{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:48:18.833Z","years_from_j2000":26.687,"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-1811","name":"NGC 1811","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":14.48,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":180456296.26946592,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":77.17808333333335,"dec_deg":-29.275972222222222,"epoch_ra_deg":77.44091,"epoch_dec_deg":-29.240846,"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":"Columba","discovered":"1834","featured":false,"url":"https://spacecatalog.org/object/ngc-1811","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.48,"h_mag":10.48,"j_mag":11.19,"k_mag":10.17,"redshift":0.012735,"hubble_type":"Sa","wikidata_id":"Q1045439","redshift_cmb":0.01279444288477194,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15876276.406592429,15876276.406592429]},"major_axis_arcmin":1.73,"minor_axis_arcmin":0.42,"position_angle_deg":60,"surface_brightness":23.75,"radial_velocity_km_s":3794},"designations":[{"catalog":"2MASX","designation":"2MASX J05084275-2916336"},{"catalog":"ESO","designation":"ESO 422-037"},{"catalog":"ESO","designation":"ESO 422-37"},{"catalog":"ESO-LV","designation":"ESO-LV 422-0370"},{"catalog":"LEDA","designation":"LEDA 16811"},{"catalog":"MCG","designation":"MCG -05-13-008"},{"catalog":"NGC","designation":"NGC 1811"},{"catalog":"PGC","designation":"PGC 16811"}],"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."}