{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T12:57:27.926Z","years_from_j2000":26.667,"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-902","name":"NGC 902","class":"barred_spiral_galaxy_sbbc","category":"galaxy","object_type":"Barred spiral galaxy SBbc","mag":14.82,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":322130031.8092708,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":35.59066666666667,"dec_deg":-16.679055555555557,"epoch_ra_deg":35.909151,"epoch_dec_deg":-16.556403,"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":"Cetus","discovered":"1885","featured":false,"url":"https://spacecatalog.org/object/ngc-902","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.82,"h_mag":12.28,"j_mag":13.09,"k_mag":11.66,"redshift":0.023437,"hubble_type":"SBbc","wikidata_id":"Q1040092","redshift_cmb":0.022672057401210033,"discovered_by":"Francis Preserved Leavenworth","ngc_type_code":"G","uncertainties":{"distance_ly":[19249997.545535147,19249997.545535147]},"major_axis_arcmin":0.74,"minor_axis_arcmin":0.55,"wikipedia_article":"NGC 902","position_angle_deg":26,"surface_brightness":22.66,"radial_velocity_km_s":6944},"designations":[{"catalog":"2MASX","designation":"2MASX J02222174-1640447"},{"catalog":"IRAS","designation":"IRAS F02199-1654"},{"catalog":"LEDA","designation":"LEDA 9021"},{"catalog":"MCG","designation":"MCG -03-07-005"},{"catalog":"NGC","designation":"NGC 902"},{"catalog":"PGC","designation":"PGC 9021"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}