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266901 (2009 WL121)
Classification: Main-belt Asteroid          SPK-ID: 2266901
[ 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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0355841894142492 4.6659e-08  
a 2.939610183048262 2.7217e-08 au
q 2.835006537490617 1.3755e-07 au
i 1.140572031624903 5.3831e-06 deg
node 273.449520633527 0.00024528 deg
peri 38.78482771020356 0.00025771 deg
M 178.0069465974487 8.0999e-05 deg
tp 2458290.235739426173
(2018-Jun-20.73573943)		 0.00041199 TDB
period 1840.912054671885
5.04		 2.5566e-05
7e-08		 d
yr
n .1955552407223302 2.7159e-09 deg/d
Q 3.044213828605907 2.8185e-08 au
   Orbit Determination Parameters
   # obs. used (total)      268  
   data-arc span      8156 days (22.33 yr)  
   first obs. used      1998-09-20  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60182  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 14:15:21  

Additional Information
 Earth MOID = 1.8187 au 
 Jupiter MOID = 2.05112 au 
 T_jup = 3.272 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457515.5 (2016-May-07.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03655857724153573 4.6957e-08  
q 2.833362201696493 1.3895e-07 au
tp 2458271.939110128489
(2018-Jun-02.43911013)		 0.0004001 TDB
node 273.812775770915 0.00024572 deg
peri 34.80219944276664 0.00025737 deg
i 1.139146122269312 5.3788e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      268  
   data-arc span      8156 days (22.33 yr)  
   first obs. used      1998-09-20  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60182  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 14:15:21  

Additional Information
 Jupiter MOID = 2.05112 au 
 T_jup = 3.272 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.204938946025446E-15 -6.406814905316356E-15 8.831462230603115E-13 4.940670043957055E-15 1.025831317415132E-13 1.140352250928118E-17
q -6.406814905316356E-15 1.9308165913041E-14 -5.458695274459956E-13 -7.422171112440133E-15 2.763595818334749E-14 -1.225289844201471E-16
tp 8.831462230603115E-13 -5.458695274459956E-13 1.60076997776799E-7 -6.893082839884863E-11 3.06432157329582E-8 2.98760168389019E-13
node 4.940670043957055E-15 -7.422171112440133E-15 -6.893082839884863E-11 6.037753549361997E-8 -6.037937752663359E-8 -7.309693898633129E-11
peri 1.025831317415132E-13 2.763595818334749E-14 3.06432157329582E-8 -6.037937752663359E-8 6.624001608380536E-8 7.313671855112389E-11
i 1.140352250928118E-17 -1.225289844201471E-16 2.98760168389019E-13 -7.309693898633129E-11 7.313671855112389E-11 2.893146958714121E-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 16.2   n/a MPO454984  

266901 (2009 WL121)          Discovered 2009-Nov-20 by Spacewatch at Kitt Peak
Reference: 20110218/Numbers.arcLast Updated: 2011-02-22

[ 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
2023-Jan-25 01:46 00:02 Hygie 0.0332113605003068 0.0332068257404376 0.0332158959029209 1.98541020331194 1.98540961735518 2459969.573770429 1.864961814693 336.272893147142 89.9002676254212 -50.4778977358402 43341.5978257057 T 16 CATAB v2.0f-lin.ifort 2021-Feb-24 14:15:22 2021-Feb-24 14:15
2068-Jan-25 02:54 00:18 Iris 0.0424973427783644 0.0424833013885364 0.0425113912257717 2.78492496132609 2.78492491275277 2476405.620825742 17.6516761924345 1116.03330259526 86.4322675682908 -51.3857102823493 57518.054630803 T 16 CATAB v2.0f-lin.ifort 2021-Feb-24 14:15:22 2021-Feb-24 14:15
2101-Sep-06 15:25 00:03 Psych 0.0428983561907414 0.042852105852996 0.0429446098500157 2.67245916190319 2.672459056367 2488683.142459026 3.34322281241127 2378.70794220213 84.8200647257564 14.5440680903921 19139.0013069346 T 16 CATAB v2.0f-lin.ifort 2021-Feb-24 14:15:22 2021-Feb-24 14:15

Alternate Designations
 2009 WL121 = 2006 BX252 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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