{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T07:29:24.148Z","years_from_j2000":26.674,"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-4089","name":"NGC 4089","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":14.64,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":358980913.01653886,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":181.40595833333333,"dec_deg":20.555722222222222,"epoch_ra_deg":181.749365,"epoch_dec_deg":20.406209,"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":"Coma Berenices","discovered":"1864","featured":false,"url":"https://spacecatalog.org/object/ngc-4089","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.64,"h_mag":10.67,"j_mag":11.38,"k_mag":10.4,"redshift":0.02413,"hubble_type":"E","wikidata_id":"Q1108903","redshift_cmb":0.025218335543937043,"discovered_by":"Heinrich Louis d'Arrest","ngc_type_code":"G","uncertainties":{"distance_ly":[20299193.32851579,20299193.32851579]},"major_axis_arcmin":0.86,"minor_axis_arcmin":0.84,"wikipedia_article":"NGC 4089","position_angle_deg":75,"surface_brightness":23.16,"radial_velocity_km_s":7147},"designations":[{"catalog":"2MASX","designation":"2MASX J12053741+2033207"},{"catalog":"LEDA","designation":"LEDA 38298"},{"catalog":"MCG","designation":"MCG +04-29-017"},{"catalog":"NGC","designation":"NGC 4089"},{"catalog":"PGC","designation":"PGC 38298"},{"catalog":"SDSS","designation":"SDSS J120537.43+203320.5"},{"catalog":"SDSS","designation":"SDSS J120537.43+203320.6"}],"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."}