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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1398849129895073 3.6792e-08  
a 3.098747467160229 1.593e-08 au
q 2.665279447340064 1.1071e-07 au
i .7623639148278007 3.7489e-06 deg
node 42.91846786703475 0.00031255 deg
peri 154.459209367821 0.00031286 deg
M 140.4305153816147 1.4409e-05 deg
tp 2458223.293018712170
(2018-Apr-14.79301871)
7.8148e-05 TDB
period 1992.405372174898
5.45
1.5364e-05
4.206e-08
d
yr
n .1806861219245892 1.3933e-09 deg/d
Q 3.532215486980393 1.8158e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2094  
   data-arc span      10845 days (29.69 yr)  
   first obs. used      1990-02-18  
   last obs. used      2019-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51059  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:37:26  

Additional Information
 Earth MOID = 1.66355 au 
 Jupiter MOID = 1.42472 au 
 T_jup = 3.207 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456196.5 (2012-Sep-26.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1370831999131205 3.7001e-08  
q 2.676778994467718 1.1117e-07 au
tp 2456230.323654832226
(2012-Oct-29.82365483)
7.7955e-05 TDB
node 43.03569246276481 0.00031095 deg
peri 155.1088248974375 0.00031127 deg
i .7653368987983838 3.7506e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2094  
   data-arc span      10845 days (29.69 yr)  
   first obs. used      1990-02-18  
   last obs. used      2019-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51059  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:37:26  

Additional Information
 Jupiter MOID = 1.42472 au 
 T_jup = 3.207 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.369097951731524E-15 -4.08431328068869E-15 -5.166744274319414E-13 -4.372987645440324E-16 -9.944001788472747E-14 -1.817772519670376E-17
q -4.08431328068869E-15 1.235776592716888E-14 1.601480275294601E-12 -1.577871200877272E-15 3.09947502184292E-13 6.099267188054983E-17
tp -5.166744274319414E-13 1.601480275294601E-12 6.077002044370013E-9 6.915668510583833E-12 1.118106535801457E-9 -2.951293644729358E-15
node -4.372987645440324E-16 -1.577871200877272E-15 6.915668510583833E-12 9.669172681849703E-8 -9.668180999113145E-8 -1.480881703813477E-10
peri -9.944001788472747E-14 3.09947502184292E-13 1.118106535801457E-9 -9.668180999113145E-8 9.688830657887101E-8 1.48075629813289E-10
i -1.817772519670376E-17 6.099267188054983E-17 -2.951293644729358E-15 -1.480881703813477E-10 1.48075629813289E-10 1.406693731933717E-11

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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