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18401 (1992 WE4)
Classification: Main-belt Asteroid          SPK-ID: 2018401
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1862919853668434 5.0084e-08  
a 2.529420151030794 7.541e-09 au
q 2.058209449268366 1.2815e-07 au
i 16.48595853703769 4.9074e-06 deg
node 68.11617445507547 1.1267e-05 deg
peri 304.8971357619374 1.5764e-05 deg
M 24.73390705581717 9.4337e-06 deg
tp 2459099.546794874635
(2020-Sep-07.04679487)
3.8579e-05 TDB
period 1469.365667264603
4.02
6.5709e-06
1.799e-08
d
yr
n .2450036828954786 1.0956e-09 deg/d
Q 3.000630852793221 8.9458e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2127  
   data-arc span      10340 days (28.31 yr)  
   first obs. used      1992-11-17  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44673  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:28:33  

Additional Information
 Earth MOID = 1.10462 au 
 Jupiter MOID = 2.54333 au 
 T_jup = 3.371 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457635.5 (2016-Sep-04.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1883810112255169 5.0371e-08  
q 2.052608844805154 1.292e-07 au
tp 2457630.182791180158
(2016-Aug-29.68279118)
3.9702e-05 TDB
node 68.13497912469094 1.1263e-05 deg
peri 304.914129985667 1.5662e-05 deg
i 16.4935421518946 4.9124e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2127  
   data-arc span      10340 days (28.31 yr)  
   first obs. used      1992-11-17  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44673  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:28:33  

Additional Information
 Jupiter MOID = 2.54333 au 
 T_jup = 3.371 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.537219889533858E-15 -6.500845671260173E-15 1.393685012771384E-12 -6.701792694331277E-15 3.87528042544978E-13 -2.181525371402118E-14
q -6.500845671260173E-15 1.669224619199811E-14 -3.614962232329568E-12 1.653444188617337E-14 -1.003722700694492E-12 5.637511498889071E-14
tp 1.393685012771384E-12 -3.614962232329568E-12 1.5762506376655E-9 -1.893091635445962E-12 4.416374426384276E-10 -1.540166076281978E-11
node -6.701792694331277E-15 1.653444188617337E-14 -1.893091635445962E-12 1.26863478905895E-10 -1.21957023588267E-10 -3.07617153102874E-11
peri 3.87528042544978E-13 -1.003722700694492E-12 4.416374426384276E-10 -1.21957023588267E-10 2.452865515541509E-10 2.536975015052882E-11
i -2.181525371402118E-14 5.637511498889071E-14 -1.540166076281978E-11 -3.07617153102874E-11 2.536975015052882E-11 2.413190833507687E-11

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 14.21   n/a E2021B10  
diameter diameter 4.497 km 0.487 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.14 h n/a LCDB (Rev. 2020-October); 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:
[Oey, J.; Groom, R. (2019) Minor Planet Bull. 46, 119-125.]
geometric albedo albedo 0.241   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18401 (1992 WE4)          Discovered 1992-Nov-21 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1992 WE4 = 1999 JT127 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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