{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T09:54:25.779Z","years_from_j2000":26.675,"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-7713","name":"NGC 7713","class":"spiral_galaxy_scd","category":"galaxy","object_type":"Spiral galaxy Scd","mag":11.18,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":354.0624583333334,"dec_deg":-37.93808333333333,"epoch_ra_deg":354.419987,"epoch_dec_deg":-37.789558,"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":"Sculptor","discovered":"1836","featured":false,"url":"https://spacecatalog.org/object/ngc-7713","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.49,"h_mag":9.22,"j_mag":9.99,"k_mag":9.2,"v_mag":11.18,"redshift":0.002322,"hubble_type":"Scd","wikidata_id":"Q1168868","redshift_cmb":0.0014514214105718626,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","major_axis_arcmin":4.91,"minor_axis_arcmin":2.13,"wikipedia_article":"NGC 7713","position_angle_deg":170,"surface_brightness":22.97,"radial_velocity_km_s":695},"designations":[{"catalog":"2MASX","designation":"2MASX J23361515-3756221"},{"catalog":"ESO","designation":"ESO 347-028"},{"catalog":"ESO","designation":"ESO 347-28"},{"catalog":"ESO-LV","designation":"ESO-LV 347-0280"},{"catalog":"LEDA","designation":"LEDA 71866"},{"catalog":"MCG","designation":"MCG -06-51-013"},{"catalog":"NGC","designation":"NGC 7713"},{"catalog":"PGC","designation":"PGC 71866"}],"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."}