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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1399342775884508 1.7886e-08  
a 3.098400042779576 1.4042e-08 au
q 2.664827671113191 5.5663e-08 au
i .762380441970973 1.5972e-06 deg
node 42.91645972867086 8.1112e-05 deg
peri 154.3756572953966 8.1928e-05 deg
M 176.6798589792664 1.1291e-05 deg
tp 2458222.836942503522
(2018-Apr-14.33694250)
5.8659e-05 TDB
period 1992.070305761536
5.45
1.3542e-05
3.708e-08
d
yr
n .1807165133473429 1.2285e-09 deg/d
Q 3.531972414445961 1.6007e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2511  
   data-arc span      11317 days (30.98 yr)  
   first obs. used      1990-02-18  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49101  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:25:50  

Additional Information
 Earth MOID = 1.66239 au 
 Jupiter MOID = 1.42384 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 12.83   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

[ 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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