{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T06:02:55.025Z","years_from_j2000":26.663,"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-9554","name":"PGC 9554","class":"intermediate_spiral_galaxy_sab","category":"galaxy","object_type":"Intermediate spiral galaxy SAB:","mag":15.23,"mag_band":"B","abs_mag":-19.18749651591379,"abs_mag_band":"B","distance_ly":249416498.74002346,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":37.6642,"dec_deg":27.15863,"epoch_ra_deg":38.054398,"epoch_dec_deg":27.278054,"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":"Aries","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-9554","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.23,"h_mag":12,"j_mag":12.745,"k_mag":11.618,"redshift":0.0165711082856,"hubble_type":"SAB:","redshift_cmb":0.0176201804993495,"uncertainties":{"distance_ly":[49085792.20529957,49307726.68292266],"stellar_mass_solar":[4670783540.603622,4670783540.603622]},"major_axis_arcmin":1.05522,"minor_axis_arcmin":0.250192,"morphology_source":"SIMBAD (2019MNRAS.488.2175B, quality C)","position_angle_deg":73,"stellar_mass_solar":7473253664.9657955},"designations":[{"catalog":"2MASX","designation":"2MASX 02303951+2709321"},{"catalog":"Other","designation":"9554"},{"catalog":"PGC","designation":"PGC 1799472"}],"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."}