{"id":1776443,"slug":"ngc-1981","name":"NGC 1981","domain":"deep-sky","class":"cluster","otype":"OpC","otype_label":"OpenCluster","ra":83.84791666666666,"dec":-4.486111111111112,"coo_err_mas":null,"coo_bibcode":"2021A&A...647A..19T","plx_mas":2.5387,"pmra":1.071,"pmdec":0.614,"rv_kms":28.8,"redshift":9.6071075e-05,"dist_pc":null,"vmag":4.2,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":99,"simbad_oid":800928,"gaia_dr3":null,"jpl_spkid":null,"ned_name":null,"exo_name":null,"host_object_id":null,"depth":1,"deep_at":"2026-09-11T15:39:46.807124+00:00","views":4,"first_seen":"2026-08-14T16:50:15.847052+00:00","updated_at":"2026-08-14T16:50:15.847052+00:00","identifiers":["C 0532-044","[KPR2004b] 73","[KPS2012] MWSC 0579","NGC 1981","OCl 525.0","UBC 207","Upper Sword"],"measurements":[{"parameter":"distance","value":0.393,"value_text":null,"unit":"kpc","err_plus":0.015,"err_minus":-0.015,"band":null,"method":null,"source":"simbad","reference":"2021MNRAS.503.3279S","ref_year":2021},{"parameter":"distance","value":378.0,"value_text":null,"unit":"pc","err_plus":null,"err_minus":null,"band":null,"method":"paral","source":"simbad","reference":"2021A&A...651A.104P","ref_year":2021},{"parameter":"distance","value":422.0,"value_text":null,"unit":"pc","err_plus":null,"err_minus":null,"band":null,"method":null,"source":"simbad","reference":"2017AstBu..72..257L","ref_year":2017},{"parameter":"distance","value":400.0,"value_text":null,"unit":"pc","err_plus":null,"err_minus":null,"band":null,"method":"ST-L","source":"simbad","reference":"2005A&A...438.1163K","ref_year":2005},{"parameter":"magnitude","value":4.2,"value_text":null,"unit":"mag","err_plus":null,"err_minus":null,"band":"V","method":null,"source":"simbad","reference":null,"ref_year":null},{"parameter":"metallicity","value":-0.18,"value_text":null,"unit":"dex","err_plus":null,"err_minus":null,"band":null,"method":null,"source":"simbad","reference":"2020AJ....159..199D","ref_year":2020},{"parameter":"parallax","value":2.601,"value_text":null,"unit":"mas","err_plus":0.047,"err_minus":0.047,"band":null,"method":null,"source":"simbad","reference":"2023A&A...674A..37G","ref_year":2023},{"parameter":"parallax","value":3.019,"value_text":null,"unit":"mas","err_plus":0.167,"err_minus":0.167,"band":null,"method":null,"source":"simbad","reference":"2022ApJS..262....7H","ref_year":2022},{"parameter":"parallax","value":2.569,"value_text":null,"unit":"mas","err_plus":0.04,"err_minus":0.04,"band":null,"method":null,"source":"simbad","reference":"2021A&A...651A.104P","ref_year":2021},{"parameter":"parallax","value":2.54,"value_text":null,"unit":"mas","err_plus":0.094,"err_minus":0.094,"band":null,"method":null,"source":"simbad","reference":"2021MNRAS.503.3279S","ref_year":2021},{"parameter":"parallax","value":2.5387,"value_text":null,"unit":"mas","err_plus":0.0658,"err_minus":0.0658,"band":null,"method":null,"source":"simbad","reference":"2020A&A...635A..45C","ref_year":2020},{"parameter":"parallax","value":2.544,"value_text":null,"unit":"mas","err_plus":0.07,"err_minus":0.07,"band":null,"method":null,"source":"simbad","reference":"2020A&A...640A...1C","ref_year":2020},{"parameter":"pm_dec","value":0.598,"value_text":null,"unit":"mas/yr","err_plus":0.424,"err_minus":0.424,"band":null,"method":null,"source":"simbad","reference":"2023A&A...674A..37G","ref_year":2023},{"parameter":"pm_dec","value":-0.834,"value_text":null,"unit":"mas/yr","err_plus":0.874,"err_minus":0.874,"band":null,"method":null,"source":"simbad","reference":"2022ApJS..262....7H","ref_year":2022},{"parameter":"pm_dec","value":0.569,"value_text":null,"unit":"mas/yr","err_plus":0.362,"err_minus":0.362,"band":null,"method":null,"source":"simbad","reference":"2021MNRAS.503.3279S","ref_year":2021},{"parameter":"pm_dec","value":0.586,"value_text":null,"unit":"mas/yr","err_plus":0.426,"err_minus":0.426,"band":null,"method":null,"source":"simbad","reference":"2021A&A...651A.104P","ref_year":2021},{"parameter":"pm_dec","value":0.555,"value_text":null,"unit":"mas/yr","err_plus":0.474,"err_minus":0.474,"band":null,"method":"ICRS","source":"simbad","reference":"2020A&A...640A...1C","ref_year":2020},{"parameter":"pm_dec","value":0.614,"value_text":null,"unit":"mas/yr","err_plus":0.377,"err_minus":0.377,"band":null,"method":"ICRS","source":"simbad","reference":"2020A&A...635A..45C","ref_year":2020},{"parameter":"pm_dec","value":1.36,"value_text":null,"unit":"mas/yr","err_plus":0.14,"err_minus":0.14,"band":null,"method":"ICRS","source":"simbad","reference":"2017AstBu..72..257L","ref_year":2017},{"parameter":"pm_dec","value":1.36,"value_text":null,"unit":"mas/yr","err_plus":1.57,"err_minus":1.57,"band":null,"method":"ICRS","source":"simbad","reference":"2014A&A...564A..79D","ref_year":2014},{"parameter":"pm_ra","value":0.996,"value_text":null,"unit":"mas/yr","err_plus":0.269,"err_minus":0.269,"band":null,"method":null,"source":"simbad","reference":"2023A&A...674A..37G","ref_year":2023},{"parameter":"pm_ra","value":0.703,"value_text":null,"unit":"mas/yr","err_plus":0.625,"err_minus":0.625,"band":null,"method":null,"source":"simbad","reference":"2022ApJS..262....7H","ref_year":2022},{"parameter":"pm_ra","value":1.11,"value_text":null,"unit":"mas/yr","err_plus":0.238,"err_minus":0.238,"band":null,"method":null,"source":"simbad","reference":"2021MNRAS.503.3279S","ref_year":2021},{"parameter":"pm_ra","value":0.989,"value_text":null,"unit":"mas/yr","err_plus":0.258,"err_minus":0.258,"band":null,"method":null,"source":"simbad","reference":"2021A&A...651A.104P","ref_year":2021},{"parameter":"pm_ra","value":1.086,"value_text":null,"unit":"mas/yr","err_plus":0.199,"err_minus":0.199,"band":null,"method":"ICRS","source":"simbad","reference":"2020A&A...640A...1C","ref_year":2020},{"parameter":"pm_ra","value":1.071,"value_text":null,"unit":"mas/yr","err_plus":0.202,"err_minus":0.202,"band":null,"method":"ICRS","source":"simbad","reference":"2020A&A...635A..45C","ref_year":2020},{"parameter":"pm_ra","value":3.22,"value_text":null,"unit":"mas/yr","err_plus":0.23,"err_minus":0.23,"band":null,"method":"ICRS","source":"simbad","reference":"2017AstBu..72..257L","ref_year":2017},{"parameter":"pm_ra","value":3.22,"value_text":null,"unit":"mas/yr","err_plus":2.61,"err_minus":2.61,"band":null,"method":"ICRS","source":"simbad","reference":"2014A&A...564A..79D","ref_year":2014},{"parameter":"radial_velocity","value":22.122,"value_text":null,"unit":"km/s","err_plus":0.988,"err_minus":0.988,"band":null,"method":"v","source":"simbad","reference":"2023A&A...674A..37G","ref_year":2023},{"parameter":"radial_velocity","value":23.75,"value_text":null,"unit":"km/s","err_plus":4.57,"err_minus":4.57,"band":null,"method":"v","source":"simbad","reference":"2022A&A...668A...4F","ref_year":2022},{"parameter":"radial_velocity","value":29.03,"value_text":null,"unit":"km/s","err_plus":0.34,"err_minus":0.34,"band":null,"method":"v","source":"simbad","reference":"2021A&A...647A..19T","ref_year":2021},{"parameter":"radial_velocity","value":28.8,"value_text":null,"unit":"km/s","err_plus":0.2,"err_minus":0.2,"band":null,"method":"v","source":"simbad","reference":"2020AJ....159..199D","ref_year":2020},{"parameter":"radial_velocity","value":27.9,"value_text":null,"unit":"km/s","err_plus":2.4,"err_minus":2.4,"band":null,"method":"v","source":"simbad","reference":"2017AstBu..72..257L","ref_year":2017},{"parameter":"radial_velocity","value":27.9,"value_text":null,"unit":"km/s","err_plus":2.4,"err_minus":2.4,"band":null,"method":"v","source":"simbad","reference":"2017A&A...600A.106C","ref_year":2017},{"parameter":"sed_flux","value":8.56e-05,"value_text":null,"unit":"Jy","err_plus":8.5e-06,"err_minus":8.5e-06,"band":"VISTA:J","method":"II/359/vhs_dr4","source":"vizier","reference":"II/359/vhs_dr4","ref_year":null},{"parameter":"sed_flux","value":8.68e-05,"value_text":null,"unit":"Jy","err_plus":8.6e-06,"err_minus":8.6e-06,"band":"2MASS:J","method":"I/353/gsc242","source":"vizier","reference":"I/353/gsc242","ref_year":null},{"parameter":"sed_flux","value":0.000109,"value_text":null,"unit":"Jy","err_plus":6e-06,"err_minus":6e-06,"band":"SDSS:g","method":"I/353/gsc242","source":"vizier","reference":"I/353/gsc242","ref_year":null},{"parameter":"sed_flux","value":0.000149,"value_text":null,"unit":"Jy","err_plus":2.8e-05,"err_minus":2.8e-05,"band":"SkyMapper/SkyMapper:g","method":"II/358/smss","source":"vizier","reference":"II/358/smss","ref_year":null}],"orbit":null,"exoplanet":null,"sources":[{"source":"simbad","url":"https://simbad.cds.unistra.fr/simbad/sim-basic?Ident=NGC 1981","fetched_at":"2026-09-11T15:39:27.563632+00:00"},{"source":"vizier","url":"https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-c=83.847917%20-4.486111&-c.rs=5","fetched_at":"2026-09-11T15:39:46.805755+00:00"}]}