+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   253 Mathilde (A885 VA) Classification: Main-belt Asteroid          SPK-ID: 2000253 [ 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 218 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2632605127872869 2.0418e-08   a 2.649153178903038 4.6324e-09 au q 1.951735754572953 5.3038e-08 au i 6.739731153535466 3.1783e-06 deg node 179.5322956046401 1.8434e-05 deg peri 157.7430436413759 1.8766e-05 deg M 175.7631093618333 5.3006e-06 deg tp 2458431.574508141388 (2018-Nov-09.07450814) 2.223e-05 TDB period 1574.92193938855 4.31 4.131e-06 1.131e-08 d yr n .2285827576570346 5.9957e-10 deg/d Q 3.346570603233123 5.852e-09 au   Orbit Determination Parameters    # obs. used (total)      4324      # delay obs. used      1      # Doppler obs. used      0      data-arc span      49356 days (135.13 yr)      first obs. used      1885-12-01      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43982      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:44:50   Additional Information  Earth MOID = .942949 au   Jupiter MOID = 2.0758 au   T_jup = 3.331  [ 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 10.39   n/a E2021B10   diameter diameter 52.8 km n/a n/a Yeomans E-mail 2001-Apr-04 GM GM 0.00689 km^3/s^2 0.00030 Yeomans et al. (1997) Science v.278, pp.2106-2109   bulk density density 1.3 g/cm^3 0.2 Yeomans et al. (1997) Science v.278, pp.2106-2109 based on a nominal volume of 78000 km^3 (with lower/uppper limits of 67000/90000 km^3) rotation period rot_per 417.7 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Mottola, S.; Sears, W.D.; Erikson, A.; Harris, A.W.; et al. (1995) Planet. Space Sci. 43, 1609-1613.] [Pravec, P.; et al. (2005) Icarus 173, 108-131.] geometric albedo albedo 0.0436   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20 SMASSII spectral type spec_B Cb   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) 253 Mathilde (A885 VA)          Discovered 1885-Nov-12 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A885 VA = 1949 OL1 = A915 TN  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-01 01:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin