{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T17:53:55.520Z","years_from_j2000":26.681,"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-173-002","name":"ESO 173-002","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":15.45,"mag_band":"B","abs_mag":-19.273086932527097,"abs_mag_band":"B","distance_ly":287106656.5569943,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.595428,"dec_deg":-56.292744,"epoch_ra_deg":195.997528,"epoch_dec_deg":-56.437284,"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":"Centaurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/eso-173-002","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.45,"h_mag":11.288,"j_mag":12.042,"k_mag":10.962,"redshift":0.0185967692984,"hubble_type":"Sc","redshift_cmb":0.0202433735901797,"uncertainties":{"distance_ly":[14956019.721618406,14959167.718817426],"stellar_mass_solar":[7473130355.492477,7473130355.492477]},"major_axis_arcmin":0.63,"minor_axis_arcmin":0.302,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":175,"stellar_mass_solar":16814543299.858074},"designations":[{"catalog":"2MASX","designation":"2MASX 13022290-5617338"},{"catalog":"PGC","designation":"PGC 44999"},{"catalog":"WISExSCOS","designation":"WISExSCOS J130222.77-561733.5"}],"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."}