{"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":"2026-09-07T03:06:16.803Z","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":"ngc-5618","name":"NGC 5618","class":"barred_spiral_galaxy_sbc","category":"galaxy","object_type":"Barred spiral galaxy SBc","mag":13.4,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":350457600.16981685,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":216.79920833333333,"dec_deg":-2.2624166666666667,"epoch_ra_deg":217.147021,"epoch_dec_deg":-2.383294,"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":"1789","featured":false,"url":"https://spacecatalog.org/object/ngc-5618","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.14,"h_mag":10.98,"j_mag":11.68,"k_mag":10.5,"v_mag":13.4,"redshift":0.0238,"hubble_type":"SBc","wikidata_id":"Q1121474","redshift_cmb":0.02463022784613078,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[20051638.94129751,20051638.94129751]},"major_axis_arcmin":1.45,"minor_axis_arcmin":0.78,"position_angle_deg":4,"surface_brightness":23.18,"radial_velocity_km_s":7050},"designations":[{"catalog":"2MASX","designation":"2MASX J14271179-0215448"},{"catalog":"LEDA","designation":"LEDA 51603"},{"catalog":"MCG","designation":"MCG +00-37-005"},{"catalog":"NGC","designation":"NGC 5618"},{"catalog":"PGC","designation":"PGC 51603"},{"catalog":"SDSS","designation":"SDSS J142711.81-021544.6"},{"catalog":"SDSS","designation":"SDSS J142711.81-021544.7"},{"catalog":"UGC","designation":"UGC 9250"}],"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."}