{"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":"2026-09-04T06:56:19.562Z","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-5002","name":"NGC 5002","class":"spiral_galaxy_sm","category":"galaxy","object_type":"Spiral galaxy Sm","mag":14.65,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":60671077.00609978,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":197.658375,"dec_deg":36.633916666666664,"epoch_ra_deg":197.970158,"epoch_dec_deg":36.490878,"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":"Canes Venatici","discovered":"1865","featured":false,"url":"https://spacecatalog.org/object/ngc-5002","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.65,"h_mag":13.17,"j_mag":13.55,"k_mag":12.95,"redshift":0.003562,"hubble_type":"Sm","wikidata_id":"Q1116279","redshift_cmb":0.004329146681457452,"discovered_by":"Heinrich Louis d'Arrest","ngc_type_code":"G","uncertainties":{"distance_ly":[14235655.010051606,14235655.010051606]},"major_axis_arcmin":1.39,"minor_axis_arcmin":0.71,"wikipedia_article":"NGC 5002","position_angle_deg":179,"surface_brightness":23.55,"radial_velocity_km_s":1066},"designations":[{"catalog":"2MASX","designation":"2MASX J13103818+3638031"},{"catalog":"LEDA","designation":"LEDA 45728"},{"catalog":"MCG","designation":"MCG +06-29-051"},{"catalog":"NGC","designation":"NGC 5002"},{"catalog":"PGC","designation":"PGC 45728"},{"catalog":"SDSS","designation":"SDSS J131038.00+363802.1"},{"catalog":"SDSS","designation":"SDSS J131038.24+363804.3"},{"catalog":"UGC","designation":"UGC 8254"}],"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."}