{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T00:00:25.149Z","years_from_j2000":26.674,"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":"ic-3253","name":"IC 3253","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":12.12,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":142045630.6730804,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":185.93841666666665,"dec_deg":-34.622194444444446,"epoch_ra_deg":186.291938,"epoch_dec_deg":-34.771088,"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":"Centaurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-3253","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.62,"h_mag":9.38,"j_mag":10.08,"k_mag":9.11,"v_mag":12.12,"redshift":0.009039,"hubble_type":"Sc","wikidata_id":"Q941177","redshift_cmb":0.010091558501513331,"ngc_type_code":"G","uncertainties":{"distance_ly":[15203466.164856896,15203466.164856896]},"major_axis_arcmin":3.02,"minor_axis_arcmin":1.2,"position_angle_deg":24,"surface_brightness":22.99,"radial_velocity_km_s":2698},"designations":[{"catalog":"2MASX","designation":"2MASX J12234523-3437198"},{"catalog":"ESO","designation":"ESO 380-024"},{"catalog":"ESO","designation":"ESO 380-24"},{"catalog":"ESO-LV","designation":"ESO-LV 380-0240"},{"catalog":"IC","designation":"IC 3253"},{"catalog":"IRAS","designation":"IRAS 12211-3420"},{"catalog":"IRAS","designation":"IRAS F12211-3420"},{"catalog":"LEDA","designation":"LEDA 40265"},{"catalog":"MCG","designation":"MCG -06-27-021"},{"catalog":"PGC","designation":"PGC 40265"}],"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."}