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21168 (1994 AC8)
Classification: Main-belt Asteroid          SPK-ID: 2021168
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1285265539558293 2.5504e-08  
a 2.235634338423086 5.8408e-09 au
q 1.948295961000246 5.7373e-08 au
i 4.39630987881016 3.2098e-06 deg
node 96.76899864434937 4.0804e-05 deg
peri 129.2801581139611 4.3245e-05 deg
M 291.0427720669104 1.3459e-05 deg
tp 2459434.371272187840
(2021-Aug-07.87127219)
4.5583e-05 TDB
period 1220.95479344554
3.34
4.7848e-06
1.31e-08
d
yr
n .2948512114720304 1.1555e-09 deg/d
Q 2.522972715845926 6.5915e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1492  
   data-arc span      9929 days (27.18 yr)  
   first obs. used      1994-01-07  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50746  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:40:50  

Additional Information
 Earth MOID = .940734 au 
 Jupiter MOID = 2.45951 au 
 T_jup = 3.624 
[ 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 15.2   n/a MPO431744  
diameter diameter 2.474 km 0.592 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.00 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.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.316   0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21168 (1994 AC8)          Discovered 1994-Jan-07 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1994 AC8 = 1999 TM180 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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