{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:42:15.453Z","years_from_j2000":26.654,"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":"m90","name":"M90","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":9.54,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":189.20745833333334,"dec_deg":13.162944444444445,"epoch_ra_deg":189.546271,"epoch_dec_deg":13.015121,"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":"1781","featured":false,"url":"https://spacecatalog.org/object/m90","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.18,"h_mag":6.79,"j_mag":7.5,"k_mag":6.58,"v_mag":9.54,"redshift":-0.000784,"hubble_type":"Sab","wikidata_id":"Q14343","redshift_cmb":0.00029236760847917154,"discovered_by":"Charles Messier","ngc_type_code":"G","major_axis_arcmin":9.12,"minor_axis_arcmin":3.82,"wikipedia_article":"Messier 90","position_angle_deg":22,"surface_brightness":23.16,"radial_velocity_km_s":-235},"designations":[{"catalog":"2MASX","designation":"2MASX J12364981+1309463"},{"catalog":"IRAS","designation":"IRAS 12343+1326"},{"catalog":"IRAS","designation":"IRAS F12343+1326"},{"catalog":"LEDA","designation":"LEDA 42089"},{"catalog":"MCG","designation":"MCG +02-32-155"},{"catalog":"Messier","designation":"M 90"},{"catalog":"NGC","designation":"NGC 4569"},{"catalog":"PGC","designation":"PGC 42089"},{"catalog":"SDSS","designation":"SDSS J123649.79+130946.5"},{"catalog":"UGC","designation":"UGC 7786"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}