J/AJ/163/165ivo://CDS.VizieR/J/AJ/163/165doi:10.26093/cds/vizier.51630165CDSMarsset M.DeMeo F.E.Burt B.Polishook D.Binzel R.P.Granvik M.,Vernazza P.Carry B.Bus S.J.Slivan S.M.Thomas C.A.Moskovitz N.A.,Rivkin A.S.2022-06-13T10:01:49Z2022-05-25T07:49:51ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsolar-systemasteroidsinfrared-astronomyspectroscopyWe report 491 new near-infrared spectroscopic measurements of 420 near-Earth objects (NEOs) collected on the NASA InfraRed Telescope Facility as part of the MIT-Hawaii NEO Spectroscopic Survey. These measurements were combined with previously published data from Binzel et al. and bias-corrected to derive the intrinsic compositional distribution of the overall NEO population, as well as of subpopulations coming from various escape routes (ERs) in the asteroid belt and beyond. The resulting distributions reflect well the overall compositional gradient of the asteroid belt, with decreasing fractions of silicate-rich (S- and Q-type) bodies and increasing fractions of carbonaceous (B-, C-, D- and P-type) bodies as a function of increasing ER distance from the Sun. The close compositional match between NEOs and their predicted source populations validates dynamical models used to identify ERs and argues against any strong composition change with size in the asteroid belt between ~5km and ~100m. A notable exception comes from the overabundance of D-type NEOs from the 5:2J and, to a lesser extend, the 3:1J and {nu}6 ERs, hinting at the presence of a large population of small D-type asteroids in the main belt. Alternatively, this excess may indicate preferential spectral evolution from D-type surfaces to C and P types as a consequence of space weathering, or point to the fact that D-type objects fragment more often than other spectral types in the NEO space. No further evidence for the existence of collisional families in the main belt, below the detection limit of current main-belt surveys, was found in this work.2022AJ....163..165Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/165CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/118 : UBVRI standards around Celestial Equator (Landolt 1983)J/ApJ/741/68 : Main Belt asteroids with WISE/NEOWISE. I. (Masiero+, 2011)J/PASJ/63/1117 : Asteroid catalog using AKARI (AcuA). V1. (Usui+, 2011)J/AJ/152/63 : NEOWISE reactivation mission; 2nd yr data (Nugent+, 2016)J/AJ/154/168 : NEOWISE; thermal model fits for NEOs and MBAs (Masiero+, 2017)J/AJ/156/60 : Thermal model fits for short-arc NEOs NEOWISE (Masiero+, 2018)J/AJ/158/196 : Near-Earth Object Survey spectroscopy (Devogele+, 2019)J/AJ/157/94 : Col-OSSOS Prop. outer solar system objects (Marsset+, 2019)J/ApJS/243/12 : Colors of Outer Solar System Origins Survey (Schwamb+, 2019)J/A+A/652/A59 : SDSS Solar System Objects (Sergeyev+, 2021)J/A+A/654/A56 : Largest main belt asteroids data (Vernazza+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/165https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/165http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/165https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/165https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/165http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/165GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/163/165/table7 (Complete tabulation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/163/165/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/163/165/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/163/165/table7?GETtext/xml+votable180.050000true317.62125-2.1483330.0055555555555555566/51 62 212 352 442 523 537 573 588 630 647 651 690 693 695-696 931 954 987 1056 1080 1126 1294 1347 1382 1460 1477 1485 1566 1591 1683 1759 1763 1864 1879 1968 1980 2002 2104 2108 2151 2180 2214 2217 2251 2307 2327 2349 2375 2507 2576 2581 2594 2609 2625 2681 2762 2767 2827 2887 3117 3185 3464 4220 4259 4319 4359 4369 4474 4671 4717 4768 4772 4791 4850 4896 5002 5012 5134 5155 5189 5268 5383 5473 5494 5540 5675 5775 5841 6045 6061 6115 6125 6210 6301 6330 6465 6470 6558 6566 6613 6659 6669 6677 6679 6896 6903 7009 7034 7037 7168 7227 7250 7301 7318 7343 7352 7425 7755 8225 8235 8291 8371 8374 8538 8595 8617 8672 8684 8756 8802 8826 8961 9034 9345 9360 9683 9813 9815 9915 9977 9994 10096 10122 10259 10447 10582 10623 10660 10865 10897 10925 11063 11091 11165 11204 11513 11808 11856 11876 12288 12330 12342 12360 12452 12610 12616 12622 12642 13004 13199 13338 13400 13427 13553 13731 13927 13934 14113 14290 14947 14951 15484 15560 16004 16031 16441 16774 16786 16850 16949 17063 17140 17150 17285 17315 17355 17430 17549 17564 17628 17680 17728 17744 17848 17897 17927 17950 18050 18236 18251 18268 18353-18354 18517 18604 18611 18626 18638 18668 18680 18715 18935 19104 19163 19246 19370 19397 19402 19486 19546 19561 19624 19664 19755 19797 19803 19807 19817 19838 19844 19883 19981 20023 20030 20072 20154 20202-20203 20305 20329 20332 20340 20430 20454 20476 20884 21147 21169 21207 21410 21477 21487 21508 21517 21649 21733 21802 21872 21884 21923 21937 22098 22194 22288 22322 22408 22412 22428 22459 22466 22516 22528 22582 22759 22812 22814 22854 22948 23029 23126 23134 23231 23240 23261 23313 23337 23402 23490 23506 23562-23563 23606 23620 23630 23633 23713 23733 23894 23933 23944 24007 24012 24031 24047 24060 24116 24232-24233 24245 24298 24322 24383 24466 25044 25204-25205 25242 25307 25415 25438 25461 25463 25492 25509 25541 25660 25674 25691 25699 25743 25746 25790 25814 25839 25913 25980 26126 26135 26390 26392 26500 26673 26682-26683 26760 26805 26973 26997 27009 27065 27173 27181 27188 27278 27313 27377 27434 27446 27633 27793 27863 27868 27981-27982 28001 28114 28141 28150 28237 28264 28297 28420 28476 28548 28554 28612 28618 28776 28846 28914 28941 28959 29095 29140 29146 29192 29262 29291 29293 29361 29416 29453 29506 29566 29714 29883 29988 30157 30327 30682 30754 30861 31342 31506 31601 31701 31724 31756 32044 32226 32260 32326 32494 32727 34650 34664 35582 35667 35895 36028 36122 36192 36203 36275 36454 36545 36734 36750 36781 36838 36846 38743 39814 40535 40602 40655 40716 40824 40922 40936 42489 42991 42996 42998 44217 44336 44366 44480 44504 44628 44701 44719 44743 44869 44903 44929 44945 44955 44976 46855 47008 47017 48153 48232 48281 48301 48703 48876 48975-48976 49023 49069 49134 49139https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/163/165?format=asciiInfrareddefaultJ/AJ/163/165/table7Complete tabulationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFileSpectrum filenamemeta.id;meta.filecharNumber[433/531060]? Near-Earth Object Numbermeta.idintnullableDesigProvisional designationmeta.idcharNameNamemeta.id;meta.mainchara[0.64/3.36] Semi-major Axisauphys.angSize.smajAxis;src.orbitaldoublee[0.03/0.9] Eccentricitysrc.orbital.eccentricitydoublei[0.44/63.8] Inclinationdegsrc.orbital.inclinationdoubleHmag[9.25/27.7] H Magnitudemagphot.mag;em.IR.HfloatTJup[2.39/8.5] Jupiter Tisserandsrc.orbitaldoubleDelta-v[4.1/23.6]? Velocity Change Needed for Rendez-vous Missionkm/sphys.velocfloatnullableHazard?Potentially Hazardous? Yes or Nometa.codecharTaxonTaxonomymeta.codecharSlope[-0.19/1.09] Spectral Slopeum**-1pos.lunar.occultfloatPC1[-1.46/1.79] 1st Principal Component (1)phot.flux.densityfloatPC2[-0.75/1.2] 2nd Principal Component (1)phot.flux.densityfloatPC3[-0.62/0.63] 3rd Principal Component (1)phot.flux.densityfloatPC4[-0.31/0.25] 4th Principal Component (1)phot.flux.densityfloatPC5[-0.21/0.3] 5th Principal Component (1)phot.flux.densityfloatObsY-S[2003/2021] Start Date Time, yeartime.epochintObsM-SStart Date Time, monthtime.epochintObsD-SStart Date Time, daytime.epochintObsH-SStart Date Time, hourtime.epochintObsm-SStart Date Time, minutetime.epochintObsS-SStart Date Time, secondtime.epochfloatObsY-E[2003/2021] End Date Time, yeartime.epochintObsM-EEnd Date Time, monthtime.epochintObsD-EEnd Date Time, daytime.epochintObsH-EEnd Date Time, hourtime.epochintObsm-EEnd Date Time, minutetime.epochintObsS-EEnd Date Time, secondtime.epochfloatRAJ2000[0/23] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[0/68] Degree of Declination (J2000)pos.eq.dec;meta.mainAmass-S[1/1.97] Start Airmassobs.airMassfloatAmass-E[1/2.17] End Airmassobs.airMassfloatParAng-S[-178/179] Start Parallactic Angledegtime.start;pos.posAngfloatParAng-E[-180/180] End Parallactic Angledegtime.end;pos.posAngfloatTexp[14.8/120] Exposure Timestime.duration;obs.exposuredoubleNimages[12/23] Number of Imagesmeta.numberintTTexp[466/2760] Total Exposure Timestime.duration;obs.exposurefloatGeoDist[0.001/2.34] Geocentric Distance (AU)pos.distancefloatSolDist[0.97/3.32] Solar Distance (AU)pos.distancefloatPhaseAng[1.2/104] Phase Angledegsrc.orbitalfloatVismag[10.7/18.8] Visual Magnitudemagphot.mag;em.opt.VfloatP[Hun][0/0.9] Hungaria Escape Route Probabilitystat.fit.goodnessdoubleP[nu6][0/1] nu6 Escape Route Probabilitystat.fit.goodnessdoubleP[Pho][0/1] Phocaea Escape Route Probabilitystat.fit.goodnessdoubleP[3:1J][0/0.88] 3:1J Escape Route Probabilitystat.fit.goodnessdoubleP[5:2J][0/0.9] 5:2J Escape Route Probabilitystat.fit.goodnessdoubleP[2:1J][0/0.98] 2:1J Escape Route Probabilitystat.fit.goodnessdoubleP[JFC][0/0.54] JFC Escape Route Probabilitystat.fit.goodnessdouble