{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T07:38:12.452Z","years_from_j2000":26.666,"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-90801","name":"PGC 90801","class":"spiral_galaxy_scd","category":"galaxy","object_type":"Spiral galaxy Scd","mag":16.14,"mag_band":"B","abs_mag":-17.53489227531479,"abs_mag_band":"B","distance_ly":177175770.57315472,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":118.439,"dec_deg":39.78261,"epoch_ra_deg":118.892965,"epoch_dec_deg":39.712947,"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":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-90801","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.14,"redshift":0.0128664964332,"hubble_type":"Scd","redshift_cmb":0.0125640205937489,"uncertainties":{"distance_ly":[37369317.094121866,37505595.21524733],"stellar_mass_solar":[93418643.36084476,93418643.36084476]},"major_axis_arcmin":0.97785,"minor_axis_arcmin":0.15939,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":90,"stellar_mass_solar":186837286.72168952},"designations":[{"catalog":"PGC","designation":"PGC 90801"},{"catalog":"WISExSCOS","designation":"WISExSCOS J075345.34+394657.8"}],"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."}