{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T08:28:06.506Z","years_from_j2000":26.685,"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-2150","name":"NGC 2150","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":13.03,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":215380825.7020059,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":88.94308333333335,"dec_deg":-69.56080555555555,"epoch_ra_deg":88.88621,"epoch_dec_deg":-69.555661,"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":"Dorado","discovered":"1836","featured":false,"url":"https://spacecatalog.org/object/ngc-2150","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.62,"h_mag":10.05,"j_mag":10.75,"k_mag":9.74,"v_mag":13.03,"redshift":0.015018,"hubble_type":"Sab","wikidata_id":"Q1047170","redshift_cmb":0.015242683174101268,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16589845.05278356,16589845.05278356]},"major_axis_arcmin":1.15,"minor_axis_arcmin":0.61,"position_angle_deg":130,"surface_brightness":22.3,"radial_velocity_km_s":4468},"designations":[{"catalog":"2MASX","designation":"2MASX J05554635-6933392"},{"catalog":"ESO","designation":"ESO 057-055"},{"catalog":"ESO","designation":"ESO 57-55"},{"catalog":"ESO-LV","designation":"ESO-LV 57-0550"},{"catalog":"IRAS","designation":"IRAS 05562-6933"},{"catalog":"IRAS","designation":"IRAS F05562-6933"},{"catalog":"LEDA","designation":"LEDA 18097"},{"catalog":"NGC","designation":"NGC 2150"},{"catalog":"PGC","designation":"PGC 18097"}],"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."}