{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T22:55:07.463Z","years_from_j2000":26.682,"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-2305","name":"NGC 2305","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":11.7,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":164761896.3012339,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":102.15570833333334,"dec_deg":-64.27319444444444,"epoch_ra_deg":102.195308,"epoch_dec_deg":-64.302495,"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":"Volans","discovered":"1834","featured":false,"url":"https://spacecatalog.org/object/ngc-2305","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.74,"h_mag":8.67,"j_mag":9.35,"k_mag":8.45,"v_mag":11.7,"redshift":0.011335,"hubble_type":"E","wikidata_id":"Q1048086","redshift_cmb":0.01169136575734342,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15586337.01187105,15586337.01187105]},"major_axis_arcmin":1.94,"minor_axis_arcmin":1.04,"wikipedia_article":"NGC 2305","position_angle_deg":137,"surface_brightness":23.02,"radial_velocity_km_s":3379},"designations":[{"catalog":"2MASX","designation":"2MASX J06483729-6416240"},{"catalog":"ESO","designation":"ESO 087-044"},{"catalog":"ESO","designation":"ESO 87-44"},{"catalog":"ESO-LV","designation":"ESO-LV 870-0440"},{"catalog":"ESO-LV","designation":"ESO-LV 87-0440"},{"catalog":"LEDA","designation":"LEDA 19641"},{"catalog":"NGC","designation":"NGC 2305"},{"catalog":"PGC","designation":"PGC 19641"}],"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."}