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24 Themis
Classification: Main-belt Asteroid          SPK-ID: 2000024
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .125668713773715 2.5681e-08  
a 3.136106936299914 7.759e-09 au
q 2.741996411358278 8.0982e-08 au
i .7521882086150166 2.9311e-06 deg
node 35.92028658896826 0.00022598 deg
peri 106.836157279083 0.0002263 deg
M 142.5147476245595 1.1886e-05 deg
tp 2456597.451031295560
(2013-Oct-31.95103130)
6.5552e-05 JED
period 2028.545350935866
5.55
7.5282e-06
2.061e-08
d
yr
n .1774670701021866 6.586e-10 deg/d
Q 3.53021746124155 8.734e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2307  
   data-arc span      59318 days (162.40 yr)  
   first obs. used      1853-04-27  
   last obs. used      2015-09-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .64965  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Oct-05 13:01:27  

Additional Information
 Earth MOID = 1.75484 au 
 Jupiter MOID = 1.48933 au 
 T_jup = 3.199 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.08 mag n/a PDS3 (MPC 17257)  
magnitude slope G 0.19   n/a PDS3 (MPC 17257) Fit
diameter diameter 198 km n/a J.G. Williams (E-mail September 1990) based on IRTF albedo of 0.067
rotation period rot_per 8.374 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Published Reference List:
[Tedesco, E.F. (1979) PhD Dissertation, New. Mex. State Univ. 280pp.]
[Van Houten-Groeneveld, I.; van Houten, C.J.; Zappala, V. (1979) Astron. Astrophys. Suppl. Ser. 35, 223-232.]
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Harris, A.W.; Young, J.W.; Bowell, E.; Martin, L.J.; et al. (1989) Icarus 77, 171-186.]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.]
[Ditteon, R.; Hawkins, S. (2007) Minor Planet Bul. 34, 59-64.]
[Higley, S.; Hardersen, P.; Dyvig, R. (2008) Minor Planet Bul. 35, 63-66.]
[Pilcher, F. (2012) http://aslc-nm.org/Pilcher.html]
[Pilcher, F. (2013) Minor Planet Bul. 40, 85-87.]
[Pilcher, F. (2014) Minor Planet Bul. 41, 250-252.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2015) Astron. Astrophys., in press.arXiv:1510.07422]
geometric albedo albedo 0.067   n/a J.G. Williams (E-mail September 1990) IRTF
B-V BV .684 mag .030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=10; phase (min.=.16, mean=9.29, max.=18.36) deg.
U-B UB .336 mag .024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=8; phase (min.=.16, mean=8.75, max.=18.36) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

24 Themis          Discovered 1853-Apr-05 by De Gasparis, A. at Naples
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1947 BA = 1955 OH 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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