{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:57:40.776Z","years_from_j2000":26.654,"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-3601","name":"NGC 3601","class":"barred_spiral_galaxy_sbab","category":"galaxy","object_type":"Barred spiral galaxy SBab","mag":14.25,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":399369833.43018156,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":168.88875,"dec_deg":5.1154166666666665,"epoch_ra_deg":169.235398,"epoch_dec_deg":4.969126,"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":"1865","featured":false,"url":"https://spacecatalog.org/object/ngc-3601","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.25,"h_mag":11.23,"j_mag":11.93,"k_mag":10.89,"redshift":0.02676,"hubble_type":"SBab","wikidata_id":"Q1105555","redshift_cmb":0.027998473356161346,"discovered_by":"Albert Marth","ngc_type_code":"G","uncertainties":{"distance_ly":[21508039.738947295,21508039.738947295]},"major_axis_arcmin":0.51,"minor_axis_arcmin":0.43,"position_angle_deg":17,"surface_brightness":21.41,"radial_velocity_km_s":7915},"designations":[{"catalog":"2MASX","designation":"2MASX J11153331+0506554"},{"catalog":"IRAS","designation":"IRAS 11129+0523"},{"catalog":"LEDA","designation":"LEDA 34335"},{"catalog":"MCG","designation":"MCG +01-29-024"},{"catalog":"NGC","designation":"NGC 3601"},{"catalog":"PGC","designation":"PGC 34335"},{"catalog":"SDSS","designation":"SDSS J111533.30+050655.5"},{"catalog":"UGC","designation":"UGC 6282"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}