{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T16:38:56.755Z","years_from_j2000":26.678,"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-3015","name":"NGC 3015","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":14.27,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":375864925.80626106,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":147.3455,"dec_deg":1.1454166666666665,"epoch_ra_deg":147.691217,"epoch_dec_deg":1.0205,"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":"Sextans","discovered":"1864","featured":false,"url":"https://spacecatalog.org/object/ngc-3015","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.27,"h_mag":10.84,"j_mag":11.62,"k_mag":10.57,"redshift":0.02521,"hubble_type":"S0-a","wikidata_id":"Q1102466","redshift_cmb":0.026381872946898755,"discovered_by":"Albert Marth","ngc_type_code":"G","uncertainties":{"distance_ly":[20797607.776864607,20797607.776864607]},"major_axis_arcmin":0.53,"minor_axis_arcmin":0.4,"wikipedia_article":"NGC 3015","position_angle_deg":92,"surface_brightness":21.66,"radial_velocity_km_s":7463},"designations":[{"catalog":"2MASX","designation":"2MASX J09492289+0108437"},{"catalog":"IRAS","designation":"IRAS 09468+0122"},{"catalog":"IRAS","designation":"IRAS F09468+0122"},{"catalog":"LEDA","designation":"LEDA 28240"},{"catalog":"MCG","designation":"MCG +00-25-020"},{"catalog":"NGC","designation":"NGC 3015"},{"catalog":"PGC","designation":"PGC 28240"},{"catalog":"SDSS","designation":"SDSS J094922.91+010843.3"},{"catalog":"SDSS","designation":"SDSS J094922.91+010843.5"},{"catalog":"SDSS","designation":"SDSS J094922.92+010843.4"},{"catalog":"SDSS","designation":"SDSS J094922.92+010843.5"},{"catalog":"UGC","designation":"UGC 5261"}],"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."}