{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T09:23:42.264Z","years_from_j2000":26.683,"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-6851b","name":"NGC 6851B","class":"barred_spiral_galaxy_sbcd","category":"galaxy","object_type":"Barred spiral galaxy SBcd","mag":14.81,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":155302034.42860088,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":301.4164166666667,"dec_deg":-47.979055555555554,"epoch_ra_deg":301.903112,"epoch_dec_deg":-47.902504,"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":"Telescopium","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ngc-6851b","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.77,"h_mag":12.56,"j_mag":13.27,"k_mag":12.29,"v_mag":14.81,"redshift":0.011484,"hubble_type":"SBcd","wikidata_id":"Q1148067","redshift_cmb":0.011025610470055236,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15421457.687517038,15421457.687517038]},"major_axis_arcmin":1.12,"minor_axis_arcmin":0.18,"position_angle_deg":67,"surface_brightness":24.08,"radial_velocity_km_s":3423},"designations":[{"catalog":"2MASX","designation":"2MASX J20053994-4758446"},{"catalog":"ESO","designation":"ESO 233-023"},{"catalog":"ESO","designation":"ESO 233-25"},{"catalog":"ESO-LV","designation":"ESO-LV 233-0230"},{"catalog":"LEDA","designation":"LEDA 64086"},{"catalog":"NGC","designation":"NGC 6851B"}],"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."}