{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:46:30.108Z","years_from_j2000":26.685,"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-1547","name":"NGC 1547","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":14.39,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":453224834.1185538,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":64.30170833333334,"dec_deg":-17.857472222222224,"epoch_ra_deg":64.602913,"epoch_dec_deg":-17.790877,"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":"Eridanus","discovered":"1885","featured":false,"url":"https://spacecatalog.org/object/ngc-1547","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.39,"h_mag":10.78,"j_mag":11.53,"k_mag":10.45,"redshift":0.031925,"hubble_type":"Sbc","wikidata_id":"Q1043970","redshift_cmb":0.03168855775884327,"discovered_by":"Francis Preserved Leavenworth","ngc_type_code":"G","uncertainties":{"distance_ly":[23199492.70409425,23199492.70409425]},"major_axis_arcmin":1.4,"minor_axis_arcmin":0.58,"position_angle_deg":131,"surface_brightness":23.17,"radial_velocity_km_s":9418},"designations":[{"catalog":"2MASX","designation":"2MASX J04171241-1751267"},{"catalog":"ESO","designation":"ESO 550-018"},{"catalog":"ESO","designation":"ESO 550-18"},{"catalog":"ESO-LV","designation":"ESO-LV 550-0180"},{"catalog":"IRAS","designation":"IRAS 04149-1758"},{"catalog":"LEDA","designation":"LEDA 14794"},{"catalog":"LEDA","designation":"LEDA 14799"},{"catalog":"MCG","designation":"MCG -03-11-020"},{"catalog":"NGC","designation":"NGC 1547"},{"catalog":"PGC","designation":"PGC 14794"},{"catalog":"PGC","designation":"PGC 14799"}],"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."}