{"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":"2026-09-07T00:58:26.378Z","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-2552","name":"NGC 2552","class":"intermediate_spiral_galaxy_sabm","category":"galaxy","object_type":"Intermediate spiral galaxy SABm","mag":12.25,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":124.83554166666666,"dec_deg":50.00963888888889,"epoch_ra_deg":125.327048,"epoch_dec_deg":49.925555,"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":"Lynx","discovered":"1788","featured":false,"url":"https://spacecatalog.org/object/ngc-2552","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.69,"h_mag":13.86,"j_mag":14.52,"k_mag":13.61,"v_mag":12.25,"hubble_type":"SABm","wikidata_id":"Q764512","discovered_by":"William Herschel","ngc_type_code":"G","major_axis_arcmin":2.99,"minor_axis_arcmin":1.61,"wikipedia_article":"NGC 2552","position_angle_deg":60,"surface_brightness":23.26},"designations":[{"catalog":"2MASX","designation":"2MASX J08192055+5000351"},{"catalog":"IRAS","designation":"IRAS 08156+5009"},{"catalog":"IRAS","designation":"IRAS F08156+5010"},{"catalog":"LEDA","designation":"LEDA 23340"},{"catalog":"LEDA","designation":"LEDA 3132065"},{"catalog":"MCG","designation":"MCG +08-15-062"},{"catalog":"NGC","designation":"NGC 2552"},{"catalog":"PGC","designation":"PGC 23340"},{"catalog":"PGC","designation":"PGC 3132065"},{"catalog":"SDSS","designation":"SDSS J081920.52+500034.5"},{"catalog":"SDSS","designation":"SDSS J081920.53+500034.6"},{"catalog":"SDSS","designation":"SDSS J081920.53+500034.7"},{"catalog":"UGC","designation":"UGC 4325"}],"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."}