{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T22:07:31.414Z","years_from_j2000":26.679,"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-6975","name":"NGC 6975","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":14.8,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":276350604.6337297,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":313.1084583333333,"dec_deg":-5.772305555555556,"epoch_ra_deg":313.463699,"epoch_dec_deg":-5.671438,"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":"Aquarius","discovered":"1864","featured":false,"url":"https://spacecatalog.org/object/ngc-6975","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.8,"h_mag":11.77,"j_mag":12.44,"k_mag":11.89,"redshift":0.020501,"hubble_type":"SABb","wikidata_id":"Q1148873","redshift_cmb":0.01949578314166356,"discovered_by":"Albert Marth","ngc_type_code":"G","uncertainties":{"distance_ly":[18031891.52686727,18031891.52686727]},"major_axis_arcmin":1.02,"minor_axis_arcmin":0.92,"wikipedia_article":"NGC 6975","position_angle_deg":165,"surface_brightness":23.5,"radial_velocity_km_s":6083},"designations":[{"catalog":"2MASX","designation":"2MASX J20522602-0546198"},{"catalog":"IRAS","designation":"IRAS F20497-0557"},{"catalog":"LEDA","designation":"LEDA 65620"},{"catalog":"MCG","designation":"MCG -01-53-015"},{"catalog":"NGC","designation":"NGC 6975"},{"catalog":"NGC","designation":"NGC 6976"},{"catalog":"PGC","designation":"PGC 65620"},{"catalog":"SDSS","designation":"SDSS J205226.03-054620.2"},{"catalog":"SDSS","designation":"SDSS J205226.03-054620.3"}],"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."}