{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T18:52:52.818Z","years_from_j2000":26.684,"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-042-004","name":"ESO 042-004","class":"irregular_galaxy_i","category":"galaxy","object_type":"Irregular galaxy I...","mag":14.41,"mag_band":"B","abs_mag":-18.3117,"abs_mag_band":"B","distance_ly":114226499.650213,"distance_method":"luminosity distance as published (GLADE+)","ra_deg":228.603,"dec_deg":-77.26551,"epoch_ra_deg":229.442303,"epoch_dec_deg":-77.365343,"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":"Apus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/eso-042-004","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.41,"h_mag":13.455,"j_mag":14.081,"k_mag":13.23,"redshift":0.0078414039207,"hubble_type":"I...","redshift_cmb":0.0078569055084559,"uncertainties":{"distance_ly":[4377569.793237038,4377569.793237038],"stellar_mass_solar":[200000000,200000000]},"major_axis_arcmin":1.12,"minor_axis_arcmin":0.45,"morphology_source":"SIMBAD (quality D)","position_angle_deg":69,"stellar_mass_solar":300000000},"designations":[{"catalog":"2MASX","designation":"2MASX 15142554-7715561"},{"catalog":"PGC","designation":"PGC 54399"}],"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."}