+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1980 Tezcatlipoca (1950 LA) Classification: Amor [NEO]          SPK-ID: 2001980 [ 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 541 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3646327013509846 2.4758e-08   a 1.709606148789928 1.9684e-09 au q 1.086227840510403 4.2246e-08 au i 26.86615506368015 4.9621e-06 deg node 246.5682164147284 7.1195e-06 deg peri 115.4512228937866 9.6393e-06 deg M 137.7723057275943 7.6218e-06 deg tp 2458888.034581568712 (2020-Feb-08.53458157) 1.689e-05 TDB period 816.4743272691964 2.24 1.4101e-06 3.861e-09 d yr n .4409201710041104 7.6149e-10 deg/d Q 2.332984457069453 2.6861e-09 au   Orbit Determination Parameters    # obs. used (total)      3540      data-arc span      25820 days (70.69 yr)      first obs. used      1950-06-19      last obs. used      2021-02-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .32499      source      ORB      producer      Otto Matic      solution date      2021-Feb-27 05:51:21   Additional Information  Earth MOID = .245238 au   Jupiter MOID = 3.41157 au   T_jup = 3.996  [ 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 13.8   n/a MPO473791   diameter diameter 4.3 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   rotation period rot_per 7.24612 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.] [Kaasalainen, M.; et al. (2004) Icarus 167, 178-196.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2015) Icarus 256, 101-116.] [Warner, B.D. (2015) Minor Planet Bull. 42, 256-266.] [Warner, B.D. (2017) Minor Planet Bull. 44, 335-344.] [Aznar, A.M.; Predatu, M.; Vaduvescu, O.; Oey, J. (2018) arXiv:1801.09420. Romanian J. Phys. 62, 904 (2017).] geometric albedo albedo 0.25   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   B-V BV 0.955   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=53.35, mean=53.35, max.=53.36) deg. U-B UB 0.455   0.060 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=53.35, mean=53.35, max.=53.36) deg. Tholen spectral type spec_T SU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 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) 1980 Tezcatlipoca (1950 LA)          Discovered 1950-Jun-19 by Wilson, A. G. at Palomar and A. A. E. Wallenquist Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 19:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin