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4085 Weir (1985 JR)
Classification: Main-belt Asteroid          SPK-ID: 2004085
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1074445412496437 4.7015e-08  
a 2.605525675013507 1.2643e-08 au
q 2.325576164147513 1.2618e-07 au
i 14.21711248103314 4.7029e-06 deg
node 68.66556779532741 1.7447e-05 deg
peri 135.8609969172814 2.6818e-05 deg
M 136.3163422324368 2.1842e-05 deg
tp 2458418.816310989892
(2018-Oct-27.31631099)
9.1994e-05 TDB
period 1536.177721718607
4.21
1.1182e-05
3.061e-08
d
yr
n .2343478849551652 1.7058e-09 deg/d
Q 2.885475185879502 1.4002e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2126  
   data-arc span      14058 days (38.49 yr)  
   first obs. used      1981-05-05  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39652  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:03:47  

Additional Information
 Earth MOID = 1.33827 au 
 Jupiter MOID = 2.13819 au 
 T_jup = 3.361 
[ 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 12.2   n/a MPO435737  
diameter diameter 9.221 km 0.241 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 14.602 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:
[Warner, B.D. (2006) Minor Planet Bull. 33, 85-88.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.273   0.060 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4085 Weir (1985 JR)          Discovered 1985-May-13 by Shoemaker, C. S. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1985 JR = 1981 JY = 1982 XK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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