Vertical motions of APOGEE & Gaia red clump stars J/ApJ/878/21 ivo://CDS.VizieR/J/ApJ/878/21 doi:10.26093/cds/vizier.18780021 CDS Ting Y.-S. Rix H.-W. 2023-06-08T08:34:55Z 2020-12-21T15:37:51Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr chemical-abundances stellar-ages stellar-distance It has long been known that the vertical motions of Galactic disk stars increase with stellar age, commonly interpreted as vertical heating through orbit scattering. Here we map the vertical actions of disk stars as a function of age ({tau}<=8Gyr) and across a large range of Galactocentric radii, R_GC_, drawing on APOGEE and Gaia data. We fit J_z_(R_GC,{tau}_) as a combination of the vertical action at birth, J_z,0_, and the subsequent heating {Delta}J_z,1Gyr_(R_GC_), which scales as {tau}^{gamma}(R_GC_)^. The inferred birth temperature, J_z,0_(R_GC_) is 1kpc.km/s for 3kpc<R_GC_<10kpc, consistent with the ISM velocity dispersion, but it rapidly rises outward, to 8kpc.km/s for R_GC_=14kpc, likely reflecting the stars' birth in a warped or flared gas disk. We find the heating rate {Delta}J_z,1Gyr_ to be modest and nearly constant across all radii, 1.6kpc.km/s/Gyr. The stellar age dependence {gamma} gently grows with Galactocentric radius, from {gamma}~1 for R_GC_<~R_{sun}_ to {gamma}~1.3 at R_GC_=14kpc. The observed J_z_-{tau} relation at all radii is considerably steeper ({gamma}>~1) than the time dependence theoretically expected from orbit scattering, J_z_{propto}t^0.5^. We illustrate how this conundrum can be resolved if we also account for the fact that at earlier epochs, the scatterers were more common, and the restoring force from the stellar disk surface mass density was low. Our analysis may reinstate gradual orbital scattering as a plausible and viable mechanism to explain the age-dependent vertical motions of disk stars. 2019ApJ...878...21T https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/878/21 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007) V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009) III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020) I/345 : Gaia DR2 (Gaia Collaboration, 2018) I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018) J/A+A/480/91 : Gal. disk stars vertical distribution. IV. (Soubiran+, 2008) J/ApJ/706/1364 : SINS survey of high-redshift gal. (Forster Schreiber+, 2009) J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011) J/MNRAS/419/1637 : Nearby red clump stars JHK observations (Laney+, 2012) J/MNRAS/421/3362 : Kinematics of galactic red clump stars (Bilir+, 2012) J/MNRAS/456/3655 : Masses and ages of red giants (Martig+, 2016) J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016) J/ApJ/823/114 : The Cannon: a new approach to determine masses (Ness+, 2016) J/ApJ/858/L7 : Red clump stars selected from LAMOST and APOGEE (Ting+, 2018) J/ApJS/239/32 : APOKASC-2 cat. of Kepler evolved stars (Pinsonneault+, 2018) J/ApJ/872/95 : GALEX & Gaia data for APOGEE red clump stars (Mohammed+, 2019) J/ApJ/872/137 : Abund. of red clump & RGB stars with APOGEE (Shetrone+, 2019) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/878/21 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/878/21 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/878/21 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/878/21 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/878/21 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/878/21 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/878/21/table1 (APOGEE red clump value-added catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/878/21/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/878/21/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/878/21/table1? GET text/xml+votable 180.0 50000 true 0.0186 58.90915 0.005555555555555556 4/187 911 922-923 944-945 1385 1388 5/119 215 280 282 286 304 310 316 320 322 324-326 328 330 332-333 336 339 341 343-345 350 352 354 356-358 360 362-363 366-369 372 378 381 384 389 391 404-405 407 413 424 436 438 440 444-445 447 451 455 457 464 470 480-481 484 488-489 491 493 495 607 629 636 733 735 738 742 745 756 760-761 764-766 769 773 785 790-792 794 798 804-805 807 809-811 818-819 822-823 826 831 835 838 842 850 864 866 871 898 903-904 907 910 915 917 922 929 934 937-939 942 1019 1537 1539 1638 1672 1680 1705 3098 3224 3235 3237 3245 3247-3248 3263 3290 3309 3321 3327 3493 3501 3503-3504 3507 3510-3511 3535 3543 3547 3549-3551 3555 3562 3566-3568 3574-3575 3578 3581 3583 3588-3590 3596 3601-3603 3606-3607 3614 3617 3624 3654 3666-3667 3671 3678 3683 3704 3706 3729-3734 3736-3737 3739-3741 3743 3784-3786 3789 3792 3845-3846 3854 3857-3858 3860-3861 3869-3870 3875 3888 3904 3908 3912 3917-3918 3922-3925 3941 3947 5215 5237 5239 5369 5389 5410 5413 5418 5424 5426 5432 5507 5509-5511 5514 5516 5518-5519 5521 5528 5532 5539 5551 5557 5559 5562-5563 5565-5566 5579 5601 5608 5610 5626-5627 5629 5719 5896 5905-5906 5908-5910 5915 5917 5919 5927 5934 5938-5939 5942 5946 5950 5952 5960-5961 5965 5978 5984-5986 5992 5994 5996-5997 6000 6007 6013 6020 6022 6029 6032 6039 6045 6047 6061 6067 6070-6072 6081 6083-6086 6089 6091 6093 6104 6106 6110 6114 6116-6118 6120 6122 6124 6126 6128 6136 7218 7223 7227 7273 7275-7276 7290-7291 7315 7326 7329 7337 7365 7378 7382-7383 7388 7391 7469 7552 7557 7559 7562 7564 7578-7579 7581 7588 7590 7593 7608-7609 7612 7629 7671 7673 7678-7679 7943 8022 10154 10157 10159 10172 12010-12011 6/77 82 133 147 150 152 155 336-337 340-342 374-375 380-381 383 408 410 432-434 467-470 473 475 523-524 545 670 749 854-855 857-859 881 884-885 1001 1003 1005 1013 1018 1055-1056 1058-1059 1064-1066 1077 1079 1087 1098-1099 1109 1116 1119 1134-1135 1139 1148 1150-1151 1173 1175 1221 1231-1234 1236 1246-1247 1253 1255 1268-1269 1277-1279 1286 1292 1294 1308 1310-1311 1316 1318 1324 1326 1336-1337 1340-1342 1348-1350 1353 1355 1360 1363 1369-1371 1385-1388 1390 1393 1412 1414 1420 1422 1436 1438 1447 1458-1459 1461 1463 1480-1481 1485 1496 1504 1506-1507 1516 1518 1529-1532 1534 1540 1542 1544-1545 1547 1585 1587-1589 1591 1596 1600 1602-1603 1608-1610 1625 1632 1649 1659 1662-1663 1674-1675 1695 1704 1717-1719 1724-1725 1738-1739 1743 1748 1750 1756 1765-1768 1772-1773 1775 1784-1785 1792-1793 1797-1800 1802-1803 1808 1813-1817 1819 1824-1825 1827 1833 1835-1836 1838 1841 1843-1846 1850-1851 1854 1869 1871-1873 1875-1878 1884 1893 1904 1930 1933 1940 1944-1945 1951 1960 1962 1968 1970-1971 1976-1977 1979 1998 2011 2014 2016 2018 2024 2032 2034-2036 2040-2041 2263 2373 2433 2440 2513 2515 2522-2523 2533-2535 2541 2552 2619 2623 2634 2659 2664-2665 2708 2781-2783 2804-2805 2828 2855 2860-2861 2863 2872-2874 2876 2931 2937 2939 2946-2947 2956 2959 2972 2974-2976 2987 2990-2991 3013 3015-3016 3018-3019 3021-3023 3028 3030 3032-3033 3037 3051 3053-3055 3070 3073-3075 3080-3081 3083-3084 3089-3091 3097 3099-3102 3112 3114 3127 3130-3131 3133-3135 3137-3139 3144-3145 3147-3150 3155-3156 3158-3159 3174 3180-3181 3183 3185-3188 3196-3197 3199-3200 3205 3207 3213 3224-3225 3227 3235 3249-3250 3256 3263-3264 3266 3269-3271 3280-3282 3285 3287 3297 3299-3302 3308 3310 3316-3317 3319 3323 3331 3334 3336-3337 3339 3347 3350 3356 3358-3359 3361-3364 3376-3377 3380 3395 3404 3406 3423-3424 3460 3462 3468 3478-3479 3483 3496 3498 3505 3508-3509 3514 3528 3560 3587-3588 3590-3591 3596-3598 3602 3605 3607 3609-3611 3622-3625 3633-3637 3645 3647-3649 3658-3659 3665 3667 3672 3674 3681 3684-3686 3692 3694 3696 3713-3715 3720-3721 3724 3731 3733-3735 3740-3742 3746-3747 3761-3763 3766-3767 3772-3774 3776-3777 3805 3810 3816 3821-3823 3828 3832-3834 3840 3842 3857-3860 3862 3864-3865 3942 3945 3947-3950 3975-3976 4001 4004 4008 4014 4036 4073 4075 4120 4132-4133 4144 4150 4251 4277-4279 4298 4320 4322 4331 4415 4437 4544 4559 4629 4672 4704 4706-4707 4746 4768 4770 4781-4783 4792 4794 4796 4846 4851 4853 4855 4860 4862-4863 4895 4916 4918 4935 4940 5059 5073 5105 5319 5366 5439 5482 5679 5738 5754 5789 5794 5805 5826 5831 5843 5982 6053 6067 6117 6125 6145 6147 6153 6161 6180 6182 6209-6210 6214-6218 6220-6222 6224 6240-6241 6243-6244 6246-6247 6251 6269 6271 6291 6298-6299 6306 6312 6324 6356-6357 6364 6366 6385 6387-6389 6391 6395-6398 6400 6403 6406 6408-6409 6437 6440 6522 6535-6536 6538 6541 6544-6545 6548 6550 6556 6558-6562 6564 6570-6571 6573-6574 6578 6581-6582 6584 6586 6588 6600 6606 6618 6625-6626 6628 6631 6633-6634 6636 6641-6642 6647 6650-6652 6654-6655 6667 6670 6677 6679 6685 6687 6692 6694 6696-6697 6700 6706 6726 6728 6740 6742-6743 6762-6763 6765 6767 6798-6799 6808 6810 6817 6819 6829-6830 6833-6836 6838-6841 6844 6849 6852-6853 6875 6877-6879 6912-6914 6917 6930 6934 6983 6997 7048 7079 7085 7087 7089-7091 7094 7096 7100-7101 7173 7175 7224 7236 7275 7283 7317 7330 7336 7339 7343 7360 7422 7517 7527 7536 7681 7711 7725 7744 7785-7786 7788 7958 7983 8080 8086 8090 8335 8348 8358 8423 8580 8698 8704 8791 9078 9160 9250 9258 9266 9273 9278 9350 9380 9416-9417 9428 9460 9465 9469 9472 9476 9478 9489 9493 9495 9502 9504 9518 9601 9607 9610 9640 9644 9664-9665 9686 9689 9705 9809 9852 9856 9902 9929 9941 9951 9954 9956 9962 9996 10026 10028 10086-10087 10093 10105 10187-10188 10190 10194 10197 10203 10224 10271 10321 11074 11154 11185 11352 11358 11397 11411-11412 11432 11492 11512 11521 11593 11659 11676 11741 11764-11765 11792 11795 11814 11883 11981 11986 12001 12021 12251 12271 12273 12275 12281 12288-12289 12382-12383 12387 12390 12397-12399 12405-12408 12413 12429 12480 12484 12576 12578 12614 12618 12640 12654-12655 12809 12829 12831 12853 12861-12863 12874-12875 12901 12906 12913-12915 12921 12930 12935-12936 12938 12952 12954-12955 12958-12959 12964-12965 12974 12976-12977 12986-12987 13000 13024 13026 13043-13044 13046-13047 13049 13111 13116-13117 13119 13152 13154 13159 13167-13168 13170 13178 13210 13215 13218 13224 13226 13235 13244-13245 13258 13263 13274 13280 13282 13288 13292-13293 13296-13298 13302-13303 13305 13307 13369 13606 13675 13717-13719 13725 13743 13751 13754 13757-13759 13761 13794 13798-13800 13804-13805 13855 13877 13879 13887 13897-13899 13912 13915 13920-13922 13925 13930-13931 13980-13981 13983 13986 13992 13994 14001 14003 14009 14022 14024 14034 14048 14050 14052-14053 14056 14062 14065 14067-14070 14075 14078-14079 14081 14083 14086-14087 14089 14092 14094 14100-14101 14109 14131 14134-14135 14137-14139 14150 14155-14156 14158-14159 14167 14177-14178 14186-14187 14194-14195 14211 14214-14215 14217-14219 14224-14225 14227-14230 14234 14241 14243-14244 14259 14262 14276-14277 14279-14281 14287-14290 14293-14295 14305-14307 14309-14311 14317 14320-14322 14328 14351 14364 14373 14375 14382-14383 14388 14390 14392-14393 14401-14403 14418-14419 14422-14423 14439 14445-14447 14449-14451 14475-14477 14480 14482 14500 14502 14505 14507 14522-14523 14526 14533 14535 14544 14559 14567 14573 14575 14620-14622 14640-14641 14643-14644 14673 14675-14676 14678 14681-14683 14688-14689 14692 14701 14703-14705 14708 14718 14730-14731 14743-14744 14746 14749-14751 14788-14789 14791-14792 14794-14795 14800-14801 14822 14828 14830 14841 14882 14914-14915 14940-14942 14952 14954-14955 14968-14969 14971 15007 15039-15041 15044-15045 15057 15059-15062 15148-15150 15153-15155 15160 15172-15174 15180 15200 15232 15338 15377-15379 15388-15390 15405 15407 15410-15411 15414 15420 15422 15425-15427 15436-15438 15448-15449 15452-15453 15457 15461 15463-15464 15466-15467 15469 15471 15473-15475 15485 15493 15495 15504-15506 15509 15512-15514 15524-15525 15530-15534 15543 15545 15547 15549 15551 15556 15574 15586 15603 15606 15608-15609 15611-15612 15614 15624 15626-15627 15645-15647 15652 15656-15658 15661-15663 15666 15679-15680 15682 15685-15687 15704-15706 15708 15712 15714 15716-15717 15748-15749 15760 15773 15778-15779 15781-15783 15785 15787 15795 15797-15800 15804 15808 15810 15837 15839 15861 15873 15876 15892-15893 15928 15953 16003 16024 16110-16111 16215 16223 16245 16887 16895 17179 17218 17285 17299 17391 17452 17501 17552 17602 17633 17645 17675 17732 17741 17747 17751-17752 17782 18004 18088-18089 18166 18256 18427 18430 18675 18782 18845 18888 18972 19013 19027 19079 19086 19089 19094-19096 19098-19099 19102 19114-19115 19118 19219 19231 19274 19283 19589 19672 19696 19702 19769 19771 19775 19797 19972 19974 19981 20062 20309 20322 20334 20367 20378-20379 20389 20403 20549 20551 20560 20562 20568 20743 20749-20751 20761-20763 20784 20801-20804 20806-20809 20812-20813 20851 20854-20855 20857 20859 20981 21274 21317 21328 21359 21370-21371 21373 21375 21402 21435 21445 21447 21456-21458 21460-21461 21464 21475 21480-21481 21483 21485-21487 21504-21505 21531 21534-21535 21544 21553 21555 21564-21565 21567 21600 21602 21608 21610-21611 21634 21661 21664 21666-21667 21670 21676-21678 21710 21732 21734-21737 21740 21742-21743 21757 21768 21771 21865 22016-22017 22019-22020 22022-22023 22025 22027 22034-22035 22052-22053 22055 22061-22063 22068-22069 22071 22081-22083 22088 22090 22092-22093 22095-22096 22098 22104 22106-22107 22117 22119-22120 22122 22125 22132 22134 22137 22139 22142-22146 22148 22153-22155 22176-22177 22179-22182 22193 22196-22197 22199 22225-22227 22233 22242-22243 22245-22247 22256 22258-22259 22269-22271 22274 22279 22313-22315 22323 22371-22372 22375 22377 22381 22401 22403 22410 22493 22498-22499 22513 22575 22717 22752 22798 22805 22828 22843 22850-22851 22860-22861 22863 22866-22867 22870 22872-22873 22875 22906-22907 22994 23017 23048 23061 23082 23086 23104 23128 23147 23186 23192 23196-23197 23212 23217-23218 23224-23226 23232 23240 23278 23365 23469 23472 23479 23482 23525 23546-23547 23550-23551 23562-23563 23572-23573 23581 23583 23588 23590 23592-23593 23616 23618-23619 23628-23630 23644-23646 23648-23649 23651-23652 23654-23655 23657 23659 23665 23667 23672-23674 23717 23719 23728-23729 23732-23733 23735 23742-23743 23748-23749 23751 23762-23763 23765-23767 23772-23773 23775-23778 23781 23789-23790 23792-23793 23795 23798 23804 23806 23816-23817 23822-23823 23838-23839 23848 23852-23853 23855-23858 23864 23866-23867 23869 23871 23882 23904 23906 23949 23952-23954 23957 23962-23963 23966 23972 23974-23975 23980-23982 23993 23995-23996 23998-23999 24008 24010-24012 24014-24015 24018-24019 24022-24025 24027 24032-24033 24035-24038 24042 24051 24060-24062 24069 24071 24084-24086 24092 24094-24095 24112-24113 24121 24124 24132 24134 24144-24145 24147-24148 24150-24151 24153 24155 24222-24223 24266-24267 24277 24279 24292-24293 24295 24304-24306 24309 24317 24319 24321 24323 24329-24331 24348 24350-24351 24354 24360-24362 24368 24370-24371 24376-24378 24383-24384 24394-24395 24429-24431 24434-24435 24438 24444 24446 24448 24450-24451 24453 24455 24461 24463 24476 24487 24492-24494 24500 24502 24508 24510 24516 24518 24520 24522-24524 24526-24529 24548-24550 24553 24555-24556 24558-24559 25339 25356 25379 25385 25588 25614 25616 25624 25706 25768 25816 25872-25873 25884 26058 26241 26417 26567 26679 26705 26724 26921 26942 27121 27192 27194 27240 27252 27254 27386 27402 27404 27424 27444 27621 27650 27953 28008-28009 28014 28077 28446 28634 28727 28733 28735 28757-28759 28764-28765 28770 28776 28778-28779 28781 28794 28813 28815 28820 28822-28824 28826 28829 28831 28843 28845 28848 28850 28852-28853 28855 28858-28861 28863-28866 28870-28871 28876 28878 28880 28882-28883 28888-28890 28896-28897 28900 28902 28904-28906 28912 28915-28916 28918-28921 28923 28926-28928 28932 28941 28943 28952 29066-29067 29070 29088-29089 29097-29098 29110-29111 29113-29115 29117-29119 29154-29155 29158 29179 29181-29183 29185 29187-29190 29199 29206-29207 29210-29213 29221 29230-29233 29242 29249 29251 29254 29256-29257 29269 29274 29284-29285 29287 29296 29298-29299 29324-29326 29328 29345 29440-29441 29445-29447 29456 29458-29459 29465 29469-29471 29504-29506 29508-29510 29516-29518 29521-29526 29540 29545-29548 29550-29551 29557-29559 29561 29563 29632-29633 29635-29636 29638 29664 29666 29673-29674 29676 29682 29689-29690 29741-29742 29752 29754 29800 29845 29855 29866-29867 29870-29871 29882-29885 29890-29892 29894 29896-29897 29900 29912 29916 29918 29920 29922-29923 29928-29930 29940 29997 30029 30034 30042 30064-30065 30141 30143 30184 30186 30190 30212-30213 30215-30216 30218-30220 30222-30224 30226-30227 30233 30240-30241 30244 30246-30247 30254 30260 30262-30265 30268-30269 30274 30280 30292-30293 30295 30301-30302 30307 30310 30321 30323 30328 30331-30332 30336-30338 30340 30342-30343 30349 30358 30364 30380-30381 30383-30384 30386-30387 30389 30392-30393 30401 30404-30405 30415-30417 30419-30422 30426-30427 30441 30452 30454 30456-30457 30464 30466 30472-30474 30485 30496 30498 30524-30525 30527-30529 30532-30533 30544-30546 30550 30552-30553 30556 30560 30562 30568 30570 30618-30619 30621-30623 30641 30644-30646 30667 30670 30675 30678-30679 30681 30689 30691 30697 30700-30701 30707 30710-30711 30747 30770-30772 30774 30776 30780 30831 30857 30862 30973 31056 31060 31138 31144 31147 31378 31601 31604 31748 31750-31751 31753 31756-31757 31768 31797 31818 32005 32007 32013 32016 32018-32019 32023-32026 32029 32043 32053 32071 32073-32075 32077 32079 32082 32092 32097 32102 32112-32113 32129 32132-32134 32145 32147-32148 32150-32151 32156 32460 32466 32497 32500 32502 32509 32701 32703 32754 36689 36727 36739-36740 36856 39915 39918 39933 39935 40622 40625 40627 40633 40666-40667 40670 40674 40677 40679-40680 40694 40739 40742 40744-40746 40748-40750 40798 40819-40821 40897 44771 47871 48033 48035 48056 48925 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/878/21?format=ascii default J/ApJ/878/21/table1 APOGEE red clump value-added catalog recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int APOGEE APOGEE identifier (from Ting+, 2018, J/ApJ/858/L7) meta.id;meta.main char [Fe/H] [-0.7/0.4] Abundance, [Fe/H] (1) phys.abund.Fe float [Mg/Fe] [-0.15/0.3] Abundance, [Mg/Fe] (1) phys.abund float Gaia Gaia DR2 (I/345) source identifier meta.id.cross RA_ICRS Gaia DR2 Right Ascension (ICRS) at Ep=2015.5 deg pos.eq.ra;meta.main indexed DE_ICRS Gaia DR2 Declination (ICRS) at Ep=2015.5 deg pos.eq.dec;meta.main indexed Age [0.16/8] Stellar age (2) Gyr time.age double Dist [0.026/8.8] Inferred photometric red clump distance from the Sun kpc pos.distance;pos.heliocentric double Rgc [3/16.4] Galactocentric observed radius kpc phys.size.radius;pos.galactocentric double Zgc [-0.5/0.5] Galactic observed height kpc pos.cartesian.z;pos.galactic double RgcBirth [0.00095/17.4]? Inferred birth radius kpc phys.size.radius double nullable RgcMean [1.8/14.7]? Mean Radius (3) kpc phys.size.radius;stat.mean double nullable JR [0/1492]? Radial phase space action kpc.km/s arith.grad;phys.veloc double nullable Lz [-125/6580] Angular momentum phase space action kpc.km/s phys.angMomentum double Jz [9e-5/1000] Vertical phase space action kpc.km/s arith.grad;phys.veloc double DR16 Display data from APOGEE-2 DR16 catalog (III/284) meta.ref.url char Simbad Simbad column added by the CDS meta.ref.url char _RA.icrs Right ascension (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.ra indexed _DE.icrs Declination (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.dec indexed