{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:49:04.268Z","years_from_j2000":26.671,"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-336","name":"NGC 336","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":15.48,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":211796812.3468986,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":14.511791666666667,"dec_deg":-18.384333333333334,"epoch_ra_deg":14.84402,"epoch_dec_deg":-18.239148,"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":"Cetus","discovered":"1886","featured":false,"url":"https://spacecatalog.org/object/ngc-336","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.48,"h_mag":13.13,"j_mag":13.55,"k_mag":12.43,"redshift":0.016,"hubble_type":"S0-a","wikidata_id":"Q605004","redshift_cmb":0.014991846230034245,"discovered_by":"Francis Preserved Leavenworth","ngc_type_code":"G","uncertainties":{"distance_ly":[16512521.526996765,16512521.526996765]},"major_axis_arcmin":0.75,"minor_axis_arcmin":0.3,"wikipedia_article":"NGC 336","position_angle_deg":38,"surface_brightness":23.5,"radial_velocity_km_s":4758},"designations":[{"catalog":"2MASX","designation":"2MASX J00580282-1823032"},{"catalog":"ESO","designation":"ESO 541-002"},{"catalog":"ESO","designation":"ESO 541-4"},{"catalog":"ESO-LV","designation":"ESO-LV 541-0020"},{"catalog":"IRAS","designation":"IRAS 00555-1839"},{"catalog":"IRAS","designation":"IRAS F00565-1900"},{"catalog":"LEDA","designation":"LEDA 3526"},{"catalog":"NGC","designation":"NGC 336"},{"catalog":"PGC","designation":"PGC 3470"},{"catalog":"PGC","designation":"PGC 3526"}],"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."}