{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T16:10:00.395Z","years_from_j2000":26.678,"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-3641729","name":"PGC 3641729","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":15.7,"mag_band":"B","abs_mag":-18.380120236503377,"abs_mag_band":"B","distance_ly":213525586.04465055,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":39.8985,"dec_deg":-10.82498,"epoch_ra_deg":40.224693,"epoch_dec_deg":-10.709057,"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":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-3641729","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.7,"h_mag":11.623,"j_mag":12.314,"k_mag":11.413,"redshift":0.0148845974423,"redshift_cmb":0.0151128507001567,"uncertainties":{"distance_ly":[43733703.92974326,43914105.09088833],"stellar_mass_solar":[5605028590.000267,5605028590.000267]},"stellar_mass_solar":14946742906.66738},"designations":[{"catalog":"2MASX","designation":"2MASX 02393565-1049302"},{"catalog":"Other","designation":"2MASXJ02393565-1049302"},{"catalog":"PGC","designation":"PGC 3641729"},{"catalog":"WISExSCOS","designation":"WISExSCOS J023935.64-104930.1"}],"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":"2026-09-02T19:50:56.720Z","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."}