{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T11:50:51.354Z","years_from_j2000":26.672,"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-6103","name":"NGC 6103","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":14.44,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":453800794.47741663,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":243.93591666666669,"dec_deg":31.963944444444444,"epoch_ra_deg":244.196814,"epoch_dec_deg":31.896503,"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":"Corona Borealis","discovered":"1791","featured":false,"url":"https://spacecatalog.org/object/ngc-6103","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.44,"h_mag":11.35,"j_mag":11.98,"k_mag":11.02,"redshift":0.03155,"hubble_type":"Sc","wikidata_id":"Q1986249","redshift_cmb":0.03172791825654908,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[23218011.248390455,23218011.248390455]},"major_axis_arcmin":0.72,"minor_axis_arcmin":0.45,"position_angle_deg":77,"surface_brightness":22.11,"radial_velocity_km_s":9309},"designations":[{"catalog":"2MASX","designation":"2MASX J16154462+3157507"},{"catalog":"IRAS","designation":"IRAS 16138+3205"},{"catalog":"IRAS","designation":"IRAS F16137+3205"},{"catalog":"LEDA","designation":"LEDA 57648"},{"catalog":"MCG","designation":"MCG +05-38-049"},{"catalog":"NGC","designation":"NGC 6103"},{"catalog":"PGC","designation":"PGC 57648"},{"catalog":"SDSS","designation":"SDSS J161544.61+315750.2"},{"catalog":"SDSS","designation":"SDSS J161544.62+315750.2"},{"catalog":"UGC","designation":"UGC 10302"}],"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."}