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17 Thetis
Classification: Main-belt Asteroid          SPK-ID: 2000017
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1324921468461284 2.344e-08  
a 2.47195310248914 3.419e-09 AU
q 2.144438729037406 5.7565e-08 AU
i 5.590860758628849 2.6551e-06 deg
node 125.568989409956 2.4376e-05 deg
peri 135.8048307674231 2.5455e-05 deg
M 257.749976661254 7.9934e-06 deg
tp 2457403.699219366749
(2016-Jan-16.19921937)
3.1788e-05 JED
period 1419.576389642024
3.89
2.9452e-06
8.064e-09
d
yr
n .2535967790298215 5.2614e-10 deg/d
Q 2.799467475940874 3.872e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2636  
   data-arc span      59359 days (162.52 yr)  
   first obs. used      1852-04-23  
   last obs. used      2014-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61762  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:40:28  

Additional Information
 Earth MOID = 1.13453 AU 
 T_jup = 3.465 
[ 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 7.76 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10
diameter diameter 90.04 km 3.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10
rotation period rot_per 12.27048 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.1715   0.015 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10
B-V BV .829 mag .022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=25; phase (min.=.64, mean=7.44, max.=23.88) deg.
U-B UB .438 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1852-Apr-17 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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