{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T05:35:44.457Z","years_from_j2000":26.663,"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-5653","name":"NGC 5653","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":12.22,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":176457928.82150587,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":217.54341666666667,"dec_deg":31.2155,"epoch_ra_deg":217.833255,"epoch_dec_deg":31.095808,"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":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-5653","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.9,"h_mag":9.5,"j_mag":10.18,"k_mag":9.17,"v_mag":12.22,"redshift":0.011905,"hubble_type":"Sb","wikidata_id":"Q929807","redshift_cmb":0.012513589328310593,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15800515.362979034,15800515.362979034]},"major_axis_arcmin":1.6,"minor_axis_arcmin":1.33,"wikipedia_article":"NGC 5653","position_angle_deg":120,"surface_brightness":22.52,"radial_velocity_km_s":3548},"designations":[{"catalog":"2MASX","designation":"2MASX J14301041+3112558"},{"catalog":"IC","designation":"IC 1026"},{"catalog":"IRAS","designation":"IRAS 14280+3126"},{"catalog":"IRAS","designation":"IRAS F14280+3126"},{"catalog":"LEDA","designation":"LEDA 51814"},{"catalog":"MCG","designation":"MCG +05-34-058"},{"catalog":"NGC","designation":"NGC 5653"},{"catalog":"NGC","designation":"NGC 5653E"},{"catalog":"PGC","designation":"PGC 51814"},{"catalog":"UGC","designation":"UGC 9318"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}