{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T21:36:44.783Z","years_from_j2000":26.676,"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-3534","name":"NGC 3534","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":14.04,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":327454535.0944075,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":167.23191666666668,"dec_deg":26.610500000000002,"epoch_ra_deg":167.593425,"epoch_dec_deg":26.465072,"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":"Leo","discovered":"1869","featured":false,"url":"https://spacecatalog.org/object/ngc-3534","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.06,"h_mag":10.77,"j_mag":11.62,"k_mag":10.36,"v_mag":14.04,"redshift":0.02199,"hubble_type":"Sab","wikidata_id":"Q1105227","redshift_cmb":0.02304053948090279,"discovered_by":"Otto Wilhelm von Struve","ngc_type_code":"G","uncertainties":{"distance_ly":[19398083.614291932,19398083.614291932]},"major_axis_arcmin":1.44,"minor_axis_arcmin":0.45,"position_angle_deg":88,"surface_brightness":23.79,"radial_velocity_km_s":6520},"designations":[{"catalog":"2MASX","designation":"2MASX J11085568+2636372"},{"catalog":"IRAS","designation":"IRAS 11062+2652"},{"catalog":"LEDA","designation":"LEDA 33786"},{"catalog":"MCG","designation":"MCG +05-26-062"},{"catalog":"NGC","designation":"NGC 3534"},{"catalog":"NGC","designation":"NGC 3534A"},{"catalog":"PGC","designation":"PGC 33786"},{"catalog":"SDSS","designation":"SDSS J110855.66+263637.8"},{"catalog":"UGC","designation":"UGC 6190"}],"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."}