{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T02:23:55.343Z","years_from_j2000":26.679,"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":"ngc4015-ned01","name":"NGC4015 NED01","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":14.08,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":219315884.5827643,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":179.6775,"dec_deg":25.036611111111114,"epoch_ra_deg":180.022933,"epoch_dec_deg":24.887069,"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/ngc4015-ned01","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.08,"h_mag":10.16,"j_mag":10.84,"k_mag":9.94,"redshift":0.01448,"hubble_type":"E-S0","redshift_cmb":0.015517982703582511,"ngc_type_code":"G","uncertainties":{"distance_ly":[16675768.175461654,16675768.175461654]},"major_axis_arcmin":1.62,"minor_axis_arcmin":1.26,"position_angle_deg":156,"surface_brightness":23.7,"radial_velocity_km_s":4310},"designations":[{"catalog":"2MASX","designation":"2MASX J11584264+2502123"},{"catalog":"MCG","designation":"MCG +04-28-109"},{"catalog":"OpenNGC","designation":"NGC4015 NED01"},{"catalog":"SDSS","designation":"SDSS J115842.60+250211.8"},{"catalog":"UGC","designation":"UGC 06965 NED01"}],"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."}