{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T03:58:54.196Z","years_from_j2000":26.666,"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-5855","name":"NGC 5855","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":15.34,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":526486772.27367073,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":226.95433333333335,"dec_deg":3.984166666666667,"epoch_ra_deg":227.29089,"epoch_dec_deg":3.880771,"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":"1887","featured":false,"url":"https://spacecatalog.org/object/ngc-5855","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.34,"h_mag":10.93,"j_mag":11.7,"k_mag":10.69,"redshift":0.036037,"hubble_type":"E","wikidata_id":"Q1123544","redshift_cmb":0.036677860787269534,"discovered_by":"Lewis A. Swift","ngc_type_code":"G","uncertainties":{"distance_ly":[25616251.933120176,25616251.933120176]},"major_axis_arcmin":0.83,"minor_axis_arcmin":0.61,"position_angle_deg":62,"surface_brightness":23.8,"radial_velocity_km_s":10609},"designations":[{"catalog":"2MASX","designation":"2MASX J15074903+0359028"},{"catalog":"LEDA","designation":"LEDA 54014"},{"catalog":"NGC","designation":"NGC 5855"},{"catalog":"PGC","designation":"PGC 54014"},{"catalog":"SDSS","designation":"SDSS J150749.04+035902.9"}],"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."}