{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T07:31:21.820Z","years_from_j2000":26.68,"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-5104","name":"NGC 5104","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":14.28,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":276008313.45671225,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":200.34620833333332,"dec_deg":0.34238888888888885,"epoch_ra_deg":200.690166,"epoch_dec_deg":0.20152,"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":"1864","featured":false,"url":"https://spacecatalog.org/object/ngc-5104","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.28,"h_mag":10.15,"j_mag":10.87,"k_mag":9.74,"redshift":0.01842,"hubble_type":"Sa","wikidata_id":"Q1117011","redshift_cmb":0.0194719791635396,"discovered_by":"Albert Marth","ngc_type_code":"G","uncertainties":{"distance_ly":[18023184.05094643,18023184.05094643]},"major_axis_arcmin":1.2,"minor_axis_arcmin":0.46,"position_angle_deg":170,"surface_brightness":23.11,"radial_velocity_km_s":5471},"designations":[{"catalog":"2MASX","designation":"2MASX J13212311+0020333"},{"catalog":"IRAS","designation":"IRAS 13188+0036"},{"catalog":"IRAS","designation":"IRAS F13188+0036"},{"catalog":"LEDA","designation":"LEDA 46633"},{"catalog":"MCG","designation":"MCG +00-34-031"},{"catalog":"NGC","designation":"NGC 5104"},{"catalog":"PGC","designation":"PGC 46633"},{"catalog":"SDSS","designation":"SDSS J132123.08+002032.6"},{"catalog":"SDSS","designation":"SDSS J132123.08+002032.7"},{"catalog":"SDSS","designation":"SDSS J132123.09+002032.6"},{"catalog":"SDSS","designation":"SDSS J132123.09+002032.7"},{"catalog":"UGC","designation":"UGC 8391"}],"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."}