{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T04:16:03.576Z","years_from_j2000":26.666,"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-756","name":"IC 756","class":"barred_spiral_galaxy_sbc","category":"galaxy","object_type":"Barred spiral galaxy SBc","mag":17.54,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":312162195.1075326,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":180.740875,"dec_deg":4.845861111111111,"epoch_ra_deg":181.084847,"epoch_dec_deg":4.696384,"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":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-756","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.52,"h_mag":10.75,"j_mag":11.48,"k_mag":10.48,"v_mag":17.54,"redshift":0.02078,"hubble_type":"SBc","wikidata_id":"Q3711934","redshift_cmb":0.021981707526047778,"ngc_type_code":"G","uncertainties":{"distance_ly":[18976177.978852905,18976177.978852905]},"major_axis_arcmin":1.7,"minor_axis_arcmin":0.7,"position_angle_deg":99,"surface_brightness":23.75,"radial_velocity_km_s":6165},"designations":[{"catalog":"2MASX","designation":"2MASX J12025779+0450449"},{"catalog":"IC","designation":"IC 756"},{"catalog":"IRAS","designation":"IRAS F12003+0507"},{"catalog":"LEDA","designation":"LEDA 38054"},{"catalog":"MCG","designation":"MCG +01-31-015"},{"catalog":"PGC","designation":"PGC 38054"},{"catalog":"SDSS","designation":"SDSS J120257.80+045045.0"},{"catalog":"SDSS","designation":"SDSS J120257.81+045045.0"},{"catalog":"SDSS","designation":"SDSS J120257.81+045045.1"},{"catalog":"UGC","designation":"UGC 7026"}],"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."}