{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T09:33:52.366Z","years_from_j2000":26.672,"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":"ngc-4407","name":"NGC 4407","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":12.25,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":186.634375,"dec_deg":12.610972222222221,"epoch_ra_deg":186.974989,"epoch_dec_deg":12.462265,"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":"Virgo","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-4407","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.81,"h_mag":10.11,"j_mag":10.63,"k_mag":9.79,"v_mag":12.25,"redshift":0.00029,"hubble_type":"Sab","wikidata_id":"Q1175045","redshift_cmb":0.0013897182349884574,"discovered_by":"William Herschel","ngc_type_code":"G","major_axis_arcmin":2.08,"minor_axis_arcmin":1.46,"position_angle_deg":53,"surface_brightness":22.91,"radial_velocity_km_s":87},"designations":[{"catalog":"2MASX","designation":"2MASX J12263225+1236390"},{"catalog":"IRAS","designation":"IRAS 12239+1253"},{"catalog":"IRAS","designation":"IRAS F12239+1253"},{"catalog":"LEDA","designation":"LEDA 40705"},{"catalog":"MCG","designation":"MCG +02-32-049"},{"catalog":"NGC","designation":"NGC 4407"},{"catalog":"NGC","designation":"NGC 4413"},{"catalog":"PGC","designation":"PGC 40705"},{"catalog":"SDSS","designation":"SDSS J122632.24+123638.3"},{"catalog":"UGC","designation":"UGC 7538"}],"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."}