{"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":"2026-09-03T07:57:29.286Z","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-5572","name":"NGC 5572","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":15.04,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":360912738.4779199,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":214.89708333333334,"dec_deg":36.14066666666667,"epoch_ra_deg":215.179961,"epoch_dec_deg":36.016953,"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":"1883","featured":false,"url":"https://spacecatalog.org/object/ngc-5572","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.04,"h_mag":11.83,"j_mag":12.41,"k_mag":11.4,"redshift":0.02475,"hubble_type":"Sb","wikidata_id":"Q1121133","redshift_cmb":0.025351562537853534,"discovered_by":"Édouard Stephan","ngc_type_code":"G","uncertainties":{"distance_ly":[20355688.160340905,20355688.160340905]},"major_axis_arcmin":0.89,"minor_axis_arcmin":0.72,"position_angle_deg":178,"surface_brightness":23.33,"radial_velocity_km_s":7328},"designations":[{"catalog":"IRAS","designation":"IRAS 14174+3622"},{"catalog":"LEDA","designation":"LEDA 51196"},{"catalog":"MCG","designation":"MCG +06-31-099"},{"catalog":"NGC","designation":"NGC 5572"},{"catalog":"PGC","designation":"PGC 51196"},{"catalog":"SDSS","designation":"SDSS J141935.30+360826.4"},{"catalog":"UGC","designation":"UGC 9173"}],"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."}