{"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":"2026-09-04T11:52:49.337Z","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-4597","name":"NGC 4597","class":"spiral_galaxy_sm","category":"galaxy","object_type":"Spiral galaxy Sm","mag":12.87,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":64701099.420253895,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":190.053875,"dec_deg":-5.799277777777777,"epoch_ra_deg":190.400472,"epoch_dec_deg":-5.94682,"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":"Virgo","discovered":"1787","featured":false,"url":"https://spacecatalog.org/object/ngc-4597","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.87,"h_mag":12.04,"j_mag":12.67,"k_mag":11.68,"redshift":0.003468,"hubble_type":"Sm","wikidata_id":"Q1112745","redshift_cmb":0.004615703170908647,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14267423.54957609,14267423.54957609]},"major_axis_arcmin":3.55,"minor_axis_arcmin":1.42,"position_angle_deg":70,"surface_brightness":23.55,"radial_velocity_km_s":1038},"designations":[{"catalog":"2MASX","designation":"2MASX J12401293-0547574"},{"catalog":"IRAS","designation":"IRAS 12376-0531"},{"catalog":"IRAS","designation":"IRAS F12376-0531"},{"catalog":"LEDA","designation":"LEDA 42429"},{"catalog":"MCG","designation":"MCG -01-32-034"},{"catalog":"NGC","designation":"NGC 4597"},{"catalog":"PGC","designation":"PGC 42429"}],"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."}