{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T16:05:33.300Z","years_from_j2000":26.675,"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-5170","name":"NGC 5170","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":11.23,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":85080812.22208008,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":202.45329166666664,"dec_deg":-17.966416666666667,"epoch_ra_deg":202.815447,"epoch_dec_deg":-18.105297,"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":"Virgo","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-5170","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.07,"h_mag":7.95,"j_mag":8.7,"k_mag":7.63,"v_mag":11.23,"redshift":0.005052,"hubble_type":"Sc","wikidata_id":"Q1117466","redshift_cmb":0.006062919198854599,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14454939.067763176,14454939.067763176]},"major_axis_arcmin":7.96,"minor_axis_arcmin":1.41,"wikipedia_article":"NGC 5170","position_angle_deg":123,"surface_brightness":23.95,"radial_velocity_km_s":1511},"designations":[{"catalog":"2MASX","designation":"2MASX J13294883-1757593"},{"catalog":"ESO","designation":"ESO 576-065"},{"catalog":"ESO","designation":"ESO 576-65"},{"catalog":"ESO-LV","designation":"ESO-LV 576-0650"},{"catalog":"IRAS","designation":"IRAS 13271-1742"},{"catalog":"LEDA","designation":"LEDA 47394"},{"catalog":"LEDA","designation":"LEDA 47396"},{"catalog":"MCG","designation":"MCG -03-34-084"},{"catalog":"NGC","designation":"NGC 5170"},{"catalog":"PGC","designation":"PGC 47394"},{"catalog":"PGC","designation":"PGC 47396"},{"catalog":"UGCA","designation":"UGCA 360"}],"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."}