{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T00:03:34.801Z","years_from_j2000":26.671,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"ngc-5740","name":"NGC 5740","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":11.9,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":84213135.06390733,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":221.10187499999998,"dec_deg":1.6797777777777776,"epoch_ra_deg":221.443159,"epoch_dec_deg":1.565913,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":"1787","featured":false,"url":"https://spacecatalog.org/object/ngc-5740","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.6,"h_mag":9.07,"j_mag":9.82,"k_mag":8.88,"v_mag":11.9,"redshift":0.005268,"hubble_type":"Sb","wikidata_id":"Q1122529","redshift_cmb":0.006001367401398339,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14446054.780838238,14446054.780838238]},"major_axis_arcmin":2.7,"minor_axis_arcmin":1.34,"position_angle_deg":165,"surface_brightness":23,"radial_velocity_km_s":1575},"designations":[{"catalog":"2MASX","designation":"2MASX J14442442+0140468"},{"catalog":"IRAS","designation":"IRAS 14418+0153"},{"catalog":"IRAS","designation":"IRAS F14418+0153"},{"catalog":"LEDA","designation":"LEDA 52641"},{"catalog":"MCG","designation":"MCG +00-38-003"},{"catalog":"NGC","designation":"NGC 5740"},{"catalog":"PGC","designation":"PGC 52641"},{"catalog":"SDSS","designation":"SDSS J144424.44+014047.1"},{"catalog":"SDSS","designation":"SDSS J144424.45+014047.2"},{"catalog":"SDSS","designation":"SDSS J144424.50+014048.0"},{"catalog":"UGC","designation":"UGC 9493"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}