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7231 Porco (1985 TQ1)
Classification: Main-belt Asteroid          SPK-ID: 2007231
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07200826885300432 2.1037e-08  
a 3.171466569079152 1.6028e-08 au
q 2.943094751714586 6.9999e-08 au
i 9.430420984656267 7.7635e-07 deg
node 21.27401516021536 5.6998e-06 deg
peri 322.7205598127005 1.4388e-05 deg
M 108.463964755487 1.4956e-05 deg
tp 2458578.956386649673
(2019-Apr-05.45638665)
8.4807e-05 TDB
period 2062.949674673389
5.65
1.5638e-05
4.281e-08
d
yr
n .1745074077277217 1.3229e-09 deg/d
Q 3.399838386443719 1.7182e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2338  
   data-arc span      16960 days (46.43 yr)  
   first obs. used      1974-10-12  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43787  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 23:20:36  

Additional Information
 Earth MOID = 1.94158 au 
 Jupiter MOID = 1.96521 au 
 T_jup = 3.177 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457372.5 (2015-Dec-16.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07322313255287703 2.0904e-08  
q 2.939732177121511 6.9613e-08 au
tp 2456493.179465673578
(2013-Jul-19.67946567)
8.3942e-05 TDB
node 21.35516540713878 5.7075e-06 deg
peri 318.9902183966082 1.446e-05 deg
i 9.427264515743513 7.7969e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2338  
   data-arc span      16960 days (46.43 yr)  
   first obs. used      1974-10-12  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43787  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 23:20:36  

Additional Information
 Jupiter MOID = 1.96521 au 
 T_jup = 3.177 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.36958595083371E-16 -1.421766015188285E-15 1.035512587733003E-12 -1.096199756427628E-14 1.508525047799936E-13 2.86450538732882E-15
q -1.421766015188285E-15 4.845923814837379E-15 -3.307597232090965E-12 3.320509032322569E-14 -4.642922263122148E-13 -8.542499312013999E-15
tp 1.035512587733003E-12 -3.307597232090965E-12 7.046268429915472E-9 -3.451400710443733E-11 1.103989483305177E-9 -4.916901538921431E-12
node -1.096199756427628E-14 3.320509032322569E-14 -3.451400710443733E-11 3.257612111867137E-11 -3.840851255760859E-11 -3.586457328713728E-12
peri 1.508525047799936E-13 -4.642922263122148E-13 1.103989483305177E-9 -3.840851255760859E-11 2.090793177402445E-10 2.626487635664716E-12
i 2.86450538732882E-15 -8.542499312013999E-15 -4.916901538921431E-12 -3.586457328713728E-12 2.626487635664716E-12 6.079239532724687E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.44   n/a MPCxxxxx  
diameter diameter 18.328 km 0.283 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.074   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7231 Porco           Discovered 1985 Oct. 15 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of Carolyn C. Porco (b. 1954), planetary scientist at the University of Arizona. A pioneer in the study of planetary ring systems, Porco has made important contributions to our knowledge of spokes in Saturn's rings, eccentric ring features in the systems of Saturn and Uranus and the azimuthal structure in the rings of Neptune. Through her contributions to the Voyager project and as the team leader for the Cassini imaging system, Porco has been a leader in spacecraft exploration of the outer solar system. In 1997, she originated the idea of sending a capsule containing ashes of E. M. Shoemaker to the moon aboard the Lunar Prospector spacecraft. Name endorsed by the Shoemaker family.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19980808/MPCPages.arcLast Updated: 2009-11-17

Alternate Designations
 1985 TQ1 = 1974 TQ = 1983 EA2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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