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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1398848956096401 3.664e-08  
a 3.098747471256026 1.489e-08 au
q 2.665279504718741 1.1057e-07 au
i .7623644707914171 3.5738e-06 deg
node 42.91805580104475 0.00028377 deg
peri 154.459613407367 0.00028403 deg
M 140.430524864612 1.3692e-05 deg
tp 2458223.292964687986
(2018-Apr-14.79296469)
7.3348e-05 TDB
period 1992.405376125117
5.45
1.4361e-05
3.932e-08
d
yr
n .1806861215663539 1.3023e-09 deg/d
Q 3.532215437793312 1.6973e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2409  
   data-arc span      11220 days (30.72 yr)  
   first obs. used      1990-02-18  
   last obs. used      2020-11-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49455  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:49:42  

Additional Information
 Earth MOID = 1.66355 au 
 Jupiter MOID = 1.42472 au 
 T_jup = 3.207 
[ 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 12.8   n/a MPO350902  

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

[ show close-approach data ]
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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