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118417 (1999 TW12)
Classification: Main-belt Asteroid          SPK-ID: 2118417
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2405829653975896 4.3968e-08  
a 3.106197926951304 2.2913e-08 au
q 2.358899618573513 1.3597e-07 au
i 17.21208998264233 5.4016e-06 deg
node 34.76273357341186 1.8197e-05 deg
peri 61.67960568903293 2.1013e-05 deg
M 262.9062014553382 1.1987e-05 deg
tp 2459739.800852074239
(2022-Jun-09.30085207)
6.9042e-05 TDB
period 1999.595336229642
5.47
2.2125e-05
6.057e-08
d
yr
n .180036427109698 1.992e-09 deg/d
Q 3.853496235329093 2.8425e-08 au
  Orbit Determination Parameters
   # obs. used (total)      820  
   data-arc span      7652 days (20.95 yr)  
   first obs. used      1999-10-04  
   last obs. used      2020-09-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53528  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 18:11:42  

Additional Information
 Earth MOID = 1.42708 au 
 Jupiter MOID = 1.79112 au 
 T_jup = 3.108 
[ 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 14.09   n/a E2021B55  
diameter diameter 3.921 km 1.164 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.355 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.347   0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

118417 (1999 TW12)          Discovered 1999-Oct-10 by Juels, C. W. at Fountain Hills
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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