{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T00:09:43.105Z","years_from_j2000":26.674,"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-3285a","name":"NGC 3285A","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":13.84,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":186717227.3789911,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":158.20325,"dec_deg":-27.522444444444442,"epoch_ra_deg":158.517398,"epoch_dec_deg":-27.660563,"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":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ngc-3285a","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.5,"h_mag":11.12,"j_mag":11.99,"k_mag":11.22,"v_mag":13.84,"redshift":0.012081,"hubble_type":"Sc","wikidata_id":"Q1104052","redshift_cmb":0.013233989724722228,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15997443.943108534,15997443.943108534]},"major_axis_arcmin":1.21,"minor_axis_arcmin":0.87,"position_angle_deg":174,"surface_brightness":23.33,"radial_velocity_km_s":3600},"designations":[{"catalog":"2MASX","designation":"2MASX J10324878-2731209"},{"catalog":"ESO","designation":"ESO 501-008"},{"catalog":"ESO","designation":"ESO 501-8"},{"catalog":"ESO-LV","designation":"ESO-LV 501-0080"},{"catalog":"LEDA","designation":"LEDA 31161"},{"catalog":"MCG","designation":"MCG -04-25-015"},{"catalog":"NGC","designation":"NGC 3285A"},{"catalog":"PGC","designation":"PGC 31161"}],"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."}