+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1231 Auricula (1931 TE2) Classification: Main-belt Asteroid          SPK-ID: 2001231 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08583378867456451 3.3456e-08   a 2.668795267220452 9.7205e-09 au q 2.439722458238174 8.9354e-08 au i 11.48425144984418 4.3386e-06 deg node 342.0255167906745 1.699e-05 deg peri 245.7662128396021 3.0842e-05 deg M 306.7029291313611 2.7351e-05 deg tp 2459436.261103588801 (2021-Aug-09.76110359) 0.00012125 TDB period 1592.470203496872 4.36 8.7004e-06 2.382e-08 d yr n .2260638844039176 1.2351e-09 deg/d Q 2.897868076202731 1.0555e-08 au   Orbit Determination Parameters    # obs. used (total)      2594      data-arc span      32608 days (89.28 yr)      first obs. used      1931-10-10      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42151      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:53:42   Additional Information  Earth MOID = 1.45709 au   Jupiter MOID = 2.15562 au   T_jup = 3.348  [ hide covariance matrix ] Orbital Elements at Epoch 2456539.5 (2013-Sep-04.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08689803281304985 3.3214e-08   q 2.436855436990375 8.8773e-08 au tp 2456254.232758056606 (2012-Nov-22.73275806) 0.00011829 TDB node 342.0697599737115 1.698e-05 deg peri 246.3423742452229 3.0713e-05 deg i 11.48942895137726 4.3398e-06 deg   Orbit Determination Parameters    # obs. used (total)      2594      data-arc span      32608 days (89.28 yr)      first obs. used      1931-10-10      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42151      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:53:42   Additional Information  Jupiter MOID = 2.15562 au   T_jup = 3.348  Orbit Covariance (6×6)   e q tp node peri i e 1.103169509633335E-15 -2.933990552346607E-15 -1.055597801959277E-12 -3.764594915783337E-15 -2.030441362283613E-13 -1.240973570377423E-16 q -2.933990552346607E-15 7.880628990562952E-15 2.873015477830217E-12 9.539730222140545E-15 5.556071608318542E-13 5.497479620089759E-16 tp -1.055597801959277E-12 2.873015477830217E-12 1.399198537159213E-8 2.716053509307249E-11 3.036294185538057E-9 4.398479576945933E-12 node -3.764594915783337E-15 9.539730222140545E-15 2.716053509307249E-11 2.883338860177253E-10 -2.763784382974392E-10 -2.636511024745637E-12 peri -2.030441362283613E-13 5.556071608318542E-13 3.036294185538057E-9 -2.763784382974392E-10 9.432991042369136E-10 3.560632993631036E-12 i -1.240973570377423E-16 5.497479620089759E-16 4.398479576945933E-12 -2.636511024745637E-12 3.560632993631036E-12 1.883381704190056E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.29   n/a E2021B10   diameter diameter 18.713 km 0.650 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 3.9816 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Bembrick, C.; Crawford, G.; Allen, B. (2008) Minor Planet Bull. 35, 185.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] geometric albedo albedo 0.066   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1231 Auricula (1931 TE2)          Discovered 1931-Oct-10 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 17:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin