{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T23:04:04.071Z","years_from_j2000":26.673,"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-5339","name":"NGC 5339","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":12.24,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":139903087.42464432,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":208.501125,"dec_deg":-7.930666666666667,"epoch_ra_deg":208.854992,"epoch_dec_deg":-8.062927,"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":"1887","featured":false,"url":"https://spacecatalog.org/object/ngc-5339","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.82,"h_mag":9.95,"j_mag":10.57,"k_mag":9.7,"v_mag":12.24,"redshift":0.00899,"hubble_type":"Sa","wikidata_id":"Q1118896","redshift_cmb":0.009940472181442228,"discovered_by":"Guillaume Bigourdan","ngc_type_code":"G","uncertainties":{"distance_ly":[15169703.361522041,15169703.361522041]},"major_axis_arcmin":1.82,"minor_axis_arcmin":1.5,"position_angle_deg":85,"surface_brightness":22.77,"radial_velocity_km_s":2683},"designations":[{"catalog":"2MASX","designation":"2MASX J13540027-0755502"},{"catalog":"IRAS","designation":"IRAS 13513-0741"},{"catalog":"IRAS","designation":"IRAS Z13513-0741"},{"catalog":"LEDA","designation":"LEDA 49388"},{"catalog":"MCG","designation":"MCG -01-35-018"},{"catalog":"NGC","designation":"NGC 5339"},{"catalog":"PGC","designation":"PGC 49388"}],"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."}