Cygnus
Cygnus was a constellation which contained the Deneb system. 

While on a date, on a holographic re-creation of Mars, with Danara Pel, The Doctor pointed out the constellation Cygnus as among the many star formations and astronomical highlights seen from Mars. ()

Related locations 
 61 Cygni
 Alpha Cygnus IX
 Beta Cygni system
 Cygnus Sector
 Deneb
 Kepler-22b
 Omega Cygni
 Theta Cygni XII
 Veil Nebula

Also see 
 Alpha Cygni
 Cygnia Minor
 A Survey on Cygnian Respiratory Diseases

External link 
 

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Constellations