+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 57 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04316723868878847 1.9462e-08   a 4.269397785077421 2.0679e-08 au q 4.0850996718316 8.989e-08 au i 2.334314280784432 6.5415e-07 deg node 71.90014584177378 2.4376e-05 deg peri 25.32113240259467 3.5166e-05 deg M 256.6046621755577 1.9042e-05 deg tp 2460125.936902419993 (2023-Jun-30.43690242) 0.00017309 TDB period 3222.169315185894 8.82 2.341e-05 6.409e-08 d yr n .1117259724072665 8.1174e-10 deg/d Q 4.453695898323243 2.1572e-08 au   Orbit Determination Parameters    # obs. used (total)      3533      data-arc span      47521 days (130.11 yr)      first obs. used      1890-12-12      last obs. used      2021-01-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42983      source      ORB      producer      Otto Matic      solution date      2021-May-03 18:10:21   Additional Information  Earth MOID = 3.10191 au   Jupiter MOID = .648552 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 8.53   n/a E2021B10 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-May-14 02:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin