{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T10:11:35.351Z","years_from_j2000":26.672,"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":"ngc-4149","name":"NGC 4149","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":13.92,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":150685760.71884003,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":182.63683333333333,"dec_deg":58.304138888888886,"epoch_ra_deg":182.972772,"epoch_dec_deg":58.154717,"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":"Ursa Major","discovered":"1789","featured":false,"url":"https://spacecatalog.org/object/ngc-4149","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.92,"h_mag":10.13,"j_mag":10.99,"k_mag":9.8,"redshift":0.0102,"hubble_type":"SABb","wikidata_id":"Q4026077","redshift_cmb":0.010700492845260312,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15343790.182288663,15343790.182288663]},"major_axis_arcmin":1.37,"minor_axis_arcmin":0.27,"position_angle_deg":86,"surface_brightness":22.24,"radial_velocity_km_s":3042},"designations":[{"catalog":"2MASX","designation":"2MASX J12103285+5818137"},{"catalog":"IRAS","designation":"IRAS 12080+5834"},{"catalog":"IRAS","designation":"IRAS F12080+5835"},{"catalog":"LEDA","designation":"LEDA 38741"},{"catalog":"MCG","designation":"MCG +10-17-155"},{"catalog":"NGC","designation":"NGC 4149"},{"catalog":"NGC","designation":"NGC 4154"},{"catalog":"PGC","designation":"PGC 38741"},{"catalog":"SDSS","designation":"SDSS J121032.82+581815.1"},{"catalog":"SDSS","designation":"SDSS J121032.83+581814.9"},{"catalog":"SDSS","designation":"SDSS J121032.84+581814.8"},{"catalog":"UGC","designation":"UGC 7167"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"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."}