{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T17:56:49.020Z","years_from_j2000":26.684,"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-2838","name":"NGC 2838","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":14.45,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":406737865.05640316,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":140.17933333333335,"dec_deg":39.315749999999994,"epoch_ra_deg":140.602992,"epoch_dec_deg":39.201977,"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":"Lynx","discovered":"1787","featured":false,"url":"https://spacecatalog.org/object/ngc-2838","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.45,"h_mag":10.3,"j_mag":11.04,"k_mag":10.04,"redshift":0.02774,"hubble_type":"E","wikidata_id":"Q763455","redshift_cmb":0.02850446176552235,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[21734444.57108432,21734444.57108432]},"major_axis_arcmin":1.28,"minor_axis_arcmin":1.08,"position_angle_deg":123,"surface_brightness":23.78,"radial_velocity_km_s":8201},"designations":[{"catalog":"2MASX","designation":"2MASX J09204305+3918568"},{"catalog":"LEDA","designation":"LEDA 26434"},{"catalog":"MCG","designation":"MCG +07-19-061"},{"catalog":"NGC","designation":"NGC 2838"},{"catalog":"PGC","designation":"PGC 26434"},{"catalog":"SDSS","designation":"SDSS J092043.02+391856.6"},{"catalog":"SDSS","designation":"SDSS J092043.03+391856.6"},{"catalog":"SDSS","designation":"SDSS J092043.03+391856.7"},{"catalog":"SDSS","designation":"SDSS J092043.04+391856.7"}],"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."}