{"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":"2026-08-31T22:50:11.501Z","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":"m105","name":"M105","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":9.27,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":57189772.21045877,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":161.956625,"dec_deg":12.58161111111111,"epoch_ra_deg":162.311263,"epoch_dec_deg":12.440073,"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":"Leo","discovered":"1781","featured":false,"url":"https://spacecatalog.org/object/m105","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.23,"h_mag":6.49,"j_mag":7.17,"k_mag":6.27,"v_mag":9.27,"redshift":0.002922,"hubble_type":"E","wikidata_id":"Q14377","redshift_cmb":0.004081507157087438,"discovered_by":"Pierre Méchain","ngc_type_code":"G","uncertainties":{"distance_ly":[14209647.15471267,14209647.15471267]},"major_axis_arcmin":4.89,"minor_axis_arcmin":4.25,"wikipedia_article":"Messier 105","position_angle_deg":71,"surface_brightness":22.54,"radial_velocity_km_s":875},"designations":[{"catalog":"2MASX","designation":"2MASX J10474959+1234538"},{"catalog":"LEDA","designation":"LEDA 32256"},{"catalog":"MCG","designation":"MCG +02-28-011"},{"catalog":"Messier","designation":"M 105"},{"catalog":"NGC","designation":"NGC 3379"},{"catalog":"PGC","designation":"PGC 32256"},{"catalog":"UGC","designation":"UGC 5902"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"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."}