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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 491 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4358371101234201 5.7556e-09  
a 1.367586471676899 8.1654e-10 au
q .7715415360173549 7.8405e-09 au
i 9.383132281270342 3.3104e-06 deg
node 274.2452382733312 1.6385e-05 deg
peri 127.2065882952966 1.6564e-05 deg
M 290.2506511775094 2.0642e-06 deg
tp 2459113.679632021931
(2020-Sep-21.17963202)
3.3759e-06 TDB
period 584.1583930996781
1.60
5.2317e-07
1.432e-09
d
yr
n .6162712104327692 5.5193e-10 deg/d
Q 1.963631407336444 1.1724e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.097775713788239E-15 6.955E-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)      3002  
   # delay obs. used      7  
   # Doppler obs. used      2  
   data-arc span      26348 days (72.14 yr)  
   first obs. used      1948-07-17  
   last obs. used      2020-09-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .32086  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Sep-06 06:28:05  

Additional Information
 Earth MOID = .0506645 au 
 Jupiter MOID = 3.47931 au 
 T_jup = 4.715 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ show covariance matrix ]

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 14.3   n/a MPO473787  
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. 2019-August); 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.]
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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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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