{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T11:05:24.998Z","years_from_j2000":26.669,"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-3141","name":"IC 3141","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":15.34,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":364037290.73328894,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":184.7435,"dec_deg":24.18627777777778,"epoch_ra_deg":185.082808,"epoch_dec_deg":24.037157,"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":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-3141","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.34,"h_mag":11.23,"j_mag":12.04,"k_mag":10.88,"redshift":0.024534,"hubble_type":"S0-a","wikidata_id":"Q3687814","redshift_cmb":0.025566991406512196,"ngc_type_code":"G","uncertainties":{"distance_ly":[20447359.61791668,20447359.61791668]},"major_axis_arcmin":0.89,"minor_axis_arcmin":0.51,"position_angle_deg":36,"surface_brightness":23.72,"radial_velocity_km_s":7265},"designations":[{"catalog":"2MASX","designation":"2MASX J12185844+2411105"},{"catalog":"IC","designation":"IC 3141"},{"catalog":"LEDA","designation":"LEDA 39590"},{"catalog":"PGC","designation":"PGC 39590"},{"catalog":"SDSS","designation":"SDSS J121858.41+241110.7"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}