{"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":"2026-09-01T00:34:25.140Z","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-1204","name":"IC 1204","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":15.3,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":362253811.8900209,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":241.8145,"dec_deg":69.93147222222223,"epoch_ra_deg":241.8016,"epoch_dec_deg":69.858819,"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":"Ursa Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-1204","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.3,"h_mag":11.36,"j_mag":12.08,"k_mag":11.03,"redshift":0.025468,"hubble_type":"Sa","wikidata_id":"Q3710917","redshift_cmb":0.025444033808363464,"ngc_type_code":"G","uncertainties":{"distance_ly":[20394989.377095003,20394989.377095003]},"major_axis_arcmin":0.65,"minor_axis_arcmin":0.3,"position_angle_deg":65,"radial_velocity_km_s":7538},"designations":[{"catalog":"2MASX","designation":"2MASX J16071547+6955533"},{"catalog":"IC","designation":"IC 1204"},{"catalog":"IRAS","designation":"IRAS 16073+7003"},{"catalog":"LEDA","designation":"LEDA 57206"},{"catalog":"MCG","designation":"MCG +12-15-053"},{"catalog":"PGC","designation":"PGC 57206"}],"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."}