10  
diameter diameter 36.28 km 1.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
rotation period rot_per 7.932 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Higgins, D.J. (2011) http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.0643   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6

1312 Vassar (1933 OT)          Discovered 1933-Jul-27 by Van Biesbroeck, G. at Williams Bay
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1933 OT = 1944 QE = 2019 FN5 = A908 CD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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