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8988 (1979 MA4)
Classification: Outer Main-belt Asteroid          SPK-ID: 2008988
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2131513054743735 3.2613e-08  
a 3.399951985497714 1.7949e-08 au
q 2.675247781238688 1.1426e-07 au
i 4.158166054676735 3.9393e-06 deg
node 187.4898818923871 4.936e-05 deg
peri 146.5510471468941 5.0032e-05 deg
M 139.849232020059 9.8505e-06 deg
tp 2458110.960602213899
(2017-Dec-23.46060221)
5.8861e-05 TDB
period 2289.852997956142
6.27
1.8133e-05
4.965e-08
d
yr
n .1572153323035696 1.245e-09 deg/d
Q 4.124656189756739 2.1775e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2401  
   data-arc span      23713 days (64.92 yr)  
   first obs. used      1955-11-19  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46824  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:16:58  

Additional Information
 Earth MOID = 1.66666 au 
 Jupiter MOID = 1.297 au 
 T_jup = 3.106 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456545.5 (2013-Sep-10.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2040275573478322 3.239e-08  
q 2.724359878489252 1.1324e-07 au
tp 2455808.630385409059
(2011-Sep-04.13038541)
5.7767e-05 TDB
node 188.0977278137679 4.9863e-05 deg
peri 145.7762630703375 5.0629e-05 deg
i 4.122249013595757 3.9125e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2401  
   data-arc span      23713 days (64.92 yr)  
   first obs. used      1955-11-19  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46824  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:16:58  

Additional Information
 Jupiter MOID = 1.297 au 
 T_jup = 3.106 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.049081194868344E-15 -3.638388046437895E-15 3.174571392955051E-13 1.828817417629185E-14 1.362042284968741E-14 1.436457200011116E-15
q -3.638388046437895E-15 1.282301191883615E-14 -1.058391870060354E-12 -7.086392077145111E-14 -2.715364923520257E-14 -5.860333270901964E-15
tp 3.174571392955051E-13 -1.058391870060354E-12 3.337032272380199E-9 1.512587871894007E-12 5.247506612177278E-10 -2.068996003012951E-12
node 1.828817417629185E-14 -7.086392077145111E-14 1.512587871894007E-12 2.486339910477652E-9 -2.479679477627341E-9 1.978435642346256E-13
peri 1.362042284968741E-14 -2.715364923520257E-14 5.247506612177278E-10 -2.479679477627341E-9 2.563340061492966E-9 -3.499663410674007E-13
i 1.436457200011116E-15 -5.860333270901964E-15 -2.068996003012951E-12 1.978435642346256E-13 -3.499663410674007E-13 1.530746637579445E-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 12.5   n/a MPO337333  
diameter diameter 15.643 km 0.338 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.087   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8988 (1979 MA4)          Discovered 1979-Jun-25 by Helin, E. F., Bus, S. J. at Siding Spring
Reference: 19980808/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1979 MA4 = 1942 VA = 1986 TJ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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