{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T05:20:51.421Z","years_from_j2000":26.682,"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":"ngc5591-ned01","name":"NGC5591 NED01","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":13.88,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":374164899.7327225,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":215.63870833333334,"dec_deg":13.717194444444445,"epoch_ra_deg":215.962146,"epoch_dec_deg":13.594537,"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":"Boötes","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ngc5591-ned01","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.56,"h_mag":11.82,"j_mag":12.39,"k_mag":11.49,"v_mag":13.88,"redshift":0.02548,"hubble_type":"Sc","redshift_cmb":0.026264805558378734,"ngc_type_code":"G","uncertainties":{"distance_ly":[20746956.2967253,20746956.2967253]},"major_axis_arcmin":0.85,"minor_axis_arcmin":0.48,"position_angle_deg":79,"surface_brightness":22.47,"radial_velocity_km_s":7541},"designations":[{"catalog":"2MASX","designation":"2MASX J14223326+1343016"},{"catalog":"IRAS","designation":"IRAS 14201+1356"},{"catalog":"MCG","designation":"MCG +02-37-006 NED01"},{"catalog":"OpenNGC","designation":"NGC5591 NED01"},{"catalog":"PGC","designation":"PGC 51360"},{"catalog":"SDSS","designation":"SDSS J142233.28+134301.8"},{"catalog":"SDSS","designation":"SDSS J142233.29+134301.9"},{"catalog":"UGC","designation":"UGC 09207 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."}