{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-09-01T01:28:07.507Z","years_from_j2000":26.665,"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-140656","name":"PGC 140656","class":"spiral_galaxy","category":"galaxy","object_type":"Spiral galaxy","mag":15.029,"mag_band":"B","abs_mag":-19.79494015734399,"abs_mag_band":"B","distance_ly":300755727.511073,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":253.326294,"dec_deg":-4.46139,"epoch_ra_deg":253.681455,"epoch_dec_deg":-4.506053,"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":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-140656","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.029,"h_mag":11.429,"j_mag":12.281,"k_mag":11.049,"redshift":0.02278,"hubble_type":"5","redshift_cmb":0.0211908770939657,"uncertainties":{"distance_ly":[16697613.713861968,16702797.589137495],"stellar_mass_solar":[7473085842.058247,7473085842.058247]},"major_axis_arcmin":0.653,"minor_axis_arcmin":0.261,"morphology_source":"SIMBAD (2014MNRAS.443.1044M, quality D)","position_angle_deg":35,"stellar_mass_solar":14946171684.116493},"designations":[{"catalog":"2MASX","designation":"2MASX 16531831-0427410"},{"catalog":"PGC","designation":"PGC 140656"},{"catalog":"WISExSCOS","designation":"WISExSCOS J165318.31-042739.9"}],"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":"2026-08-30T09:56:50.739Z","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."}