{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T21:50:52.887Z","years_from_j2000":26.676,"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-3027","name":"NGC 3027","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":11.76,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":52511336.079850964,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":148.91916666666665,"dec_deg":72.20355555555555,"epoch_ra_deg":149.506901,"epoch_dec_deg":72.076277,"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":"Ursa Major","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-3027","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.18,"h_mag":11.06,"j_mag":11.52,"k_mag":10.84,"v_mag":11.76,"redshift":0.003536,"hubble_type":"Sc","wikidata_id":"Q1102559","redshift_cmb":0.0037485647674078137,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14176804.458016165,14176804.458016165]},"major_axis_arcmin":3.35,"minor_axis_arcmin":1.27,"position_angle_deg":128,"surface_brightness":22.73,"radial_velocity_km_s":1058},"designations":[{"catalog":"2MASX","designation":"2MASX J09554063+7212128"},{"catalog":"IRAS","designation":"IRAS 09513+7226"},{"catalog":"IRAS","designation":"IRAS F09513+7226"},{"catalog":"LEDA","designation":"LEDA 28636"},{"catalog":"MCG","designation":"MCG +12-10-009"},{"catalog":"NGC","designation":"NGC 3027"},{"catalog":"PGC","designation":"PGC 28636"},{"catalog":"UGC","designation":"UGC 5316"}],"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."}