+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1529 Oterma (1938 BC) Classification: Outer Main-belt Asteroid          SPK-ID: 2001529 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2009343586722057 4.1219e-08   a 3.98729314604865 2.5896e-08 au q 3.186108954909284 1.6343e-07 au i 9.059753438436591 3.717e-06 deg node 100.6014117857518 2.8919e-05 deg peri 294.7066134790376 3.0218e-05 deg M 199.3775365535462 1.0681e-05 deg tp 2460498.036124267329 (2024-Jul-06.53612427) 9.3358e-05 TDB period 2908.14245226639 7.96 2.8331e-05 7.757e-08 d yr n .1237903596226666 1.206e-09 deg/d Q 4.788477337188017 3.11e-08 au   Orbit Determination Parameters    # obs. used (total)      2642      data-arc span      25772 days (70.56 yr)      first obs. used      1950-06-24      last obs. used      2021-01-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41418      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:04:37   Additional Information  Earth MOID = 2.20703 au   Jupiter MOID = .819906 au   T_jup = 2.999  [ 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 10.02   n/a E2021B10   diameter diameter 56.319 km 0.471 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)   rotation period rot_per 14.320 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Ditteon, R.; Adam, A.; Doyel, M.; Gibson, J.; et al. (2018) Minor Planet Bull. 45, 13-16.] [Warner, B.D.; Stephens, R.D.; Coley, D.R. (2018) Minor Planet Bull. 45, 147-161.] [Warner, B.D.; Stephens, R.D. (2020) Minor Planet Bull. 47, 309-313.] geometric albedo albedo 0.054   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)   B-V BV 0.764   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=8.26, mean=9.15, max.=10.19) deg. U-B UB 0.386   0.105 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.01, mean=9.60, max.=10.19) deg. Tholen spectral type spec_T P:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 1529 Oterma (1938 BC)          Discovered 1938-Jan-26 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1938 BC = 1950 PV = 1959 RD1 = A912 VO  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 22:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin