+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   138 Tolosa (A874 KA) Classification: Main-belt Asteroid          SPK-ID: 2000138 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 79 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1625282513947619 2.1898e-08   a 2.448485021795055 5.2813e-09 au q 2.05053703263644 5.5274e-08 au i 3.202501187641573 6.4601e-07 deg node 54.73399824582683 4.3166e-06 deg peri 260.4787300049314 5.6058e-06 deg M 40.15638334464528 3.8362e-06 deg tp 2459044.402231355060 (2020-Jul-13.90223136) 1.4723e-05 TDB period 1399.408812040633 3.83 4.5277e-06 1.24e-08 d yr n .2572514885589752 8.3232e-10 deg/d Q 2.846433010953671 6.1397e-09 au   Orbit Determination Parameters    # obs. used (total)      3277      data-arc span      45192 days (123.73 yr)      first obs. used      1897-05-30      last obs. used      2021-02-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47593      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:54:56   Additional Information  Earth MOID = 1.03782 au   Jupiter MOID = 2.43208 au   T_jup = 3.477  [ 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 8.81   n/a E2020-QM5 IRAS observations used: 6 diameter diameter 52.905 km 1.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 10.101 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W. (1996) I.A.P.P.P. Comm. 65, 54-55.] [Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planet. Space Sci. 53, 1147-1165.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Mendez, O.; Scheck, J.; Sosa, N. (2011) http://www.fisica.edu.uy/oalm/aster/aster.html] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] geometric albedo albedo 0.273   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.877   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.42, mean=7.21, max.=9.52) deg. U-B UB 0.490   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.42, mean=7.21, max.=9.52) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 138 Tolosa (A874 KA)          Discovered 1874-May-19 by Perrotin, J. at Toulouse Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A874 KA = A909 SB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-May-16 10:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin