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30742 (1981 EG17)
Classification: Main-belt Asteroid          SPK-ID: 2030742
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .198194724765537 3.0266e-08  
a 3.13594746886381 1.8032e-08 au
q 2.514419223393165 9.3603e-08 au
i 21.60909508724376 4.6743e-06 deg
node 181.7669487230909 9.9999e-06 deg
peri 302.7626512672934 1.5885e-05 deg
M 94.23689808725608 1.1567e-05 deg
tp 2458669.529886123062
(2019-Jul-05.02988612)
6.4935e-05 TDB
period 2028.390629100593
5.55
1.7495e-05
4.79e-08
d
yr
n .1774806069576585 1.5308e-09 deg/d
Q 3.757475714334455 2.1606e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1368  
   data-arc span      14357 days (39.31 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-05-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50772  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:39:35  

Additional Information
 Earth MOID = 1.59104 au 
 Jupiter MOID = 1.52404 au 
 T_jup = 3.074 
[ show covariance matrix ]

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 13.96   n/a E2021B10  
diameter diameter 8.650 km 0.183 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.086   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30742 (1981 EG17)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EG17 = 1998 FQ144 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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