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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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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 .3498819967984234 3.3496e-08  
a 2.339535659460681 7.1493e-09 au
q 1.520974251347462 7.7783e-08 au
i 21.74660853919413 4.4742e-06 deg
node 160.4578041932508 1.0888e-05 deg
peri 254.674653632933 1.2419e-05 deg
M 66.95707538575873 6.9673e-06 deg
tp 2458757.398910232028
(2019-Sep-30.89891023)
2.4905e-05 TDB
period 1307.052194443429
3.58
5.9913e-06
1.64e-08
d
yr
n .2754289396631907 1.2625e-09 deg/d
Q 3.1580970675739 9.6507e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1568  
   data-arc span      18320 days (50.16 yr)  
   first obs. used      1970-03-03  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45638  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:51:00  

Additional Information
 Earth MOID = .666177 au 
 Jupiter MOID = 2.64525 au 
 T_jup = 3.391 
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Orbital Elements at Epoch 2456953.5 (2014-Oct-23.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .34862459222329 3.3379e-08  
q 1.524343894452757 7.7417e-08 au
tp 2457448.599089767786
(2016-Mar-01.09908977)
2.3806e-05 TDB
node 160.6012662600081 1.0866e-05 deg
peri 254.3726779868878 1.2451e-05 deg
i 21.76588339314723 4.4765e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1568  
   data-arc span      18320 days (50.16 yr)  
   first obs. used      1970-03-03  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45638  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:51:00  

Additional Information
 Jupiter MOID = 2.64525 au 
 T_jup = 3.391 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.114133205465605E-15 -2.579526184121663E-15 1.620900256392983E-13 -6.571777544187842E-15 2.254450643582269E-14 -3.733245299625792E-16
q -2.579526184121663E-15 5.993338886251676E-15 -3.656552948232717E-13 1.511060491115405E-14 -5.270545396263343E-14 7.460414317288009E-16
tp 1.620900256392983E-13 -3.656552948232717E-13 5.667093526039394E-10 -6.690683046581126E-12 1.586328929979598E-10 -4.144483716636078E-12
node -6.571777544187842E-15 1.511060491115405E-14 -6.690683046581126E-12 1.18077197678468E-10 -1.10585612278513E-10 -3.882276654627645E-12
peri 2.254450643582269E-14 -5.270545396263343E-14 1.586328929979598E-10 -1.10585612278513E-10 1.550245864588165E-10 2.613851918892588E-12
i -3.733245299625792E-16 7.460414317288009E-16 -4.144483716636078E-12 -3.882276654627645E-12 2.613851918892588E-12 2.003920499489933E-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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