{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T22:53:38.389Z","years_from_j2000":26.679,"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-1803","name":"NGC 1803","class":"barred_spiral_galaxy_sbbc","category":"galaxy","object_type":"Barred spiral galaxy SBbc","mag":12.86,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":194484115.58401346,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":76.36075,"dec_deg":-49.56794444444445,"epoch_ra_deg":76.535039,"epoch_dec_deg":-49.530676,"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":"Pictor","discovered":"1834","featured":false,"url":"https://spacecatalog.org/object/ngc-1803","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.39,"v_mag":12.86,"redshift":0.013686,"hubble_type":"SBbc","wikidata_id":"Q1045414","redshift_cmb":0.013778866121280764,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16151963.630623858,16151963.630623858]},"major_axis_arcmin":0.93,"minor_axis_arcmin":0.58,"wikipedia_article":"NGC 1803","position_angle_deg":61,"surface_brightness":21.62,"radial_velocity_km_s":4075},"designations":[{"catalog":"ESO","designation":"ESO 203-018"},{"catalog":"ESO","designation":"ESO 203-18"},{"catalog":"ESO-LV","designation":"ESO-LV 203-0180"},{"catalog":"IRAS","designation":"IRAS 05041-4938"},{"catalog":"IRAS","designation":"IRAS F05041-4938"},{"catalog":"LEDA","designation":"LEDA 16715"},{"catalog":"NGC","designation":"NGC 1803"},{"catalog":"PGC","designation":"PGC 16715"}],"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."}