{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:07:08.841Z","years_from_j2000":26.687,"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":"eso-572-021","name":"ESO 572-021","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":15.42,"mag_band":"B","abs_mag":-20.96109105817162,"abs_mag_band":"B","distance_ly":616089896.7229317,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":179.065979,"dec_deg":-20.908182,"epoch_ra_deg":179.408629,"epoch_dec_deg":-21.057738,"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":"Crater","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/eso-572-021","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.42,"h_mag":12.303,"j_mag":13.051,"k_mag":11.839,"redshift":0.04228,"redshift_cmb":0.0427334411094432,"uncertainties":{"distance_ly":[31270924.498766575,31288721.892847493],"stellar_mass_solar":[28020282374.49077,28020282374.49077]},"stellar_mass_solar":65380658873.81179},"designations":[{"catalog":"2MASX","designation":"2MASX 11561583-2054294"},{"catalog":"WISExSCOS","designation":"WISExSCOS J115615.83-205429.8"}],"source":{"id":"glade_plus","name":"GLADE+ (Galaxy List for the Advanced Detector Era)","url":"https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/291","license":"VizieR terms; cite Dalya+ 2022 (2022MNRAS.514.1403D)"},"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."}