+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   25924 Douglasadams (2001 DA42) Classification: Main-belt Asteroid          SPK-ID: 2025924 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1660157998927282 2.9522e-08   a 2.414764993206687 9.2848e-09 au q 2.01387585130652 7.3677e-08 au i 1.727550089087776 4.1978e-06 deg node 307.2479626439982 0.00012473 deg peri 313.6283926440091 0.00012559 deg M 313.8833089522084 1.4639e-05 deg tp 2459176.076493516746 (2020-Nov-22.57649352) 5.5775e-05 TDB period 1370.600019861037 3.75 7.9049e-06 2.164e-08 d yr n .2626586858188574 1.5149e-09 deg/d Q 2.815654135106853 1.0826e-08 au   Orbit Determination Parameters    # obs. used (total)      911      data-arc span      8538 days (23.38 yr)      first obs. used      1997-01-09      last obs. used      2020-05-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55629      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:31:47   Additional Information  Earth MOID = .998903 au   Jupiter MOID = 2.253 au   T_jup = 3.498  [ hide covariance matrix ] Orbital Elements at Epoch 2456963.5 (2014-Nov-02.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1668567117110577 2.9501e-08   q 2.011499880044083 7.3667e-08 au tp 2456433.895249671839 (2013-May-21.39524967) 5.69e-05 TDB node 307.3268218941312 0.00012454 deg peri 313.4466605658183 0.00012538 deg i 1.729510430549818 4.2001e-06 deg   Orbit Determination Parameters    # obs. used (total)      911      data-arc span      8538 days (23.38 yr)      first obs. used      1997-01-09      last obs. used      2020-05-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55629      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:31:47   Additional Information  Jupiter MOID = 2.253 au   T_jup = 3.498  Orbit Covariance (6×6)   e q tp node peri i e 8.703055376144173E-16 -2.162075266903277E-15 3.261841891925309E-13 2.820037797793726E-15 7.738970648150661E-14 1.458857697753684E-16 q -2.162075266903277E-15 5.426801905842803E-15 -8.897657465576986E-13 -7.116974579375996E-15 -2.06874648162468E-13 -2.5563547857398E-16 tp 3.261841891925309E-13 -8.897657465576986E-13 3.237599526589022E-9 -9.934229938272896E-12 8.409426796225199E-10 1.169053054681162E-13 node 2.820037797793726E-15 -7.116974579375996E-15 -9.934229938272896E-12 1.550949225907395E-8 -1.55045846434722E-8 1.657352758912385E-10 peri 7.738970648150661E-14 -2.06874648162468E-13 8.409426796225199E-10 -1.55045846434722E-8 1.572105324604653E-8 -1.656191006188945E-10 i 1.458857697753684E-16 -2.5563547857398E-16 1.169053054681162E-13 1.657352758912385E-10 -1.656191006188945E-10 1.764048453027222E-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 15.7   n/a MPO426059   diameter diameter 2.410 km 0.528 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.210   0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   25924 Douglasadams           Discovered 2001 Feb. 19 by LINEAR at Socorro. The provisional designation of this object is singularly appropriate to honor Douglas Adams (1952-2001), author of The Hitchhiker's Guide to the Galaxy. In their cosmic travels following the earth's destruction, his two protagonists ascertained that the answer to Life, the Universe and Everything was the number 42. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050125/MPCPages.arc Last Updated: 2005-06-01 [ 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 1940-Aug-09 11:21 00:01 David 0.0405420947630113 0.0405376461887627 0.0405465462432177 7.05650491854677 7.0565048657403 2429850.972936002 1.03070046253621 591.750839062257 36.5181754220296 68.2537702926695 154261.903505906 T 24 CATAB v2.0f-lin.ifort 2020-Nov-13 01:31:49 2020-Nov-13 01:31 2079-Nov-17 20:28 < 00:01 Hebe 0.0345431638167945 0.0345323040941195 0.034554024546243 7.73011430158324 7.73011427830181 2480720.352572919 0.871740683563199 616.521050447359 40.1583130475586 -28.6345230691488 62090.8216410138 T 24 CATAB v2.0f-lin.ifort 2020-Nov-13 01:31:49 2020-Nov-13 01:31 2083-Aug-24 15:56 < 00:01 Hebe 0.041625205159243 0.0416132664554238 0.0416371445506378 8.15986313279626 8.15986311449343 2482096.163694392 0.930740497945934 652.559861398185 40.8451565259615 24.2387082257731 63178.8499643472 T 24 CATAB v2.0f-lin.ifort 2020-Nov-13 01:31:49 2020-Nov-13 01:31 2187-Jan-19 17:21 00:01 Amphi 0.0488732441353969 0.0488401101863987 0.0489063794799776 4.30297682131808 4.30297679398221 2519864.222972589 1.12874748808188 1701.87617423066 39.3659386775276 13.9861987320036 45058.8615899337 T 24 CATAB v2.0f-lin.ifort 2020-Nov-13 01:31:49 2020-Nov-13 01:31 Alternate Designations  2001 DA42 = 1999 VX149  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-24 20:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin