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27685 (1981 EE21)
Classification: Main-belt Asteroid          SPK-ID: 2027685
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1932500432439224 3.2983e-08  
a 2.724625835823938 9.544e-09 au
q 2.198091775227454 9.1989e-08 au
i 12.10196948336575 4.0339e-06 deg
node 181.2130959202355 1.5444e-05 deg
peri 213.3402792583004 1.8268e-05 deg
M 26.02073699703578 8.7882e-06 deg
tp 2458881.765801520462
(2020-Feb-02.26580152)
4.0008e-05 TDB
period 1642.70179808908
4.50
8.6313e-06
2.363e-08
d
yr
n .2191511572086793 1.1515e-09 deg/d
Q 3.251159896420422 1.1388e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1453  
   data-arc span      14237 days (38.98 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54189  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:08:40  

Additional Information
 Earth MOID = 1.21346 au 
 Jupiter MOID = 2.2273 au 
 T_jup = 3.298 
[ 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 14.3   n/a MPO358888  
diameter diameter 4.046 km 0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.247   0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27685 (1981 EE21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1919-Jan-21 00:15 00:02 Europ 0.0303104741546078 0.0303015594148826 0.0303193905378377 3.68482405872067 3.68482396355896 2421979.510273006 2.2581825895532 567.452133955068 38.3443337087784 -38.576348336619 73941.29639451 T 21 CATAB v2.0f-lin.ifort 2020-Feb-23 01:08:49 2020-Feb-23 01:08
2044-Jan-02 07:27 < 00:01 Hygie 0.0416706520076224 0.0416690765361067 0.0416722278914014 5.88049359912263 5.88049344144926 2467616.810334955 0.321116171218533 251.586616149155 39.533984706838 74.1607484699846 151717.063065436 T 21 CATAB v2.0f-lin.ifort 2020-Feb-23 01:08:49 2020-Feb-23 01:08
2046-Jul-31 21:29 < 00:01 Thisb 0.0259663012740717 0.0259594490374196 0.0259731537960603 6.35837407982473 6.35837403852772 2468558.395062918 0.433889926926721 367.820336441062 32.8786748309069 -21.8469956660983 45032.0633859587 T 21 CATAB v2.0f-lin.ifort 2020-Feb-23 01:08:49 2020-Feb-23 01:08

Alternate Designations
 1981 EE21 = 2000 LY32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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