{"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":"2026-09-04T04:09:11.219Z","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-12552","name":"PGC 12552","class":"barred_spiral_galaxy_sbc","category":"galaxy","object_type":"Barred spiral galaxy SBc","mag":13.756,"mag_band":"B","abs_mag":-20.524006951695846,"abs_mag_band":"B","distance_ly":234113935.471948,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":50.223999,"dec_deg":37.867092,"epoch_ra_deg":50.656723,"epoch_dec_deg":37.964075,"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":"Perseus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-12552","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.756,"h_mag":12.157,"j_mag":12.788,"k_mag":11.839,"redshift":0.01682,"hubble_type":"SBc","redshift_cmb":0.016552271899663,"uncertainties":{"distance_ly":[21118995.844263528,21120643.417639177],"stellar_mass_solar":[1868325973.2861483,1868325973.2861483]},"major_axis_arcmin":0.507,"minor_axis_arcmin":0.334,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":5,"stellar_mass_solar":3736651946.5722966},"designations":[{"catalog":"2MASX","designation":"2MASX 03205375+3752015"},{"catalog":"PGC","designation":"PGC 12552"},{"catalog":"WISExSCOS","designation":"WISExSCOS J032053.77+375201.5"}],"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."}