{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T10:15:32.545Z","years_from_j2000":26.675,"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-7559b","name":"NGC 7559B","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":14.43,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":197430971.12984645,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":348.944,"dec_deg":13.290277777777778,"epoch_ra_deg":349.280852,"epoch_dec_deg":13.436664,"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":"Pegasus","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-7559b","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.43,"h_mag":10.17,"j_mag":10.88,"k_mag":9.95,"redshift":0.01523,"hubble_type":"E-S0","wikidata_id":"Q1168036","redshift_cmb":0.013985484693942452,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16211784.251868472,16211784.251868472]},"major_axis_arcmin":1.29,"minor_axis_arcmin":1.17,"position_angle_deg":66,"surface_brightness":23.5,"radial_velocity_km_s":4531},"designations":[{"catalog":"2MASX","designation":"2MASX J23154653+1317253"},{"catalog":"LEDA","designation":"LEDA 70852"},{"catalog":"MCG","designation":"MCG +02-59-013"},{"catalog":"NGC","designation":"NGC 7559-2"},{"catalog":"NGC","designation":"NGC 7559B"},{"catalog":"SDSS","designation":"SDSS J231546.55+131725.0"},{"catalog":"SDSS","designation":"SDSS J231546.56+131725.0"},{"catalog":"UGC","designation":"UGC 12463 NOTES01"}],"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."}