{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T19:40:46.378Z","years_from_j2000":26.668,"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-42342","name":"PGC 42342","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy SA","mag":15.621,"mag_band":"B","abs_mag":-19.49280155695974,"abs_mag_band":"B","distance_ly":343705266.37291956,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":189.843521,"dec_deg":0.460274,"epoch_ra_deg":190.187352,"epoch_dec_deg":0.312685,"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":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-42342","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.621,"h_mag":12.244,"j_mag":12.888,"k_mag":11.963,"redshift":0.02359,"hubble_type":"SA","redshift_cmb":0.0241639656059241,"uncertainties":{"distance_ly":[17652429.531609904,17657879.908993334],"stellar_mass_solar":[3736473123.338126,3736473123.338126]},"major_axis_arcmin":0.826713,"minor_axis_arcmin":0.352345,"morphology_source":"SIMBAD (2019MNRAS.488..590B, quality C)","position_angle_deg":51,"stellar_mass_solar":8407064527.510784},"designations":[{"catalog":"2MASX","designation":"2MASX 12392244+0027369"},{"catalog":"PGC","designation":"PGC 42342"},{"catalog":"WISExSCOS","designation":"WISExSCOS J123922.45+002736.7"}],"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."}