{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T14:53:45.571Z","years_from_j2000":26.678,"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":"ngc3405-ned02","name":"NGC3405 NED02","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":15.56,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":308988789.6134494,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":162.43483333333333,"dec_deg":16.242194444444447,"epoch_ra_deg":162.792583,"epoch_dec_deg":16.100173,"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":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ngc3405-ned02","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.56,"redshift":0.02061,"hubble_type":"E-S0","redshift_cmb":0.021761780369232042,"ngc_type_code":"G","uncertainties":{"distance_ly":[18889960.8983848,18889960.8983848]},"major_axis_arcmin":0.66,"minor_axis_arcmin":0.5,"position_angle_deg":95,"surface_brightness":23.41,"radial_velocity_km_s":6115},"designations":[{"catalog":"MCG","designation":"MCG +03-28-015"},{"catalog":"OpenNGC","designation":"NGC3405 NED02"},{"catalog":"PGC","designation":"PGC 32418"},{"catalog":"SDSS","designation":"SDSS J104944.35+161431.8"},{"catalog":"SDSS","designation":"SDSS J104944.36+161431.9"},{"catalog":"UGC","designation":"UGC 05933 NED02"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}