{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T14:09:25.918Z","years_from_j2000":26.675,"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-4007524","name":"PGC 4007524","class":"spiral_galaxy_sm_im","category":"galaxy","object_type":"Spiral galaxy Sm/Im","mag":16.84,"mag_band":"B","abs_mag":-15.15782757349282,"abs_mag_band":"B","distance_ly":81844856.18460986,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":256.322,"dec_deg":35.87288,"epoch_ra_deg":256.561454,"epoch_dec_deg":35.835603,"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":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-4007524","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.84,"redshift":0.00394716197358,"hubble_type":"Sm/Im","redshift_cmb":0.005833336034324,"uncertainties":{"distance_ly":[11761452.431886792,11773938.482558737],"stellar_mass_solar":[18684520.499568384,18684520.499568384]},"major_axis_arcmin":0.525167,"minor_axis_arcmin":0.19699,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":134,"stellar_mass_solar":28026780.749352578},"designations":[{"catalog":"PGC","designation":"PGC 4007524"},{"catalog":"SDSSJ","designation":"SDSSJ 170517.35+355222"},{"catalog":"WISExSCOS","designation":"WISExSCOS J170517.42+355222.3"}],"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."}