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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 608 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4359178059927995 3.8054e-09  
a 1.36746538703175 6.9351e-10 au
q .7713628757457749 4.9625e-09 au
i 9.382661959102412 4.3409e-07 deg
node 274.2374117835928 1.6511e-06 deg
peri 127.2161644286938 2.005e-06 deg
M 174.3105389993893 1.31e-06 deg
tp 2459113.690440413283
(2020-Sep-21.19044041)
1.9478e-06 TDB
period 584.0808136768767
1.60
4.4432e-07
1.216e-09
d
yr
n .6163530654837741 4.6887e-10 deg/d
Q 1.963567898317724 9.9582e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.33893075153415E-15 6.433E-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)      3629  
   # delay obs. used      7  
   # Doppler obs. used      2  
   data-arc span      26669 days (73.02 yr)  
   first obs. used      1948-07-17  
   last obs. used      2021-07-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .31972  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-24 05:48:23  

Additional Information
 Earth MOID = .0506061 au 
 Jupiter MOID = 3.48146 au 
 T_jup = 4.716 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456495.5 (2013-Jul-22.0) TDB
Reference: JPL 608 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4359129419166165 3.8088e-09  
q .7712373232120169 5.0219e-09 au
tp 2456777.360631884861
(2014-Apr-29.86063189)
1.1384e-06 TDB
node 274.3064888001491 1.6521e-06 deg
peri 127.1202176708694 2.0063e-06 deg
i 9.381267125696242 4.3403e-07 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.33893075153415E-15 6.433E-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)      3629  
   # delay obs. used      7  
   # Doppler obs. used      2  
   data-arc span      26669 days (73.02 yr)  
   first obs. used      1948-07-17  
   last obs. used      2021-07-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .31972  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-24 05:48:23  

Additional Information
 Jupiter MOID = 3.48146 au 
 T_jup = 4.716 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
Orbit Covariance (7×7)
  e q tp node peri i A2
e 1.450667755717283E-17 -1.910940290055191E-17 2.302016905909499E-15 -5.687154687299035E-16 2.561709989588879E-15 7.743773077492474E-16 1.462155364220112E-24
q -1.910940290055191E-17 2.521922930186809E-17 -3.148021355429472E-15 8.719974598921043E-16 -3.581865702655961E-15 -1.049155402742377E-15 -1.827138551277673E-24
tp 2.302016905909499E-15 -3.148021355429472E-15 1.295953769511422E-12 -1.095383175311281E-13 1.214688488326229E-12 1.453537184387932E-13 4.825146758655812E-23
node -5.687154687299035E-16 8.719974598921043E-16 -1.095383175311281E-13 2.729592072841881E-12 -2.87357519335173E-12 -4.074129863433995E-13 1.517877170904947E-22
peri 2.561709989588879E-15 -3.581865702655961E-15 1.214688488326229E-12 -2.87357519335173E-12 4.025068992670801E-12 5.407583891424996E-13 -5.995401845625253E-23
i 7.743773077492474E-16 -1.049155402742377E-15 1.453537184387932E-13 -4.074129863433995E-13 5.407583891424996E-13 1.88383067744217E-13 2.81961889586307E-23
A2 1.462155364220112E-24 -1.827138551277673E-24 4.825146758655812E-23 1.517877170904947E-22 -5.995401845625253E-23 2.81961889586307E-23 4.138686473349246E-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 14.3   n/a MPO614063  
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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