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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 | Close-Approach Data ]

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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 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1331930104972913 2.6023e-08  
a 2.470074180505499 2.9343e-09 au
q 2.141077564252342 6.3983e-08 au
i 5.592938845737511 2.8318e-06 deg
node 125.5416498103649 2.5676e-05 deg
peri 135.833921541891 2.7163e-05 deg
M 95.98368090264805 9.748e-06 deg
tp 2458822.442097092177
(2019-Dec-04.94209709)
3.8122e-05 TDB
period 1417.958175461695
3.88
2.5267e-06
6.918e-09
d
yr
n .2538861908834386 4.5241e-10 deg/d
Q 2.799070796758657 3.3252e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3973  
   data-arc span      61635 days (168.75 yr)  
   first obs. used      1852-04-17  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54213  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:42:38  

Additional Information
 Earth MOID = 1.12793 au 
 Jupiter MOID = 2.27334 au 
 T_jup = 3.466 
[ hide covariance matrix ]
Orbital Elements at Epoch 2452941.5 (2003-Oct-29.0) TDB
Reference: JPL 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1340216880755173 2.6292e-08  
q 2.13911684318535 6.4739e-08 au
tp 2453148.865584688883
(2004-May-23.36558469)
3.4832e-05 TDB
node 125.6233030383417 2.5722e-05 deg
peri 135.8247492646067 2.7149e-05 deg
i 5.587100609209564 2.8316e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3973  
   data-arc span      61635 days (168.75 yr)  
   first obs. used      1852-04-17  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54213  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:42:38  

Additional Information
 Jupiter MOID = 2.27334 au 
 T_jup = 3.466 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.912812067386843E-16 -1.700847533396964E-15 1.593816942447699E-13 -6.260229424792576E-15 4.599319267326868E-14 -5.286341121391895E-16
q -1.700847533396964E-15 4.191097602382739E-15 -3.820732238824535E-13 1.453977887308781E-14 -1.101987200928862E-13 1.405050321009345E-15
tp 1.593816942447699E-13 -3.820732238824535E-13 1.213294688124153E-9 -4.908591791726947E-13 3.08955780444405E-10 -1.09643142905898E-12
node -6.260229424792576E-15 1.453977887308781E-14 -4.908591791726947E-13 6.616193843678296E-10 -6.583140289974903E-10 -1.56788121893681E-11
peri 4.599319267326868E-14 -1.101987200928862E-13 3.08955780444405E-10 -6.583140289974903E-10 7.370830321362588E-10 1.533007122697782E-11
i -5.286341121391895E-16 1.405050321009345E-15 -1.09643142905898E-12 -1.56788121893681E-11 1.533007122697782E-11 8.017786567963172E-12

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 7.78   n/a E2021B10 IRAS observations used: 10
diameter diameter 84.899 km 2.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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, http://obswww.unige.ch/~behrend/page_cou.html]
[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, http://obswww.unige.ch/~behrend/page_cou.html]
[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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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

[ show close-approach data ]
Alternate Designations
 A852 HA = 1954 SO1 = A913 CA = A916 YF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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