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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09954494813701671 5.1802e-08  
a 2.74361088876803 1.3999e-08 au
q 2.470498285137462 1.4035e-07 au
i 10.68873423322985 5.7639e-06 deg
node 331.0997404340563 2.1106e-05 deg
peri 2.385659616185579 3.0392e-05 deg
M 80.08546208487815 2.0256e-05 deg
tp 2458631.239044984456
(2019-May-27.73904498)
9.3555e-05 TDB
period 1659.901064998622
4.54
1.2704e-05
3.478e-08
d
yr
n .2168803958206382 1.6599e-09 deg/d
Q 3.016723492398598 1.5393e-08 au
  Orbit Determination Parameters
   # obs. used (total)      947  
   data-arc span      21658 days (59.30 yr)  
   first obs. used      1960-10-17  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52999  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:08:42  

Additional Information
 Earth MOID = 1.4602 au 
 Jupiter MOID = 2.33245 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-August); 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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