+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   279 Thule (A888 UA) Classification: Outer Main-belt Asteroid          SPK-ID: 2000279 [ 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 52 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04251975253686419 2.9366e-08   a 4.272880795544239 2.8391e-08 au q 4.091198961498178 1.4183e-07 au i 2.334380351725212 3.0247e-06 deg node 71.91999837044166 9.612e-05 deg peri 24.48354706572343 0.00010549 deg M 235.0557985325701 4.5999e-05 deg tp 2460120.178135173794 (2023-Jun-24.67813517) 0.00041852 TDB period 3226.113128328253 8.83 3.2154e-05 8.803e-08 d yr n .1115893912209301 1.1122e-09 deg/d Q 4.454562629590299 2.9598e-08 au   Orbit Determination Parameters    # obs. used (total)      3369      data-arc span      47450 days (129.91 yr)      first obs. used      1890-12-12      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43583      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:52:21   Additional Information  Earth MOID = 3.10819 au   Jupiter MOID = .64929 au   T_jup = 3.027  [ 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 8.5   n/a MPO492751 IRAS observations used: 9 diameter diameter 126.59 km 3.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9 rotation period rot_per 23.896 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Bartczak, P.; et al. (2016) Proc. Polish Ast. Soc. 123, 51-57.] geometric albedo albedo 0.0412   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9 B-V BV 0.746   0.049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=7.15, mean=11.21, max.=13.24) deg. U-B UB 0.232   0.044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=9.92, mean=12.02, max.=13.24) deg. Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B X   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) 279 Thule (A888 UA)          Discovered 1888-Oct-25 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A888 UA = 1927 EC = 1954 FF = A920 GA = A923 RA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-28 03:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin