{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T14:58:53.023Z","years_from_j2000":26.667,"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":"ic-4446","name":"IC 4446","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":15.77,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":458075929.1823546,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":217.25549999999998,"dec_deg":37.46313888888889,"epoch_ra_deg":217.531488,"epoch_dec_deg":37.342988,"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":"Boötes","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-4446","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.77,"h_mag":13.13,"j_mag":13.78,"k_mag":13.05,"redshift":0.03146,"hubble_type":"Sc","wikidata_id":"Q3682695","redshift_cmb":0.03202000817827977,"ngc_type_code":"G","uncertainties":{"distance_ly":[23355728.49523553,23355728.49523553]},"major_axis_arcmin":0.77,"minor_axis_arcmin":0.4,"position_angle_deg":109,"surface_brightness":23.46,"radial_velocity_km_s":9283},"designations":[{"catalog":"2MASX","designation":"2MASX J14290128+3727473"},{"catalog":"IC","designation":"IC 4446"},{"catalog":"LEDA","designation":"LEDA 51742"},{"catalog":"MCG","designation":"MCG +06-32-044"},{"catalog":"PGC","designation":"PGC 51742"},{"catalog":"SDSS","designation":"SDSS J142901.31+372747.2"},{"catalog":"SDSS","designation":"SDSS J142901.31+372747.3"},{"catalog":"SDSS","designation":"SDSS J142901.32+372747.3"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}