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27697 (1981 EM45)
Classification: Main-belt Asteroid          SPK-ID: 2027697
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09942670702727634 5.1933e-08  
a 2.742941606822272 1.4079e-08 au
q 2.470219955287827 1.4071e-07 au
i 10.68922323553278 5.801e-06 deg
node 331.1055772492202 2.1114e-05 deg
peri 2.225789567279216 3.0416e-05 deg
M 353.4586028237503 2.0335e-05 deg
tp 2458630.650275755245
(2019-May-27.15027576)
9.3712e-05 TDB
period 1659.293722646433
4.54
1.2775e-05
3.498e-08
d
yr
n .216959779384828 1.6704e-09 deg/d
Q 3.015663258356716 1.5478e-08 au
  Orbit Determination Parameters
   # obs. used (total)      932  
   data-arc span      21592 days (59.12 yr)  
   first obs. used      1960-10-17  
   last obs. used      2019-11-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52607  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 01:40:38  

Additional Information
 Earth MOID = 1.45898 au 
 Jupiter MOID = 2.33018 au 
 T_jup = 3.317 
[ 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 14.9   n/a MPO449166  
diameter diameter 3.034 km 0.195 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.890 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.231   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27697 (1981 EM45)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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