{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T17:10:14.507Z","years_from_j2000":26.686,"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":"ngc5421-ned01","name":"NGC5421 NED01","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":14.39,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":386078897.3096713,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":210.42245833333334,"dec_deg":33.82683333333334,"epoch_ra_deg":210.717232,"epoch_dec_deg":33.696848,"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":"Canes Venatici","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ngc5421-ned01","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.39,"h_mag":10.54,"j_mag":11.13,"k_mag":10.24,"redshift":0.0264,"hubble_type":"Sc","redshift_cmb":0.02708481770275495,"ngc_type_code":"G","uncertainties":{"distance_ly":[21104045.14943978,21104045.14943978]},"major_axis_arcmin":1.17,"minor_axis_arcmin":0.68,"position_angle_deg":156,"surface_brightness":23.19,"radial_velocity_km_s":7810},"designations":[{"catalog":"2MASX","designation":"2MASX J14014138+3349363"},{"catalog":"MCG","designation":"MCG +06-31-045 NED01"},{"catalog":"OpenNGC","designation":"NGC5421 NED01"},{"catalog":"SDSS","designation":"SDSS J140141.38+334936.5"},{"catalog":"SDSS","designation":"SDSS J140141.39+334936.5"},{"catalog":"SDSS","designation":"SDSS J140141.39+334936.6"},{"catalog":"UGC","designation":"UGC 08941 NED01"}],"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."}