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138 Tolosa (A874 KA)
Classification: Main-belt Asteroid          SPK-ID: 2000138
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 80 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1624456594351833 2.1911e-08  
a 2.448536748883952 5.2221e-09 au
q 2.050782582060219 5.5238e-08 au
i 3.202458002435956 6.46e-07 deg
node 54.7336553992838 4.3166e-06 deg
peri 260.50053065 5.6082e-06 deg
M 90.56580839531327 3.8976e-06 deg
tp 2459044.437203863881
(2020-Jul-13.93720386)
1.4718e-05 TDB
period 1399.453158478754
3.83
4.477e-06
1.226e-08
d
yr
n .2572433366696821 8.2294e-10 deg/d
Q 2.846290915707686 6.0704e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3281  
   data-arc span      45192 days (123.73 yr)  
   first obs. used      1897-05-30  
   last obs. used      2021-02-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47836  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:34:57  

Additional Information
 Earth MOID = 1.03942 au 
 Jupiter MOID = 2.43141 au 
 T_jup = 3.477 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457444.5 (2016-Feb-26.0) TDB
Reference: JPL 80 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1622124590239039 2.1876e-08  
q 2.051471419165558 5.5186e-08 au
tp 2457646.020779990785
(2016-Sep-14.52077999)
1.3944e-05 TDB
node 54.76261003607984 4.3144e-06 deg
peri 260.82805935634 5.591e-06 deg
i 3.203868621760258 6.4622e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3281  
   data-arc span      45192 days (123.73 yr)  
   first obs. used      1897-05-30  
   last obs. used      2021-02-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47836  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:34:57  

Additional Information
 Jupiter MOID = 2.43141 au 
 T_jup = 3.477 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.785483521765632E-16 -1.203804706208385E-15 -1.433205823750731E-13 -4.189116911085295E-14 3.817872037127623E-14 -2.65355141761583E-15
q -1.203804706208385E-15 3.045503574794875E-15 3.540321314957711E-13 1.04432236521165E-13 -9.821112835067928E-14 6.618086493197296E-15
tp -1.433205823750731E-13 3.540321314957711E-13 1.944216958740975E-10 2.878943257085235E-12 3.817379435698072E-11 3.434018969402229E-13
node -4.189116911085295E-14 1.04432236521165E-13 2.878943257085235E-12 1.861388717180508E-11 -1.928094277092449E-11 1.311007781854311E-12
peri 3.817872037127623E-14 -9.821112835067928E-14 3.817379435698072E-11 -1.928094277092449E-11 3.125950869935193E-11 -1.317596239709038E-12
i -2.65355141761583E-15 6.618086493197296E-15 3.434018969402229E-13 1.311007781854311E-12 -1.317596239709038E-12 4.175940216689954E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.81   n/a E2020-QM5 IRAS observations used: 6
diameter diameter 52.905 km 1.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.101 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W. (1996) I.A.P.P.P. Comm. 65, 54-55.]
[Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planet. Space Sci. 53, 1147-1165.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Mendez, O.; Scheck, J.; Sosa, N. (2011) http://www.fisica.edu.uy/oalm/aster/aster.html]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.273   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.877   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.42, mean=7.21, max.=9.52) deg.
U-B UB 0.490   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.42, mean=7.21, max.=9.52) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

138 Tolosa (A874 KA)          Discovered 1874-May-19 by Perrotin, J. at Toulouse
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A874 KA = A909 SB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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