{"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":"2026-09-07T06:16:56.596Z","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-6951","name":"NGC 6951","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":12.41,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":59188466.29774492,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":309.30870833333336,"dec_deg":66.10563888888888,"epoch_ra_deg":309.387995,"epoch_dec_deg":66.198697,"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":"Cepheus","discovered":"1885","featured":false,"url":"https://spacecatalog.org/object/ngc-6951","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.96,"h_mag":7.47,"j_mag":8.31,"k_mag":7.22,"v_mag":12.41,"redshift":0.00475,"hubble_type":"SABb","wikidata_id":"Q1148735","redshift_cmb":0.00422369380794585,"discovered_by":"Jérôme Eugène Coggia","ngc_type_code":"G","uncertainties":{"distance_ly":[14224415.723063938,14224415.723063938]},"major_axis_arcmin":3.19,"minor_axis_arcmin":2.09,"wikipedia_article":"NGC 6951","position_angle_deg":149,"surface_brightness":22.89,"radial_velocity_km_s":1421},"designations":[{"catalog":"2MASX","designation":"2MASX J20371407+6606203"},{"catalog":"IRAS","designation":"IRAS 20366+6555"},{"catalog":"IRAS","designation":"IRAS F20366+6555"},{"catalog":"LEDA","designation":"LEDA 65086"},{"catalog":"MCG","designation":"MCG +11-25-002"},{"catalog":"NGC","designation":"NGC 6951"},{"catalog":"NGC","designation":"NGC 6952"},{"catalog":"PGC","designation":"PGC 65086"},{"catalog":"UGC","designation":"UGC 11604"}],"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."}