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227381 (2005 US256)
Classification: Main-belt Asteroid          SPK-ID: 2227381
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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2381231769272642 4.0792e-08  
a 2.330543064589206 1.333e-08 au
q 1.775586746083422 9.5474e-08 au
i 2.102377968973649 7.3318e-06 deg
node 3.62155581024101 0.00012619 deg
peri 276.3480213641716 0.00012731 deg
M 144.4881347618739 2.1445e-05 deg
tp 2458678.928551701206
(2019-Jul-14.42855170)
7.455e-05 TDB
period 1299.523463964817
3.56
1.1149e-05
3.052e-08
d
yr
n .2770246247818012 2.3767e-09 deg/d
Q 2.885499383094991 1.6504e-08 au
  Orbit Determination Parameters
   # obs. used (total)      276  
   data-arc span      8124 days (22.24 yr)  
   first obs. used      1998-09-19  
   last obs. used      2020-12-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5804  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:39:32  

Additional Information
 Earth MOID = .758822 au 
 Jupiter MOID = 2.26589 au 
 T_jup = 3.532 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456745.5 (2014-Mar-29.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2379769248733904 4.0825e-08  
q 1.776972382157585 9.5635e-08 au
tp 2457378.815844872106
(2015-Dec-22.31584487)
6.8387e-05 TDB
node 3.746324784397222 0.00012634 deg
peri 275.9984857786667 0.00012744 deg
i 2.101440839912433 7.3246e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      276  
   data-arc span      8124 days (22.24 yr)  
   first obs. used      1998-09-19  
   last obs. used      2020-12-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5804  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:39:32  

Additional Information
 Jupiter MOID = 2.26589 au 
 T_jup = 3.532 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.666715001900302E-15 -3.881293850403778E-15 3.410780567711818E-13 -1.17256364390172E-14 6.676301289809008E-14 -8.636155698884193E-16
q -3.881293850403778E-15 9.145971924691263E-15 -4.126406629100818E-13 3.415025030376819E-14 -7.844726475957888E-14 1.726065486886955E-15
tp 3.410780567711818E-13 -4.126406629100818E-13 4.676752426516992E-9 5.588444780178149E-11 1.153137460403487E-9 -2.632735184099952E-12
node -1.17256364390172E-14 3.415025030376819E-14 5.588444780178149E-11 1.596143285927299E-8 -1.593564277535479E-8 4.562051772162611E-11
peri 6.676301289809008E-14 -7.844726475957888E-14 1.153137460403487E-9 -1.593564277535479E-8 1.624170435995478E-8 -4.628468195848212E-11
i -8.636155698884193E-16 1.726065486886955E-15 -2.632735184099952E-12 4.562051772162611E-11 -4.628468195848212E-11 5.36496864589393E-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 17.63   n/a MPCxxxxx  
rotation period rot_per 2.83 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:
[Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) Ap. J. Supp. Ser. 241, A6.]

227381 (2005 US256)          Discovered 2005-Oct-25 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20091202/Numbers.arcLast Updated: 2009-12-04

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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