{"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":"2026-09-05T16:36:51.713Z","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-3359","name":"NGC 3359","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":10.55,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":53087577.09352396,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":161.65358333333336,"dec_deg":63.224222222222224,"epoch_ra_deg":162.093959,"epoch_dec_deg":63.082816,"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":"Ursa Major","discovered":"1793","featured":false,"url":"https://spacecatalog.org/object/ngc-3359","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.07,"h_mag":8.73,"j_mag":9.44,"k_mag":8.62,"v_mag":10.55,"redshift":0.003373,"hubble_type":"Sc","wikidata_id":"Q1104397","redshift_cmb":0.003789582190953933,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14180718.613480283,14180718.613480283]},"major_axis_arcmin":4.07,"minor_axis_arcmin":2.83,"wikipedia_article":"NGC 3359","position_angle_deg":167,"surface_brightness":22.55,"radial_velocity_km_s":1009},"designations":[{"catalog":"2MASX","designation":"2MASX J10463684+6313251"},{"catalog":"IRAS","designation":"IRAS 10433+6329"},{"catalog":"IRAS","designation":"IRAS F10433+6329"},{"catalog":"LEDA","designation":"LEDA 32183"},{"catalog":"MCG","designation":"MCG +11-13-037"},{"catalog":"NGC","designation":"NGC 3359"},{"catalog":"PGC","designation":"PGC 32183"},{"catalog":"SDSS","designation":"SDSS J104636.85+631327.2"},{"catalog":"SDSS","designation":"SDSS J104636.86+631327.2"},{"catalog":"UGC","designation":"UGC 5873"}],"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."}