{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T10:29:34.627Z","years_from_j2000":26.675,"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-3378","name":"NGC 3378","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":13.46,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":247177264.26504597,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":161.68029166666668,"dec_deg":-40.01602777777778,"epoch_ra_deg":161.983318,"epoch_dec_deg":-40.15737,"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":"Antlia","discovered":"1835","featured":false,"url":"https://spacecatalog.org/object/ngc-3378","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.46,"h_mag":9.86,"j_mag":10.57,"k_mag":9.6,"redshift":0.016419,"hubble_type":"SABb","wikidata_id":"Q1104461","redshift_cmb":0.017464016663170323,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[17313450.059920583,17313450.059920583]},"major_axis_arcmin":1.5,"minor_axis_arcmin":1.35,"position_angle_deg":93,"surface_brightness":22.99,"radial_velocity_km_s":4882},"designations":[{"catalog":"2MASX","designation":"2MASX J10464327-4000576"},{"catalog":"ESO","designation":"ESO 318-012"},{"catalog":"ESO","designation":"ESO 318-12"},{"catalog":"ESO-LV","designation":"ESO-LV 318-0120"},{"catalog":"IRAS","designation":"IRAS 10444-3945"},{"catalog":"IRAS","designation":"IRAS F10444-3945"},{"catalog":"LEDA","designation":"LEDA 32189"},{"catalog":"MCG","designation":"MCG -07-22-029"},{"catalog":"NGC","designation":"NGC 3378"},{"catalog":"PGC","designation":"PGC 32189"}],"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."}