{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:46:24.308Z","years_from_j2000":26.685,"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-5875","name":"NGC 5875","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":13.34,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":168643083.56209242,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":227.30483333333333,"dec_deg":52.528444444444446,"epoch_ra_deg":227.50775,"epoch_dec_deg":52.425504,"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":"Boötes","discovered":"1788","featured":false,"url":"https://spacecatalog.org/object/ngc-5875","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.34,"h_mag":9.7,"j_mag":10.47,"k_mag":9.43,"redshift":0.0117,"hubble_type":"Sb","wikidata_id":"Q1123733","redshift_cmb":0.0119643216356915,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15656163.366994739,15656163.366994739]},"major_axis_arcmin":2.42,"minor_axis_arcmin":1.08,"wikipedia_article":"NGC 5875","position_angle_deg":143,"surface_brightness":23.47,"radial_velocity_km_s":3487},"designations":[{"catalog":"2MASX","designation":"2MASX J15091320+5231418"},{"catalog":"IRAS","designation":"IRAS 15077+5243"},{"catalog":"IRAS","designation":"IRAS F15077+5243"},{"catalog":"LEDA","designation":"LEDA 54095"},{"catalog":"MCG","designation":"MCG +09-25-027"},{"catalog":"NGC","designation":"NGC 5875"},{"catalog":"PGC","designation":"PGC 54095"},{"catalog":"SDSS","designation":"SDSS J150913.16+523142.3"},{"catalog":"SDSS","designation":"SDSS J150913.16+523142.4"},{"catalog":"SDSS","designation":"SDSS J150913.16+523142.6"},{"catalog":"UGC","designation":"UGC 9745"}],"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."}