The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union, is "Ant".[9] The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930,[lower-alpha 3] are defined by a polygon with an east side, south side and ten other sides (facing the two other cardinal compass points) (illustrated in infobox at top-right). In the equatorial coordinate system, the right ascension coordinates of these borders lie between 09h 26.5m and 11h 05.6m , while the declination coordinates are between −24.54° and −40.42°.[2]