{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T03:56:23.542Z","years_from_j2000":26.668,"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-337a","name":"NGC 337A","class":"intermediate_spiral_galaxy_sabd","category":"galaxy","object_type":"Intermediate spiral galaxy SABd","mag":12.37,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":35376700.87948199,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":15.39125,"dec_deg":-7.5882499999999995,"epoch_ra_deg":15.730254,"epoch_dec_deg":-7.44364,"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":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ngc-337a","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.9,"v_mag":12.37,"redshift":0.003589,"hubble_type":"SABd","wikidata_id":"Q2630241","redshift_cmb":0.002527738807765356,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14077410.056584777,14077410.056584777]},"major_axis_arcmin":2.63,"minor_axis_arcmin":1.73,"position_angle_deg":8,"surface_brightness":23.37,"radial_velocity_km_s":1074},"designations":[{"catalog":"LEDA","designation":"LEDA 3671"},{"catalog":"MCG","designation":"MCG -01-03-065"},{"catalog":"NGC","designation":"NGC 337A"},{"catalog":"PGC","designation":"PGC 3671"},{"catalog":"SDSS","designation":"SDSS J010133.98-073518.7"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}