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7818 Muirhead (1990 QO)
Classification: Mars-crossing Asteroid          SPK-ID: 2007818
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .349882000980472 3.412e-08  
a 2.339535658476127 7.3961e-09 au
q 1.520974240923334 7.9492e-08 au
i 21.74660881111832 4.5025e-06 deg
node 160.4578029460167 1.1398e-05 deg
peri 254.67465462622 1.2874e-05 deg
M 66.95707623315532 7.2423e-06 deg
tp 2458757.398907308842
(2019-Sep-30.89890731)
2.5839e-05 TDB
period 1307.052193618352
3.58
6.1981e-06
1.697e-08
d
yr
n .275428939837055 1.3061e-09 deg/d
Q 3.158097076028921 9.9839e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1419  
   data-arc span      18234 days (49.92 yr)  
   first obs. used      1970-03-03  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47202  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:38:58  

Additional Information
 Earth MOID = .666177 au 
 Jupiter MOID = 2.64525 au 
 T_jup = 3.391 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456819.5 (2014-Jun-11.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3487265261814782 3.4002e-08  
q 1.523994460168868 7.9116e-08 au
tp 2457448.530296305349
(2016-Mar-01.03029631)
2.4391e-05 TDB
node 160.6066696072119 1.1376e-05 deg
peri 254.3691467812029 1.2902e-05 deg
i 21.7659785172912 4.5049e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1419  
   data-arc span      18234 days (49.92 yr)  
   first obs. used      1970-03-03  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47202  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:38:58  

Additional Information
 Jupiter MOID = 2.64525 au 
 T_jup = 3.391 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.156116296255688E-15 -2.685186073291915E-15 1.308564164259085E-13 -7.940573926505594E-15 2.039305082001105E-14 -1.290143552441356E-16
q -2.685186073291915E-15 6.259415630472987E-15 -2.861269289737812E-13 1.822693200040552E-14 -4.679397320388344E-14 9.705765333377811E-17
tp 1.308564164259085E-13 -2.861269289737812E-13 5.949226084477222E-10 -9.339419507303319E-12 1.646691529005817E-10 -4.630596049881217E-12
node -7.940573926505594E-15 1.822693200040552E-14 -9.339419507303319E-12 1.294220435586969E-10 -1.217455718812363E-10 -2.449803999809608E-12
peri 2.039305082001105E-14 -4.679397320388344E-14 1.646691529005817E-10 -1.217455718812363E-10 1.664620985111787E-10 1.206417955513722E-12
i -1.290143552441356E-16 9.705765333377811E-17 -4.630596049881217E-12 -2.449803999809608E-12 1.206417955513722E-12 2.029444250336665E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9   n/a MPO448991  
diameter diameter 3.907 km 0.593 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.297   0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

7818 Muirhead (1990 QO)          Discovered 1990-Aug-19 by Helin, E. F. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1990 QO = 1970 ET1 = 1988 DN5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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