{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T08:17:18.782Z","years_from_j2000":26.669,"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-740680","name":"PGC 740680","class":"spiral_galaxy_s","category":"galaxy","object_type":"Spiral galaxy S","mag":15.074,"mag_band":"B","abs_mag":-19.932324489528888,"abs_mag_band":"B","distance_ly":327107704.31607896,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":209.817841,"dec_deg":-28.52206,"epoch_ra_deg":210.201496,"epoch_dec_deg":-28.652647,"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":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-740680","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.074,"h_mag":13.239,"j_mag":13.889,"k_mag":12.792,"redshift":0.02276,"hubble_type":"S","redshift_cmb":0.023016543014777,"uncertainties":{"distance_ly":[18356208.902406327,18360914.77836237],"stellar_mass_solar":[934125001.1228783,934125001.1228783]},"major_axis_arcmin":0.35,"minor_axis_arcmin":0.217,"morphology_source":"SIMBAD (quality D)","position_angle_deg":90,"stellar_mass_solar":2802375003.368635},"designations":[{"catalog":"2MASX","designation":"2MASX 13591628-2831194"},{"catalog":"PGC","designation":"PGC 740680"},{"catalog":"WISExSCOS","designation":"WISExSCOS J135916.23-283119.9"}],"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":"2026-09-01T22:58:55.274Z","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."}