{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T06:19:20.401Z","years_from_j2000":26.669,"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-452","name":"NGC 452","class":"barred_spiral_galaxy_sbab","category":"galaxy","object_type":"Barred spiral galaxy SBab","mag":12.59,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":221469492.95091072,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":19.061791666666664,"dec_deg":31.033833333333334,"epoch_ra_deg":19.43421,"epoch_dec_deg":31.175709,"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":"Pisces","discovered":"1827","featured":false,"url":"https://spacecatalog.org/object/ngc-452","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.68,"h_mag":9.86,"j_mag":10.62,"k_mag":9.58,"v_mag":12.59,"redshift":0.01666,"hubble_type":"SBab","wikidata_id":"Q770197","redshift_cmb":0.015668603635642597,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16723241.757774564,16723241.757774564]},"major_axis_arcmin":1.99,"minor_axis_arcmin":0.5,"wikipedia_article":"NGC 452","position_angle_deg":39,"surface_brightness":23.14,"radial_velocity_km_s":4953},"designations":[{"catalog":"2MASS","designation":"2MASS J01161480+3102017"},{"catalog":"2MASX","designation":"2MASX J01161484+3102019"},{"catalog":"IRAS","designation":"IRAS 01134+3046"},{"catalog":"IRAS","designation":"IRAS F01134+3045"},{"catalog":"LEDA","designation":"LEDA 4596"},{"catalog":"MCG","designation":"MCG +05-04-010"},{"catalog":"NGC","designation":"NGC 452"},{"catalog":"PGC","designation":"PGC 4596"},{"catalog":"UGC","designation":"UGC 820"}],"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."}