{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T21:34:56.558Z","years_from_j2000":26.665,"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-48","name":"NGC 48","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":14.93,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":224035222.87349075,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":3.509125,"dec_deg":48.234861111111115,"epoch_ra_deg":3.861283,"epoch_dec_deg":48.384158,"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":"Andromeda","discovered":"1885","featured":false,"url":"https://spacecatalog.org/object/ngc-48","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.93,"h_mag":10.75,"j_mag":11.39,"k_mag":10.4,"redshift":0.01676,"hubble_type":"SABb","wikidata_id":"Q49685","redshift_cmb":0.015848004486363587,"discovered_by":"Lewis A. Swift","ngc_type_code":"G","uncertainties":{"distance_ly":[16780209.891764756,16780209.891764756]},"major_axis_arcmin":1.34,"minor_axis_arcmin":0.61,"wikipedia_article":"NGC 48","position_angle_deg":15,"surface_brightness":23.59,"radial_velocity_km_s":4983},"designations":[{"catalog":"2MASX","designation":"2MASX J00140221+4814055"},{"catalog":"IRAS","designation":"IRAS 00113+4757"},{"catalog":"LEDA","designation":"LEDA 929"},{"catalog":"MCG","designation":"MCG +08-01-031"},{"catalog":"NGC","designation":"NGC 48"},{"catalog":"PGC","designation":"PGC 929"},{"catalog":"UGC","designation":"UGC 133"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}