{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T15:45:52.751Z","years_from_j2000":26.686,"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-3366","name":"NGC 3366","class":"barred_spiral_galaxy_sbb","category":"galaxy","object_type":"Barred spiral galaxy SBb","mag":11.71,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":151029091.17942327,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":158.7845,"dec_deg":-43.691805555555554,"epoch_ra_deg":159.075225,"epoch_dec_deg":-43.83057,"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":"Vela","discovered":"1836","featured":false,"url":"https://spacecatalog.org/object/ngc-3366","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.09,"v_mag":11.71,"redshift":0.009738,"hubble_type":"SBb","wikidata_id":"Q1104427","redshift_cmb":0.010724678525221742,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15349502.643936267,15349502.643936267]},"major_axis_arcmin":2.72,"minor_axis_arcmin":1.31,"position_angle_deg":36,"surface_brightness":22.47,"radial_velocity_km_s":2905},"designations":[{"catalog":"ESO","designation":"ESO 264-007"},{"catalog":"ESO","designation":"ESO 264-7"},{"catalog":"ESO-LV","designation":"ESO-LV 264-0070"},{"catalog":"IC","designation":"IC 2592"},{"catalog":"IRAS","designation":"IRAS 10329-4325"},{"catalog":"LEDA","designation":"LEDA 31335"},{"catalog":"MCG","designation":"MCG -07-22-024"},{"catalog":"NGC","designation":"NGC 3366"},{"catalog":"PGC","designation":"PGC 31335"}],"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."}