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8995 Rachelstevenson (1981 EB9)
Classification: Main-belt Asteroid          SPK-ID: 2008995
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1694515392671691 2.8129e-08  
a 2.606216426459581 9.2017e-09 au
q 2.164589041332624 7.2898e-08 au
i 12.66667601297092 4.4392e-06 deg
node 342.1392221018751 1.2731e-05 deg
peri 308.768993044119 1.8738e-05 deg
M 16.67923343992781 1.3061e-05 deg
tp 2458929.298731700948
(2020-Mar-20.79873170)
5.5821e-05 TDB
period 1536.788646791045
4.21
8.1389e-06
2.228e-08
d
yr
n .2342547238045471 1.2406e-09 deg/d
Q 3.047843811586538 1.0761e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2411  
   data-arc span      24002 days (65.71 yr)  
   first obs. used      1955-02-13  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42251  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:16:54  

Additional Information
 Earth MOID = 1.1735 au 
 Jupiter MOID = 2.28036 au 
 T_jup = 3.358 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457318.5 (2015-Oct-23.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1685124110406567 2.8149e-08  
q 2.166729886796239 7.2956e-08 au
tp 2457393.869112759936
(2016-Jan-06.36911276)
5.8252e-05 TDB
node 342.1935159092953 1.2734e-05 deg
peri 309.003351619836 1.8791e-05 deg
i 12.6644516241205 4.4389e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2411  
   data-arc span      24002 days (65.71 yr)  
   first obs. used      1955-02-13  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42251  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:16:54  

Additional Information
 Jupiter MOID = 2.28036 au 
 T_jup = 3.358 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.923688291175985E-16 -2.042366955751515E-15 6.573004723525967E-13 7.531192654190156E-16 1.436699665981388E-13 1.876020660260735E-15
q -2.042366955751515E-15 5.322505222520511E-15 -1.860751126575916E-12 -1.341475645379607E-15 -4.090053045919834E-13 -4.668517174419705E-15
tp 6.573004723525967E-13 -1.860751126575916E-12 3.393291184753031E-9 -5.036570439921437E-12 8.10715060355367E-10 1.802106434899943E-12
node 7.531192654190156E-16 -1.341475645379607E-15 -5.036570439921437E-12 1.621509168549168E-10 -1.590493287166316E-10 1.326196361411365E-11
peri 1.436699665981388E-13 -4.090053045919834E-13 8.10715060355367E-10 -1.590493287166316E-10 3.531176578215277E-10 -1.255525939543915E-11
i 1.876020660260735E-15 -4.668517174419705E-15 1.802106434899943E-12 1.326196361411365E-11 -1.255525939543915E-11 1.970370913124434E-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 12.9   n/a MPO473888  

8995 Rachelstevenson           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring.
Rachel Stevenson (b. 1984) is a postdoctoral fellow at the Jet Propulsion Laboratory. She studies transient activity in comets through photometric analysis of inner coma images and through data provided by the Wide-Field Infrared Survey Explorer spacecraft.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-07-12Last Updated: 2014-08-13

[ show close-approach data ]
Alternate Designations
 1981 EB9 = 1978 TG1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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