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17 Thetis (A852 HA)
Classification: Main-belt Asteroid          SPK-ID: 2000017
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 118 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1331930525262716 1.2637e-08  
a 2.470074162338151 2.1141e-09 au
q 2.141077444690059 3.1424e-08 au
i 5.592933019254704 3.8877e-07 deg
node 125.5416225152801 3.727e-06 deg
peri 135.8339462094293 8.2978e-06 deg
M 95.98370394734634 6.5105e-06 deg
tp 2458822.442010495262
2.5627e-05 TDB
period 1417.958159818112
n .2538861936844307 3.2594e-10 deg/d
Q 2.799070879986242 2.3957e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4067  
   data-arc span      61671 days (168.85 yr)  
   first obs. used      1852-04-17  
   last obs. used      2021-02-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54215  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:43:50  

Additional Information
 Earth MOID = 1.12793 au 
 Jupiter MOID = 2.27334 au 
 T_jup = 3.466 
[ 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 7.78   n/a E2021B10 IRAS observations used: 10
diameter diameter 84.899 km 2.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.27048 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic)
Published Reference List:
[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.]
[Michalowski, T.; Velichko, F.P.; Di Martino, M.; Krugly, et al. (1995) Icarus 118, 292-301.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2007) Observatoire de Geneve web site,]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Behrend, R. (2011) Observatoire de Geneve web site,]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.193   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.829   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=25; phase (min.=.64, mean=7.44, max.=23.88) deg.
U-B UB 0.438   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=23; phase (min.=.64, mean=7.45, max.=23.88) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sl   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)

17 Thetis (A852 HA)          Discovered 1852-Apr-17 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A852 HA = 1954 SO1 = A913 CA = A916 YF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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