{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T02:10:29.407Z","years_from_j2000":26.679,"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-1575","name":"NGC 1575","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":13.43,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":441578505.3565257,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":66.58562500000001,"dec_deg":-10.098444444444445,"epoch_ra_deg":66.905575,"epoch_dec_deg":-10.037297,"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-1575","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.43,"redshift":0.03111,"hubble_type":"SABb","wikidata_id":"Q1266567","redshift_cmb":0.03089219221235906,"discovered_by":"Lewis A. Swift","ngc_type_code":"G","uncertainties":{"distance_ly":[22826868.457216315,22826868.457216315]},"major_axis_arcmin":1.52,"minor_axis_arcmin":1.16,"position_angle_deg":115,"surface_brightness":22.86,"radial_velocity_km_s":9181},"designations":[{"catalog":"2MASX","designation":"2MASX J04262054-1005543"},{"catalog":"IRAS","designation":"IRAS 04239-1012"},{"catalog":"IRAS","designation":"IRAS F04239-1012"},{"catalog":"LEDA","designation":"LEDA 15090"},{"catalog":"LEDA","designation":"LEDA 15092"},{"catalog":"MCG","designation":"MCG -02-12-014"},{"catalog":"NGC","designation":"NGC 1575"},{"catalog":"NGC","designation":"NGC 1577"},{"catalog":"PGC","designation":"PGC 15090"},{"catalog":"PGC","designation":"PGC 15092"}],"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."}