{"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":"2026-09-08T01:49:01.898Z","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":"pgc-1652518","name":"PGC 1652518","class":"irregular_galaxy_di","category":"galaxy","object_type":"Irregular galaxy dI","mag":17.56,"mag_band":"B","abs_mag":-15.660179733440192,"abs_mag_band":"B","distance_ly":143701672.20623237,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":252.009,"dec_deg":21.5582,"epoch_ra_deg":252.297371,"epoch_dec_deg":21.510158,"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-1652518","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":17.56,"redshift":0.00904449452225,"hubble_type":"dI","redshift_cmb":0.0102083147875512,"uncertainties":{"distance_ly":[26370227.44083389,26437288.279923208],"stellar_mass_solar":[46710012.52216507,46710012.52216507]},"major_axis_arcmin":0.32,"minor_axis_arcmin":0.23,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":41,"stellar_mass_solar":84078022.53989713},"designations":[{"catalog":"PGC","designation":"PGC 1652518"},{"catalog":"WISExSCOS","designation":"WISExSCOS J164802.19+213330.9"}],"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":"2026-09-02T19:50:56.720Z","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."}