{"id":3672789,"slug":"4fgl-j1857-9-0313","name":"4FGL J1857.9+0313","domain":"deep-sky","class":"quasar","otype":"Bz?","otype_label":"Blazar Candidate","ra":284.47839999999997,"dec":3.2185000000000006,"coo_err_mas":230400.0,"coo_bibcode":"2020ApJS..247...33A","plx_mas":null,"pmra":null,"pmdec":null,"rv_kms":null,"redshift":null,"dist_pc":null,"vmag":null,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":14,"simbad_oid":16020428,"gaia_dr3":null,"jpl_spkid":null,"ned_name":"4FGL J1857.9+0313","exo_name":null,"host_object_id":null,"depth":1,"deep_at":"2026-10-21T15:39:16.597362+00:00","views":12,"first_seen":"2026-08-14T16:54:16.002433+00:00","updated_at":"2026-08-14T16:54:16.002433+00:00","identifiers":["4FGL J1857.9+0313","4FGL J1857.9+0313c"],"measurements":[{"parameter":"sed_flux","value":0.000265,"value_text":null,"unit":"Jy","err_plus":4.2e-05,"err_minus":4.2e-05,"band":"Spitzer/IRAC:4.5","method":"II/293/glimpse","source":"vizier","reference":"II/293/glimpse","ref_year":null},{"parameter":"sed_flux","value":0.000399,"value_text":null,"unit":"Jy","err_plus":4.4e-05,"err_minus":4.4e-05,"band":"Spitzer/IRAC:3.6","method":"II/293/glimpse","source":"vizier","reference":"II/293/glimpse","ref_year":null},{"parameter":"sed_flux","value":1.69e-05,"value_text":null,"unit":"Jy","err_plus":8.9e-06,"err_minus":8.9e-06,"band":"UKIDSS:K","method":"II/316/gps6","source":"vizier","reference":"II/316/gps6","ref_year":null},{"parameter":"sed_flux","value":4.13e-05,"value_text":null,"unit":"Jy","err_plus":6.6e-06,"err_minus":6.6e-06,"band":"UKIDSS:H","method":"II/316/gps6","source":"vizier","reference":"II/316/gps6","ref_year":null},{"parameter":"sed_flux","value":6.55e-06,"value_text":null,"unit":"Jy","err_plus":5.38e-06,"err_minus":5.38e-06,"band":"UKIDSS:J","method":"II/316/gps6","source":"vizier","reference":"II/316/gps6","ref_year":null}],"orbit":null,"exoplanet":null,"sources":[{"source":"ned","url":"https://ned.ipac.caltech.edu/byname?objname=4FGL J1857.9+0313","fetched_at":"2026-10-21T15:39:06.209778+00:00"},{"source":"simbad","url":"https://simbad.cds.unistra.fr/simbad/sim-basic?Ident=4FGL J1857.9+0313","fetched_at":"2026-10-21T15:39:05.134582+00:00"},{"source":"vizier","url":"https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-c=284.478400%20+3.218500&-c.rs=5","fetched_at":"2026-10-21T15:39:16.592015+00:00"}]}