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30747 (1981 EM25)
Classification: Main-belt Asteroid          SPK-ID: 2030747
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1093714134402771 3.6938e-08  
a 2.363704683628229 8.4808e-09 au
q 2.105182961424406 8.8542e-08 au
i 3.395055810591278 4.4245e-06 deg
node 173.5364310155649 6.3729e-05 deg
peri 349.6859527577159 6.6475e-05 deg
M 350.4554109810987 1.9009e-05 deg
tp 2459235.691921687600
(2021-Jan-21.19192169)
7.0132e-05 TDB
period 1327.358546548976
3.63
7.1437e-06
1.956e-08
d
yr
n .2712153403735341 1.4597e-09 deg/d
Q 2.622226405832051 9.4084e-09 au
  Orbit Determination Parameters
   # obs. used (total)      842  
   data-arc span      14653 days (40.12 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54636  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:31:21  

Additional Information
 Earth MOID = 1.11265 au 
 Jupiter MOID = 2.35001 au 
 T_jup = 3.539 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.10   n/a MPCxxxxx  
diameter diameter 1.614 km 0.336 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.187   0.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30747 (1981 EM25)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EM25 = 1999 CP71 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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