Given the task definition and input, reply with output. In this task, you will be given a passage to read. A fill in the blank question will be given to you. Your answer should fit the blank appropriately.

WASP @-@ 44 was observed between July and November 2009 by the WASP @-@ South , a station of the SuperWASP planet @-@ searching program based at the South African Astronomical Observatory . Observations of the star revealed a periodic decrease in its brightness . WASP @-@ South , along with the SuperWASP @-@ North station at the Roque de los Muchachos Observatory on the Canary Islands , collected 15 @,@ 755 photometric observations , allowing scientists to produce a more accurate light curve . Another set of observations yielded a 6 @,@ 000 point photometric data set , but the light curve was prepared late and was not considered in the discovery paper . In 2010 , a European science team investigated the star using the CORALIE spectrograph and collected seventeen spectra of WASP @-@ 44 . From the spectra , radial velocity measurements were extrapolated . Analysis of collected CORALIE data ruled out the possibility that the detected radial velocity was caused by the blended spectrum of a spectroscopic binary star , supporting the possibility that the body orbiting WASP @-@ 44 was indeed a planet , designated WASP @-@ 44b . The Leonhard Euler Telescope at La Silla Observatory in Chile was used to follow up on the discovery circling WASP @-@ 44 , searching for a point at which the planet transited , or crossed in front of , its host star . One transit was detected . WASP @-@ 44 , its recently discovered planet , the planets orbiting WASP @-@ 45 and WASP @-@ 46 , and a discussion exploring the validity of the common assumption amongst scientists that closely orbiting Hot Jupiter planets have highly circular orbits unless proven otherwise , were reported in a single discovery paper that was published on May 17 , 2011 by the Royal Astronomical Society . The paper was submitted to the Monthly Notices of the Royal Astronomical Society on May 16 , 2011 . fill in the blank : WASP @-@ 44 was observed between July and November 2009 by the WASP @-@ South , a station of the SuperWASP planet @-@ searching __________________ based at the South African Astronomical Observatory .
program