{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T11:38:59.649Z","years_from_j2000":26.675,"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-2570","name":"NGC 2570","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":14.67,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":323199919.775533,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":125.34391666666667,"dec_deg":20.910555555555554,"epoch_ra_deg":125.734901,"epoch_dec_deg":20.825514,"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":"Cancer","discovered":"1873","featured":false,"url":"https://spacecatalog.org/object/ngc-2570","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.22,"h_mag":12.21,"j_mag":12.69,"k_mag":11.76,"v_mag":14.67,"redshift":0.02194,"hubble_type":"Sab","wikidata_id":"Q1049791","redshift_cmb":0.02274611465114673,"discovered_by":"Ralph Copeland","ngc_type_code":"G","uncertainties":{"distance_ly":[19279653.314867716,19279653.314867716]},"major_axis_arcmin":0.7,"minor_axis_arcmin":0.37,"position_angle_deg":71,"surface_brightness":22.8,"radial_velocity_km_s":6505},"designations":[{"catalog":"2MASX","designation":"2MASX J08212252+2054375"},{"catalog":"IRAS","designation":"IRAS F08184+2104"},{"catalog":"LEDA","designation":"LEDA 23443"},{"catalog":"MCG","designation":"MCG +04-20-036"},{"catalog":"NGC","designation":"NGC 2570"},{"catalog":"PGC","designation":"PGC 23443"},{"catalog":"SDSS","designation":"SDSS J082122.54+205437.9"},{"catalog":"UGC","designation":"UGC 4354"}],"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."}