{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T08:04:36.392Z","years_from_j2000":26.68,"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-7184","name":"NGC 7184","class":"barred_spiral_galaxy_sbc","category":"galaxy","object_type":"Barred spiral galaxy SBc","mag":11,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":107960442.27173822,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":330.6659166666667,"dec_deg":-20.812833333333334,"epoch_ra_deg":331.038467,"epoch_dec_deg":-20.683334,"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":"Aquarius","discovered":"1783","featured":false,"url":"https://spacecatalog.org/object/ngc-7184","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.7,"h_mag":7.91,"j_mag":8.73,"k_mag":7.77,"v_mag":11,"redshift":0.008733,"hubble_type":"SBc","wikidata_id":"Q185753","redshift_cmb":0.007683919527440519,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14717235.92911177,14717235.92911177]},"major_axis_arcmin":5.98,"minor_axis_arcmin":1.26,"wikipedia_article":"NGC 7184","position_angle_deg":61,"surface_brightness":23.13,"radial_velocity_km_s":2607},"designations":[{"catalog":"2MASX","designation":"2MASX J22023982-2048461"},{"catalog":"ESO","designation":"ESO 601-009"},{"catalog":"ESO","designation":"ESO 601-9"},{"catalog":"ESO-LV","designation":"ESO-LV 601-0090"},{"catalog":"IRAS","designation":"IRAS 21598-2103"},{"catalog":"IRAS","designation":"IRAS 21599-2103"},{"catalog":"IRAS","designation":"IRAS F21598-2103"},{"catalog":"LEDA","designation":"LEDA 67904"},{"catalog":"MCG","designation":"MCG -04-52-009"},{"catalog":"NGC","designation":"NGC 7184"},{"catalog":"PGC","designation":"PGC 67904"},{"catalog":"UGCA","designation":"UGCA 425"}],"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."}