Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
24 Themis (A853 GA)
Classification: Main-belt Asteroid          SPK-ID: 2000024
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1244218945633696 2.7799e-08  
a 3.135384856833177 6.7461e-09 au
q 2.745274332760694 8.7456e-08 au
i .7516513834945131 3.0433e-06 deg
node 35.9203917228736 0.00023361 deg
peri 106.9819100977671 0.00023393 deg
M 66.20951499113049 1.3106e-05 deg
tp 2458627.548277474708
(2019-May-24.04827747)
7.3278e-05 TDB
period 2027.844791297613
5.55
6.5447e-06
1.792e-08
d
yr
n .177528379659489 5.7296e-10 deg/d
Q 3.525495380905661 7.5855e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3892  
   data-arc span      60996 days (167.00 yr)  
   first obs. used      1853-04-27  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51161  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:56:34  

Additional Information
 Earth MOID = 1.75798 au 
 Jupiter MOID = 1.48763 au 
 T_jup = 3.200 
[ 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 7.3   n/a MPO473760  
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. 2019-August); 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 Bull. 34, 59-64.]
[Higley, S.; Hardersen, P.; Dyvig, R. (2008) Minor Planet Bull. 35, 63-66.]
[Pilcher, F. (2012) http://aslc-nm.org/Pilcher.html]
[Pilcher, F. (2013) Minor Planet Bull. 40, 85-87.]
[Pilcher, F. (2014) Minor Planet Bull. 41, 250-252.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.]
geometric albedo albedo 0.067   n/a J.G. Williams (E-mail September 1990) IRTF
B-V BV 0.684   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=10; phase (min.=.16, mean=9.29, max.=18.36) deg.
U-B UB 0.336   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A853 GA)          Discovered 1853-Apr-05 by De Gasparis, A. at Naples
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A853 GA = 1947 BA = 1955 OH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Aug-09 00:28 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin