{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T05:23:56.676Z","years_from_j2000":26.685,"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-242-020","name":"ESO 242-020","class":"spiral_galaxy","category":"galaxy","object_type":"Spiral galaxy","mag":13.75,"mag_band":"B","abs_mag":-19.70310924665575,"abs_mag_band":"B","distance_ly":159973381.3408307,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":9.510149,"dec_deg":-46.517563,"epoch_ra_deg":9.830401,"epoch_dec_deg":-46.369708,"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":"Phoenix","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/eso-242-020","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.75,"h_mag":14.719,"j_mag":15.266,"k_mag":14.414,"redshift":0.0105995452998,"hubble_type":"8.0","redshift_cmb":0.0113544472670869,"uncertainties":{"distance_ly":[30937950.433781575,31029971.6490461],"stellar_mass_solar":[93419352.00688662,93419352.00688662]},"major_axis_arcmin":1.52668,"minor_axis_arcmin":0.82792,"morphology_source":"SIMBAD (1989ESOLV.C......0L, quality D)","position_angle_deg":143,"stellar_mass_solar":186838704.01377323},"designations":[{"catalog":"2MASX","designation":"2MASX 00380243-4631032"},{"catalog":"PGC","designation":"PGC 2274"}],"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."}