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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 585 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4358525289690254 3.809e-09  
a 1.367568239903447 6.8757e-10 au
q .7715101640038108 4.9695e-09 au
i 9.38259692707148 4.3428e-07 deg
node 274.2414515696483 1.6513e-06 deg
peri 127.2215292629222 2.0065e-06 deg
M 53.50195642573394 1.2337e-06 deg
tp 2459113.686133566428
(2020-Sep-21.18613357)
1.9486e-06 TDB
period 584.1467117089123
1.60
4.4054e-07
1.206e-09
d
yr
n .616283534228628 4.6477e-10 deg/d
Q 1.963626315803083 9.8725e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.330828651170804E-15 6.434E-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)      3487  
   # delay obs. used      7  
   # Doppler obs. used      2  
   data-arc span      26595 days (72.81 yr)  
   first obs. used      1948-07-17  
   last obs. used      2021-05-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .32251  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-11 05:55:02  

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 2456380.5 (2013-Mar-29.0) TDB
Reference: JPL 585 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4359794655019389 3.8105e-09  
q .7711082254856182 5.0248e-09 au
tp 2456193.444490231839
(2012-Sep-22.94449023)
1.1863e-06 TDB
node 274.3075464793952 1.6525e-06 deg
peri 127.1164943037735 2.0078e-06 deg
i 9.381220849326827 4.3424e-07 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.330828651170804E-15 6.434E-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)      3487  
   # delay obs. used      7  
   # Doppler obs. used      2  
   data-arc span      26595 days (72.81 yr)  
   first obs. used      1948-07-17  
   last obs. used      2021-05-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .32251  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-11 05:55:02  

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 1.45201564466268E-17 -1.912971383738279E-17 1.48167148528209E-15 -5.698754246770524E-16 2.56513977443012E-15 7.753095897028983E-16 1.463188019139284E-24
q -1.912971383738279E-17 2.524897019054019E-17 -2.120558535068926E-15 8.733758921395732E-16 -3.586849302293871E-15 -1.050482311583671E-15 -1.829275401889798E-24
tp 1.48167148528209E-15 -2.120558535068926E-15 1.407359953559058E-12 -2.18219682572852E-13 1.309138661589561E-12 1.350042858001129E-13 -1.475371685403103E-22
node -5.698754246770524E-16 8.733758921395732E-16 -2.18219682572852E-13 2.730723521034437E-12 -2.876014434174738E-12 -4.077761144159513E-13 1.520517436953732E-22
peri 2.56513977443012E-15 -3.586849302293871E-15 1.309138661589561E-12 -2.876014434174738E-12 4.031152185689597E-12 5.415912561434321E-13 -6.088022471314068E-23
i 7.753095897028983E-16 -1.050482311583671E-15 1.350042858001129E-13 -4.077761144159513E-13 5.415912561434321E-13 1.88561077757089E-13 2.812750055242366E-23
A2 1.463188019139284E-24 -1.829275401889798E-24 -1.475371685403103E-22 1.520517436953732E-22 -6.088022471314068E-23 2.812750055242366E-23 4.14022644666635E-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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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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