{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T16:23:17.148Z","years_from_j2000":26.684,"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-1153","name":"NGC 1153","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":13.46,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":137418452.83745295,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":44.542833333333334,"dec_deg":3.3619166666666667,"epoch_ra_deg":44.893281,"epoch_dec_deg":3.469828,"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":"Cetus","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-1153","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.46,"h_mag":9.34,"j_mag":10.04,"k_mag":9.07,"redshift":0.010454,"hubble_type":"S0-a","wikidata_id":"Q1041862","redshift_cmb":0.009765219971304528,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15131071.60601734,15131071.60601734]},"major_axis_arcmin":1.23,"minor_axis_arcmin":0.85,"wikipedia_article":"NGC 1153","position_angle_deg":53,"surface_brightness":22.8,"radial_velocity_km_s":3118},"designations":[{"catalog":"2MASX","designation":"2MASX J02581028+0321429"},{"catalog":"LEDA","designation":"LEDA 11230"},{"catalog":"MCG","designation":"MCG +00-08-059"},{"catalog":"NGC","designation":"NGC 1153"},{"catalog":"PGC","designation":"PGC 11230"},{"catalog":"UGC","designation":"UGC 2439"}],"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."}