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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1074285613447125 1.8722e-08  
a 2.605436813067386 1.0281e-08 au
q 2.325538484565004 4.9162e-08 au
i 14.21708364621717 5.137e-07 deg
node 68.66546338514189 2.4179e-06 deg
peri 135.7857959239828 1.2967e-05 deg
M 183.2798812936368 1.3125e-05 deg
tp 2459954.554504087492
(2023-Jan-10.05450409)
5.8486e-05 TDB
period 1536.099134940897
4.21
9.0922e-06
2.489e-08
d
yr
n .2343598741847163 1.3872e-09 deg/d
Q 2.885335141569768 1.1386e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2776  
   data-arc span      14564 days (39.87 yr)  
   first obs. used      1981-05-05  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36723  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:23:47  

Additional Information
 Earth MOID = 1.33726 au 
 Jupiter MOID = 2.13728 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 12.28   n/a MPCxxxxx  
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. 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:
[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.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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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