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12561 Howard (1998 SX7)
Classification: Main-belt Asteroid          SPK-ID: 2012561
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1399083028797285 1.7881e-08  
a 3.098571027107329 1.3967e-08 au
q 2.665055213352445 5.5646e-08 au
i .7624000635254022 1.597e-06 deg
node 42.91587497268313 8.1094e-05 deg
peri 154.3141994487942 8.191e-05 deg
M 212.1791378974077 1.1441e-05 deg
tp 2460214.538682307909
(2023-Sep-27.03868231)
6.6904e-05 TDB
period 1992.235205788877
5.45
1.347e-05
3.688e-08
d
yr
n .1807015551948589 1.2218e-09 deg/d
Q 3.532086840862213 1.5921e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2541  
   data-arc span      11472 days (31.41 yr)  
   first obs. used      1990-02-18  
   last obs. used      2021-07-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49081  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 13:25:50  

Additional Information
 Earth MOID = 1.66411 au 
 Jupiter MOID = 1.42273 au 
 T_jup = 3.207 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456910.5 (2014-Sep-10.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1376426657601001 1.8063e-08  
q 2.675712318494277 5.6257e-08 au
tp 2456230.296804472958
(2012-Oct-29.79680447)
5.3103e-05 TDB
node 43.02248760822316 8.0759e-05 deg
peri 155.0720307871471 8.1625e-05 deg
i .7650178104356355 1.5976e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2541  
   data-arc span      11472 days (31.41 yr)  
   first obs. used      1990-02-18  
   last obs. used      2021-07-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49081  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 13:25:50  

Additional Information
 Jupiter MOID = 1.42273 au 
 T_jup = 3.207 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.262866313586474E-16 -9.92199162838684E-16 1.411517737452188E-13 4.31130358739336E-13 -4.120823124582883E-13 -1.277767879760871E-14
q -9.92199162838684E-16 3.1647981131473E-15 -2.249218920855037E-13 -1.277211607145377E-12 1.259859071070194E-12 3.810484637575521E-14
tp 1.411517737452188E-13 -2.249218920855037E-13 2.819937622434858E-9 -1.58911980091351E-10 5.868370566098161E-10 2.843782185218222E-12
node 4.31130358739336E-13 -1.277211607145377E-12 -1.58911980091351E-10 6.521964646634534E-9 -6.55907996151651E-9 -6.556605179901377E-11
peri -4.120823124582883E-13 1.259859071070194E-12 5.868370566098161E-10 -6.55907996151651E-9 6.662635655537483E-9 6.582709801350005E-11
i -1.277767879760871E-14 3.810484637575521E-14 2.843782185218222E-12 -6.556605179901377E-11 6.582709801350005E-11 2.55248080677256E-12

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 12.83   n/a E2021B10  

12561 Howard           Discovered 1998 Sept. 20 by Spacewatch at Kitt Peak.
Ron Howard (b. 1954) is a noted director of such films as Apollo 13 and A Beautiful Mind. He began his career as a child star in The Andy Griffith Show, later starring in the long-running TV series Happy Days before beginning his career as a director.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030318/MPCPages.arcLast Updated: 2003-10-02

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Alternate Designations
 1998 SX7 = 1990 DT7 = 1991 MB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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