{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T23:16:40.691Z","years_from_j2000":26.673,"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-5798","name":"NGC 5798","class":"irregular_galaxy_i","category":"galaxy","object_type":"Irregular galaxy I","mag":13.43,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":91083400.4997575,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":224.4082083333333,"dec_deg":29.9685,"epoch_ra_deg":224.692876,"epoch_dec_deg":29.860353,"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":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-5798","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.43,"h_mag":11.29,"j_mag":11.88,"k_mag":10.95,"redshift":0.005974,"hubble_type":"I","wikidata_id":"Q579217","redshift_cmb":0.006488578541844259,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14518555.163849156,14518555.163849156]},"major_axis_arcmin":1.24,"minor_axis_arcmin":0.83,"position_angle_deg":46,"surface_brightness":22.28,"radial_velocity_km_s":1786},"designations":[{"catalog":"2MASX","designation":"2MASX J14573796+2958065"},{"catalog":"IRAS","designation":"IRAS 14555+3009"},{"catalog":"IRAS","designation":"IRAS F14555+3009"},{"catalog":"LEDA","designation":"LEDA 53463"},{"catalog":"MCG","designation":"MCG +05-35-028"},{"catalog":"NGC","designation":"NGC 5798"},{"catalog":"PGC","designation":"PGC 53463"},{"catalog":"SDSS","designation":"SDSS J145737.96+295808.1"},{"catalog":"UGC","designation":"UGC 9628"}],"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."}