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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2379719784580902 4.0794e-08  
a 2.33085242543023 1.3354e-08 au
q 1.77617486225676 9.5497e-08 au
i 2.102376841786922 7.3318e-06 deg
node 3.617731973112538 0.00012618 deg
peri 276.3721979066839 0.00012729 deg
M 198.7498065642819 2.1765e-05 deg
tp 2459978.694819781571
(2023-Feb-03.19481978)
8.2006e-05 TDB
period 1299.782224477876
3.56
1.117e-05
3.058e-08
d
yr
n .2769694747476736 2.3803e-09 deg/d
Q 2.8855299886037 1.6532e-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 = .761068 au 
 Jupiter MOID = 2.26482 au 
 T_jup = 3.532 
[ 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 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

[ hide close-approach data ]
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
2000-Aug-18 10:52 < 00:01 Hebe 0.0229680690350548 0.0229655821172764 0.0229705559550289 8.28138509317739 8.28138506049377 2451774.952496296 0.34844134103809 124.663095662167 61.3504956056011 6.82169570172847 28158.9506245015 T 13 CATAB v2.0f-lin.ifort 2021-Apr-14 00:39:33 2021-Apr-14 00:39
2195-Jun-02 02:55 00:05 Inter 0.0300750860866049 0.0300436164662448 0.03010655632513 5.74149548308026 5.74149539830155 2522919.621288402 4.67372571618836 1583.25942210724 36.6090996797394 -7.80278653124815 16909.539134176 T 13 CATAB v2.0f-lin.ifort 2021-Apr-14 00:39:33 2021-Apr-14 00:39
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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