+ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1007016134425843 1.6313e-08   a 3.214078383954459 1.8556e-08 au q 2.890415504959311 5.586e-08 au i 15.01181609544378 7.0413e-07 deg node 264.2718565744786 5.0605e-06 deg peri 278.2084144696937 1.4171e-05 deg M 159.7346689789245 1.6792e-05 deg tp 2458266.644226354055 (2018-May-28.14422635) 9.4957e-05 TDB period 2104.665697569368 5.76 1.8226e-05 4.99e-08 d yr n .171048542490979 1.4813e-09 deg/d Q 3.537741262949606 2.0424e-08 au   Orbit Determination Parameters    # obs. used (total)      2745      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      .35402      source      ORB      producer      Otto Matic      solution date      2021-Mar-16 13:34:16   Additional Information  Earth MOID = 1.94019 au   Jupiter MOID = 1.72666 au   T_jup = 3.129  [ 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 11.06   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 1.89156475560716 1.89156416260191 1.89156534862929 5.10158896149735 5.01304610698487 2425830.880122086 2.85692667560912 307.32669622647 10.4926005239989 85.709431787953 12021357.00167 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 1940-Nov-22 00:25 00:03 Jupiter 1.85859526185683 1.85859504520541 1.85859547850994 4.23552367436442 4.12652341885973 2429955.517625252 2.57984108752189 238.043408425068 9.97976806175575 -86.5814518905048 12883777.0114422 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 1952-Feb-25 13:05 00:02 Jupiter 1.8778939749497 1.87789365173828 1.87789429816325 3.03370312831923 2.88119008985957 2434068.045326727 2.46556906617806 128.511770865465 13.2646197585259 -67.4612424716649 4740014.2819762 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 1963-Apr-23 08:20 00:02 Jupiter 1.90408481031785 1.90408466157811 1.90408495905791 1.77154237526768 1.49955742925099 2438142.847364526 2.31454255816555 103.518262208947 12.1399502913709 -53.8038305429557 5648408.23194825 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 1974-Jun-13 03:33 00:02 Jupiter 1.89564497066368 1.89564478488872 1.89564515644381 2.64451169688929 2.46977551830038 2442211.647860514 1.5058720696366 263.968999170694 6.92712926364679 81.2889930831454 5485215.89934157 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 1985-Sep-12 15:55 < 00:01 Jupiter 1.88508772265209 1.8850875329073 1.88508791239688 3.86066183384694 3.74246629734406 2446321.163080756 0.867016551971523 38.3869133750202 10.5811179308032 89.4756374051369 6046062.9520322 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 1997-Jan-03 20:58 < 00:01 Jupiter 1.91071807505459 1.91071786153753 1.91071828857177 4.70287050674012 4.60764470790415 2450452.373804440 0.473633092107171 46.4550241085989 8.96452474221613 84.7548140089958 15037292.4804813 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2008-Apr-28 20:14 < 00:01 Jupiter 1.99367669095951 1.99367648982372 1.9936768920953 5.3272332239345 5.2468757198999 2454585.342966414 0.191269019947834 25.4103659823535 9.08283475858024 82.7881059218987 12246886.3713173 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2131-Nov-21 03:48 00:02 Jupiter 1.95075052353457 1.95074927209028 1.95075177498662 5.53890130367385 5.45994696363906 2499715.658161118 2.27314344968018 211.131764825722 13.3094600435328 73.6630769947063 9641679.52814253 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2143-Mar-14 00:14 00:02 Jupiter 1.82343542120548 1.82343473821357 1.823436104212 5.05037477540522 4.95754425594317 2503846.509469540 2.4358655000256 277.461187134608 10.7888643922348 84.0195513974883 11640862.7837449 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2154-Jul-13 17:09 00:03 Jupiter 1.78343854669314 1.78343833984915 1.78343875353946 4.41288354438038 4.30391280391929 2507986.214585011 2.76021665958282 299.562318565435 9.55234304181479 -87.8346989370978 13985699.1530779 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2165-Nov-05 08:40 00:03 Jupiter 1.81712761843516 1.81712689005642 1.8171283468264 3.51238794640165 3.37707029568849 2512118.861387162 3.46769345010862 254.548988839989 10.7160213851903 -75.7768622328816 8586318.21490113 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2177-Jan-27 07:50 00:05 Jupiter 1.88421711321081 1.88421623353541 1.88421799288922 2.23464947681421 2.02350864797783 2516219.826052503 4.84256182782978 224.940261213612 22.4801718524645 -12.0943573551341 847616.662478713 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2188-Mar-10 20:46 00:06 Jupiter 1.92936876835529 1.92936841199159 1.92936912493801 2.09292792433717 1.8714477244605 2520280.365341328 5.5975498816248 1231.73887348903 9.13617947810144 80.0895402011369 6639871.18538212 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 2199-May-18 07:55 00:05 Jupiter 1.9484309979956 1.94843076974666 1.94843122624531 3.50691047928418 3.38067752110058 2524365.830132429 5.18864495208009 165.525402109309 6.75784951216403 76.4727373514174 2364383.58381007 T 40 CATAB v2.0f-lin.ifort 2021-Mar-16 13:35:10 2021-Mar-16 13:35 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-Apr-11 16:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin