+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2145 Blaauw (1976 UF) Classification: Outer Main-belt Asteroid          SPK-ID: 2002145 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1007016726583951 4.4761e-08   a 3.214078394357851 2.0019e-08 au q 2.890415323990807 1.4043e-07 au i 15.01182036634328 3.7608e-06 deg node 264.2718652232002 1.9083e-05 deg peri 278.2083986296094 2.8573e-05 deg M 159.7346750441512 2.325e-05 deg tp 2458266.644186360875 (2018-May-28.14418636) 0.00013335 TDB period 2104.665707788003 5.76 1.9663e-05 5.383e-08 d yr n .1710485416604991 1.5981e-09 deg/d Q 3.537741464724895 2.2035e-08 au   Orbit Determination Parameters    # obs. used (total)      2724      data-arc span      16158 days (44.24 yr)      first obs. used      1976-10-24      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35646      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:00:40   Additional Information  Earth MOID = 1.94019 au   Jupiter MOID = 1.72666 au   T_jup = 3.129  [ hide covariance matrix ] Orbital Elements at Epoch 2457404.5 (2016-Jan-17.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09636241646980208 4.4795e-08   q 2.907996684706443 1.3953e-07 au tp 2458267.458754534934 (2018-May-28.95875453) 0.0001382 TDB node 264.3462568422353 1.9067e-05 deg peri 278.7321239198215 2.9093e-05 deg i 15.00880369368107 3.7523e-06 deg   Orbit Determination Parameters    # obs. used (total)      2724      data-arc span      16158 days (44.24 yr)      first obs. used      1976-10-24      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35646      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:00:40   Additional Information  Jupiter MOID = 1.72666 au   T_jup = 3.129  Orbit Covariance (6×6)   e q tp node peri i e 2.00657013460469E-15 -6.201940339326612E-15 -1.973442906438237E-12 -7.259553849997419E-16 -3.596881193258749E-13 3.801478979648414E-15 q -6.201940339326612E-15 1.946764271446146E-14 6.895174819202722E-12 7.017734212905284E-16 1.217291522216055E-12 -1.05165779228352E-14 tp -1.973442906438237E-12 6.895174819202722E-12 1.909976296233537E-8 -1.2956701170047E-12 3.080082837987048E-9 -4.483584917806881E-12 node -7.259553849997419E-16 7.017734212905284E-16 -1.2956701170047E-12 3.635347000849074E-10 -3.511236552489359E-10 2.585184052924396E-11 peri -3.596881193258749E-13 1.217291522216055E-12 3.080082837987048E-9 -3.511236552489359E-10 8.464051223383222E-10 -2.583068107126338E-11 i 3.801478979648414E-15 -1.05165779228352E-14 -4.483584917806881E-12 2.585184052924396E-11 -2.583068107126338E-11 1.408009297395068E-11 [ 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 11.06   n/a E2021B10   diameter diameter 40.549 km 0.848 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 12.141 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: [Moravec, P.; Cochren, J.; Gerhardt, M.; Harris, A.; et al. (2012) Minor Planet Bull. 39, 213-216.] geometric albedo albedo 0.051   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   2145 Blaauw (1976 UF)          Discovered 1976-Oct-24 by West, R. M. at La Silla 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 1929-Aug-07 09:07 00:03 Jupiter 1.89156467332256 1.89156384739811 1.89156549926669 5.10158785471584 5.01304497676914 2425830.879593696 3.48436884867436 377.12383183025 22.4618161469316 85.719627719933 4052684.40134685 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 1940-Nov-22 00:25 00:03 Jupiter 1.8585953681493 1.85859485815811 1.85859587814075 4.23552204680884 4.12652175462901 2429955.517163075 3.16125623166907 297.03442410553 23.4229575838444 -86.9232047817805 3214275.55445212 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 1952-Feb-25 13:05 00:03 Jupiter 1.87789414934455 1.87789352971889 1.87789476897139 3.03370018589001 2.88118700621386 2434068.044858540 3.02727439464327 167.944929509224 29.0985349404139 -69.3240130503958 1676331.67034638 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 1963-Apr-23 08:19 00:03 Jupiter 1.90408490331924 1.9040843384685 1.90408546816987 1.77154064998048 1.49955540552567 2438142.846838280 2.872211068463 143.055587590185 36.6864792110117 -45.3093212211068 2027525.27296303 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 1974-Jun-13 03:32 00:02 Jupiter 1.89564493657615 1.89564436208613 1.89564551107123 2.64451426437937 2.46977826418648 2442211.647465556 1.9063966715476 467.175768553964 28.069122987753 83.2260572560823 2287823.94053271 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 1985-Sep-12 15:54 00:01 Jupiter 1.88508765431449 1.88508713872838 1.88508816990082 3.86066389316003 3.74246841734243 2446321.162819611 1.11165003652385 130.165912461802 25.4540105443742 85.2540406202106 2313944.7586922 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 1997-Jan-03 20:58 < 00:01 Jupiter 1.91071802602681 1.91071757034607 1.91071848170766 4.70287182489281 4.60764605083029 2450452.373651369 0.631160816973674 88.229879387891 21.0654407374411 85.0543527404652 3527702.20250779 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2008-Apr-28 20:14 < 00:01 Jupiter 1.99367668258223 1.99367630713972 1.99367705802473 5.32723417206708 5.24687668221317 2454585.342885562 0.307625131446367 58.5092552905812 17.4728745726308 84.8441228406476 4842270.96935198 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2131-Nov-21 03:48 00:03 Jupiter 1.95075077014915 1.95074942146715 1.95075211884025 5.53890279770423 5.45994848932767 2499715.658422587 2.49554710827333 237.90807748401 24.2714464657605 75.1107522379717 4319320.09786024 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2143-Mar-14 00:14 00:03 Jupiter 1.82343556630487 1.82343482298313 1.82343630963997 5.05037638867083 4.95754590687345 2503846.509769091 2.69794862813857 311.282803744622 20.7963978080938 85.1252169702934 3987975.10046084 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2154-Jul-13 17:10 00:03 Jupiter 1.78343857783702 1.78343805366141 1.7834391020172 4.41288540289812 4.30391471141983 2507986.214942642 3.08962449860033 336.026152110687 21.7954329591846 -86.6736255299449 3413368.06449042 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2165-Nov-05 08:41 00:04 Jupiter 1.81712754847012 1.81712646224222 1.81712863471061 3.51239040767765 3.37707285027209 2512118.861851850 3.92300842594175 285.875054034264 25.8477078520749 -74.2706279822776 2402633.31091322 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2177-Jan-27 07:50 00:06 Jupiter 1.8842170165042 1.88421576837127 1.8842182646412 2.23465210625594 2.02351154038338 2516219.826703018 5.52430193345246 260.899308919759 52.7800349202819 -9.52694312862551 430336.699513156 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2188-Mar-10 20:47 00:06 Jupiter 1.92936873486094 1.92936804381574 1.9293694260598 2.09292425211598 1.87144361356961 2520280.366055977 6.40685366499015 1431.56352183009 32.3032373296191 80.1245207297093 2151869.01336656 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 2199-May-18 07:56 00:06 Jupiter 1.94843094010712 1.94843042436632 1.94843145584791 3.50690727824487 3.38067419671536 2524365.830802403 5.94023196229093 249.303438525859 28.6486642326681 80.6105285473768 743343.358272418 T 39 CATAB v2.0f-lin.ifort 2021-Feb-24 01:00:47 2021-Feb-24 01:00 Alternate Designations  1976 UF = 1929 XS = 1963 RK = 1980 TW  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-04 02:35 UT (server date/time)   Site Manager:   Ryan S. 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