{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T22:28:55.375Z","years_from_j2000":26.668,"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":"pgc-15620","name":"PGC 15620","class":"barred_spiral_galaxy_sba","category":"galaxy","object_type":"Barred spiral galaxy SBa","mag":13.678,"mag_band":"B","abs_mag":-20.552869468123934,"abs_mag_band":"B","distance_ly":228875743.88024226,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":69.077637,"dec_deg":-2.831386,"epoch_ra_deg":69.414826,"epoch_dec_deg":-2.776261,"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":"Eridanus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-15620","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.678,"h_mag":10.103,"j_mag":10.72,"k_mag":9.827,"redshift":0.01567,"hubble_type":"SBa","redshift_cmb":0.0161863348483938,"uncertainties":{"distance_ly":[16357685.382623887,16359405.133414982],"stellar_mass_solar":[3736660521.586808,3736660521.586808]},"major_axis_arcmin":1.98604,"minor_axis_arcmin":1.13761,"morphology_source":"SIMBAD (2025A&A...696A.177S, quality D)","position_angle_deg":129,"stellar_mass_solar":30827449303.091167},"designations":[{"catalog":"2MASX","designation":"2MASX 04361863-0249529"},{"catalog":"PGC","designation":"PGC 15620"},{"catalog":"WISExSCOS","designation":"WISExSCOS J043618.63-024952.9"}],"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":"2026-08-30T09:56:50.739Z","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."}