+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1447 Utra (1938 BB) Classification: Main-belt Asteroid          SPK-ID: 2001447 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04052785848808872 2.7312e-08   a 2.536156295296594 7.4162e-09 au q 2.433371311857138 6.9514e-08 au i 4.783841160885648 4.4953e-06 deg node 35.50290059066754 4.1874e-05 deg peri 64.67714801021444 8.5816e-05 deg M 169.2820451986041 7.2679e-05 deg tp 2458306.801357211640 (2018-Jul-07.30135721) 0.00029785 TDB period 1475.239214594916 4.04 6.4709e-06 1.772e-08 d yr n .2440282202631469 1.0704e-09 deg/d Q 2.63894127873605 7.7168e-09 au   Orbit Determination Parameters    # obs. used (total)      2777      data-arc span      37495 days (102.66 yr)      first obs. used      1918-03-16      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41913      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:00:38   Additional Information  Earth MOID = 1.45478 au   Jupiter MOID = 2.40786 au   T_jup = 3.442  [ 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 11.7   n/a MPO267712   diameter diameter 11.834 km 0.122 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 257. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Martinez, L. (2011) http://lenomiyaobs.org/Blank.html] geometric albedo albedo 0.303   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1447 Utra (1938 BB)          Discovered 1938-Jan-26 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2165-May-30 13:18 00:01 Thisb 0.0422645450134105 0.042259094736081 0.0422699984719832 4.28930205278018 4.28930201516944 2511960.053860354 1.37916744283484 643.033893675695 35.128139916605 65.1900066009469 163347.71103927 T 39 CATAB v2.0f-lin.ifort 2020-Dec-18 02:00:45 2020-Dec-18 02:00 2186-May-07 04:17 00:02 Amphi 0.0334938218394699 0.0334797839499479 0.0335078601196396 1.41095402890162 1.41095390725628 2519606.678168090 2.41513583980496 718.966868116134 29.7447211518336 -14.3100470503444 42006.3410425281 T 39 CATAB v2.0f-lin.ifort 2020-Dec-18 02:00:45 2020-Dec-18 02:00 2196-May-13 19:13 00:02 Amphi 0.0458209481133068 0.0458054265460272 0.0458364697848686 1.43756294775227 1.43756286047882 2523266.300545536 2.34319303648024 777.236800490001 24.5636342791889 -7.63120471770852 37922.3655858502 T 39 CATAB v2.0f-lin.ifort 2020-Dec-18 02:00:45 2020-Dec-18 02:00 Alternate Designations  1938 BB = 1936 SB = 1951 KO = A918 FA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 10:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin