{"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":"2026-09-01T05:59:34.461Z","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-4145","name":"IC 4145","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":16.75,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":738318849.6939979,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.957375,"dec_deg":38.28658333333333,"epoch_ra_deg":196.270447,"epoch_dec_deg":38.142353,"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":"Canes Venatici","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-4145","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.75,"h_mag":12.67,"j_mag":13.37,"k_mag":12.33,"redshift":0.05012,"hubble_type":"Sc","wikidata_id":"Q3683901","redshift_cmb":0.05091402453018534,"ngc_type_code":"G","uncertainties":{"distance_ly":[33094809.066356402,33094809.066356402]},"major_axis_arcmin":0.71,"minor_axis_arcmin":0.17,"position_angle_deg":135,"surface_brightness":23.57,"radial_velocity_km_s":14650},"designations":[{"catalog":"2MASX","designation":"2MASX J13034979+3817107"},{"catalog":"IC","designation":"IC 4145"},{"catalog":"LEDA","designation":"LEDA 2122937"},{"catalog":"SDSS","designation":"SDSS J130349.76+381711.6"},{"catalog":"SDSS","designation":"SDSS J130349.77+381711.7"}],"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."}