{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T07:38:16.181Z","years_from_j2000":26.666,"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":"ic-4441","name":"IC 4441","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":11.84,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":101774430.62394191,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":217.91091666666668,"dec_deg":-43.41844444444444,"epoch_ra_deg":218.340667,"epoch_dec_deg":-43.537449,"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":"Lupus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-4441","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.11,"h_mag":8.86,"j_mag":9.54,"k_mag":8.6,"v_mag":11.84,"redshift":0.006567,"hubble_type":"SABb","wikidata_id":"Q3682793","redshift_cmb":0.007246034833728432,"ngc_type_code":"G","uncertainties":{"distance_ly":[14641063.074366711,14641063.074366711]},"major_axis_arcmin":1.95,"minor_axis_arcmin":1.53,"wikipedia_article":"IC 4441","position_angle_deg":83,"surface_brightness":22.1,"radial_velocity_km_s":1962},"designations":[{"catalog":"2MASX","designation":"2MASX J14313860-4325060"},{"catalog":"ESO","designation":"ESO 272-014"},{"catalog":"ESO","designation":"ESO 272-11"},{"catalog":"ESO","designation":"ESO 272-14"},{"catalog":"ESO-LV","designation":"ESO-LV 272-0140"},{"catalog":"IC","designation":"IC 4441"},{"catalog":"IC","designation":"IC 4444"},{"catalog":"IRAS","designation":"IRAS 14271-4320"},{"catalog":"IRAS","designation":"IRAS 14284-4311"},{"catalog":"IRAS","designation":"IRAS F14284-4311"},{"catalog":"LEDA","designation":"LEDA 51825"},{"catalog":"LEDA","designation":"LEDA 51905"},{"catalog":"MCG","designation":"MCG -07-30-002"},{"catalog":"PGC","designation":"PGC 51825"},{"catalog":"PGC","designation":"PGC 51905"}],"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."}