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1685 Toro (1948 OA)
Classification: Apollo [NEO]          SPK-ID: 2001685
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 571 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4358525288336133 3.8104e-09  
a 1.36756823990197 6.8798e-10 au
q .7715101641881628 4.9716e-09 au
i 9.382596925518623 4.3466e-07 deg
node 274.241451571502 1.6518e-06 deg
peri 127.2215291989419 2.0091e-06 deg
M 53.50195647153393 1.234e-06 deg
tp 2459113.686133492252
(2020-Sep-21.18613349)
1.9491e-06 TDB
period 584.1467117079659
1.60
4.408e-07
1.207e-09
d
yr
n .6162835342296266 4.6505e-10 deg/d
Q 1.963626315615777 9.8784e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.338120315084572E-15 6.437E-16
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      3415  
   # delay obs. used      7  
   # Doppler obs. used      2  
   data-arc span      26572 days (72.75 yr)  
   first obs. used      1948-07-17  
   last obs. used      2021-04-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .32012  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-17 06:23:39  

Additional Information
 Earth MOID = .0507761 au 
 Jupiter MOID = 3.4803 au 
 T_jup = 4.715 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456271.5 (2012-Dec-10.0) TDB
Reference: JPL 571 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4360093109776398 3.8128e-09  
q .7710786986094069 5.0308e-09 au
tp 2456193.449819169441
(2012-Sep-22.94981917)
1.1891e-06 TDB
node 274.3084240684248 1.653e-06 deg
peri 127.1165705487435 2.0103e-06 deg
i 9.381212207729122 4.3461e-07 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.338120315084572E-15 6.437E-16
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      3415  
   # delay obs. used      7  
   # Doppler obs. used      2  
   data-arc span      26572 days (72.75 yr)  
   first obs. used      1948-07-17  
   last obs. used      2021-04-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .32012  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-17 06:23:39  

Additional Information
 Jupiter MOID = 3.4803 au 
 T_jup = 4.715 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
Orbit Covariance (7×7)
  e q tp node peri i A2
e 1.453777630240754E-17 -1.916423352635487E-17 1.486658078511096E-15 -5.72863549674391E-16 2.571563738995131E-15 7.770727280978886E-16 1.463871114146171E-24
q -1.916423352635487E-17 2.530857304435732E-17 -2.128080721195812E-15 8.772336484036168E-16 -3.597379656580013E-15 -1.053302104022207E-15 -1.832367341175801E-24
tp 1.486658078511096E-15 -2.128080721195812E-15 1.413864150731323E-12 -2.210146378284132E-13 1.317105430808982E-12 1.36003723352355E-13 -1.488334703662101E-22
node -5.72863549674391E-16 8.772336484036168E-16 -2.210146378284132E-13 2.732354397722432E-12 -2.879980445273551E-12 -4.08446979238562E-13 1.524983002642464E-22
peri 2.571563738995131E-15 -3.597379656580013E-15 1.317105430808982E-12 -2.879980445273551E-12 4.041226804538637E-12 5.430571899119328E-13 -6.263434299156391E-23
i 7.770727280978886E-16 -1.053302104022207E-15 1.36003723352355E-13 -4.08446979238562E-13 5.430571899119328E-13 1.888881902389529E-13 2.802583613608336E-23
A2 1.463871114146171E-24 -1.832367341175801E-24 -1.488334703662101E-22 1.524983002642464E-22 -6.263434299156391E-23 2.802583613608336E-23 4.143726960507958E-31

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 14.33   n/a E2021B10  
diameter diameter 3.4 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
rotation period rot_per 10.1995 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Dunlap, J.L.; Gehrels, T.; Howes, M.L. (1973) Astron. J. 78, 491-501.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Torppa, J.; Aksnes, K.; Dai, Z.; Grav, T.; et al. (2005) Bull. Amer. Astron. Soc. 37, 643.]
[Higgins, D. (2008) Minor Planet Bull. 35, 30-32.]
[Higgins, D.; Pravec, P.; Kusnirak, P.; Hornoch, K.; Brinsfield, J.W.; Allen, B.; Warner, B.D. (2008) Minor Planet Bull. 35, 123-126.]
[Higgins, D. (2011) Minor Planet Bull. 38, 41-46.]
[Oey, J. (2011) Minor Planet Bull. 38, 221-223.]
[Warner, B.D. (2013). Minor Planet Bull. 40, 26-29.]
[Warner, B.D. (2016) Minor Planet Bull. 43, 240-250.]
[Oey, J.; Williams, H.; Groom, R. (2017) Minor Planet Bull. 44, 200-204.]
[Durech, J.; Vokrouhlicky, D.; Pravec, P.; Hanus, J.; et al. (2018) Astron. Astrophys. 609, A86.]
[Warner, B.D.; Stephens, R.D. (2020) Minor Planet Bull. 47, 290-304.]
geometric albedo albedo 0.31   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV 0.880   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=39.08, mean=63.48, max.=99.00) deg.
U-B UB 0.470   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=41.43, mean=59.67, max.=75.99) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B S   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)

1685 Toro (1948 OA)          Discovered 1948-Jul-17 by Wirtanen, C. A. at Mount Hamilton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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