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JPL Small-Body Database Browser
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1471 Tornio (1938 SL1)
Classification: Main-belt Asteroid          SPK-ID: 2001471
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1186940707071341 3.3319e-08  
a 2.716955962361347 1.0231e-08 au
q 2.39446939925666 9.1054e-08 au
i 13.60637997037838 4.6754e-06 deg
node 321.9366109744453 1.5764e-05 deg
peri 94.02622572935105 2.654e-05 deg
M 48.02643013854407 1.9811e-05 deg
tp 2458782.277196332975
(2019-Oct-25.77719633)
9.0054e-05 TDB
period 1635.770326745141
4.48
9.2392e-06
2.53e-08
d
yr
n .2200797961143657 1.2431e-09 deg/d
Q 3.039442525466034 1.1445e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2426  
   data-arc span      32465 days (88.88 yr)  
   first obs. used      1931-02-18  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40986  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 18:03:37  

Additional Information
 Earth MOID = 1.45265 au 
 Jupiter MOID = 2.30934 au 
 T_jup = 3.310 
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Orbital Elements at Epoch 2456438.5 (2013-May-26.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1167739069920102 3.3138e-08  
q 2.400242061983893 9.033e-08 au
tp 2457143.099729237160
(2015-Apr-30.59972924)
9.3381e-05 TDB
node 322.0756457177809 1.5734e-05 deg
peri 93.22674678405473 2.6968e-05 deg
i 13.6197732408894 4.6782e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2426  
   data-arc span      32465 days (88.88 yr)  
   first obs. used      1931-02-18  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40986  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 18:03:37  

Additional Information
 Jupiter MOID = 2.30934 au 
 T_jup = 3.310 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.09814149804738E-15 -2.978459354870825E-15 7.39529211776965E-15 -3.090978924434034E-15 -1.434424204912248E-14 -2.353860940380023E-15
q -2.978459354870825E-15 8.1594551068683E-15 -1.183153968417867E-13 7.473504773840047E-15 8.135944378801291E-15 6.598747935044536E-15
tp 7.39529211776965E-15 -1.183153968417867E-13 8.720055428908474E-9 -5.773975088414077E-12 2.055168920612671E-9 -1.113282248002569E-12
node -3.090978924434034E-15 7.473504773840047E-15 -5.773975088414077E-12 2.475524831683041E-10 -2.414479040496089E-10 -8.573811958749425E-13
peri -1.434424204912248E-14 8.135944378801291E-15 2.055168920612671E-9 -2.414479040496089E-10 7.272693273647126E-10 5.720667979113315E-13
i -2.353860940380023E-15 6.598747935044536E-15 -1.113282248002569E-12 -8.573811958749425E-13 5.720667979113315E-13 2.188528264109553E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.1   n/a MPO502167  
diameter diameter 28.719 km 0.399 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 6.60 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2002) Minor Planet Bull. 29, 34.]
geometric albedo albedo 0.085   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B T   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1471 Tornio (1938 SL1)          Discovered 1938-Sep-16 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1938 SL1 = 1931 BA = 1949 EK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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