{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T19:21:48.671Z","years_from_j2000":26.678,"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-3221","name":"NGC 3221","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":14.05,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":209515265.79413995,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":155.58325,"dec_deg":21.569583333333334,"epoch_ra_deg":155.952421,"epoch_dec_deg":21.434157,"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":"Leo","discovered":"1862","featured":false,"url":"https://spacecatalog.org/object/ngc-3221","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.05,"h_mag":9.26,"j_mag":10.17,"k_mag":8.87,"redshift":0.01376,"hubble_type":"Sc","wikidata_id":"Q1103624","redshift_cmb":0.014832117838871728,"discovered_by":"Heinrich Louis d'Arrest","ngc_type_code":"G","uncertainties":{"distance_ly":[16463768.152098622,16463768.152098622]},"major_axis_arcmin":1.7,"minor_axis_arcmin":0.76,"position_angle_deg":166,"surface_brightness":23.26,"radial_velocity_km_s":4097},"designations":[{"catalog":"2MASX","designation":"2MASX J10221998+2134105"},{"catalog":"IRAS","designation":"IRAS 10195+2149"},{"catalog":"IRAS","designation":"IRAS F10196+2149"},{"catalog":"LEDA","designation":"LEDA 30358"},{"catalog":"MCG","designation":"MCG +04-25-013"},{"catalog":"NGC","designation":"NGC 3221"},{"catalog":"PGC","designation":"PGC 30358"},{"catalog":"SDSS","designation":"SDSS J102219.83+213406.9"},{"catalog":"UGC","designation":"UGC 5601"}],"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."}