{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T18:26:05.884Z","years_from_j2000":26.665,"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-1757","name":"IC 1757","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":16.74,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":1172787610.3576074,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":29.297333333333334,"dec_deg":-0.47397222222222224,"epoch_ra_deg":29.640795,"epoch_dec_deg":-0.34271,"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":null,"featured":false,"url":"https://spacecatalog.org/object/ic-1757","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.74,"h_mag":13.04,"j_mag":13.74,"k_mag":12.76,"redshift":0.08029,"hubble_type":"E","redshift_cmb":0.0792983979294466,"ngc_type_code":"G","uncertainties":{"distance_ly":[49510339.14902325,49510339.14902325]},"major_axis_arcmin":0.4,"minor_axis_arcmin":0.24,"position_angle_deg":55,"surface_brightness":23.65,"radial_velocity_km_s":23107},"designations":[{"catalog":"2MASX","designation":"2MASX J01571138-0028262"},{"catalog":"IC","designation":"IC 1757"},{"catalog":"PGC","designation":"PGC 174458"},{"catalog":"SDSS","designation":"SDSS J015711.35-002826.3"},{"catalog":"SDSS","designation":"SDSS J015711.36-002826.3"},{"catalog":"SDSS","designation":"SDSS J015711.36-002826.4"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}