{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T07:40:21.439Z","years_from_j2000":26.674,"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-3834717","name":"PGC 3834717","class":"spiral_galaxy","category":"galaxy","object_type":"Spiral galaxy","mag":16.6,"mag_band":"B","abs_mag":-17.99329201867632,"abs_mag_band":"B","distance_ly":270448314.36741644,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":222.538,"dec_deg":47.31699,"epoch_ra_deg":222.774277,"epoch_dec_deg":47.205485,"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":"Boötes","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-3834717","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.6,"h_mag":14.399,"j_mag":14.989,"k_mag":13.906,"redshift":0.0186062193031,"hubble_type":"4.36","redshift_cmb":0.0190852045158277,"uncertainties":{"distance_ly":[54498529.75099779,54781524.602461085],"stellar_mass_solar":[840733282.3759423,840733282.3759423]},"major_axis_arcmin":0.31809,"minor_axis_arcmin":0.248174,"morphology_source":"SIMBAD (2022MNRAS.513..389R, quality C)","position_angle_deg":22,"stellar_mass_solar":1307807328.1403549},"designations":[{"catalog":"2MASX","designation":"2MASX 14500924+4719010"},{"catalog":"Other","designation":"2MASXJ14500924+4719010"},{"catalog":"PGC","designation":"PGC 3834717"},{"catalog":"WISExSCOS","designation":"WISExSCOS J145009.21+471900.7"}],"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."}