{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:05:48.352Z","years_from_j2000":26.654,"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-746","name":"NGC 746","class":"irregular_galaxy_i","category":"galaxy","object_type":"Irregular galaxy I","mag":13.7,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":21239228.389126226,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":29.462541666666667,"dec_deg":44.91858333333333,"epoch_ra_deg":29.878413,"epoch_dec_deg":45.049577,"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":"Andromeda","discovered":"1885","featured":false,"url":"https://spacecatalog.org/object/ngc-746","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.7,"h_mag":10.94,"j_mag":11.49,"k_mag":10.75,"redshift":0.002275,"hubble_type":"I","wikidata_id":"Q1038768","redshift_cmb":0.0015187530412728023,"discovered_by":"Lewis A. Swift","ngc_type_code":"G","uncertainties":{"distance_ly":[14020463.670374012,14020463.670374012]},"major_axis_arcmin":1.82,"minor_axis_arcmin":1.29,"position_angle_deg":86,"surface_brightness":23.43,"radial_velocity_km_s":681},"designations":[{"catalog":"2MASX","designation":"2MASX J01575100+4455069"},{"catalog":"IRAS","designation":"IRAS 01548+4441"},{"catalog":"LEDA","designation":"LEDA 7399"},{"catalog":"MCG","designation":"MCG +07-05-003"},{"catalog":"NGC","designation":"NGC 746"},{"catalog":"PGC","designation":"PGC 7399"},{"catalog":"UGC","designation":"UGC 1438"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}