| gptkbp:instanceOf | gptkb:astronomy 
 | 
                        
                            
                                | gptkbp:abbreviation | Hya 
 | 
                        
                            
                                | gptkbp:area | 1303 square degrees 
 | 
                        
                            
                                | gptkbp:bestViewedIn | April 
 | 
                        
                            
                                | gptkbp:borderedBy | gptkb:Antlia gptkb:Crater
 gptkb:cancer
 gptkb:Sextans
 gptkb:Canis_Minor
 gptkb:Virgo
 gptkb:Leo
 gptkb:Corvus
 gptkb:Centaurus
 gptkb:Norma
 gptkb:Pyxis
 gptkb:Lupus
 Libra
 
 | 
                        
                            
                                | gptkbp:brightestStar | gptkb:Alphard 
 | 
                        
                            
                                | gptkbp:contains | gptkb:Alphard Gamma Hydrae
 Zeta Hydrae
 
 | 
                        
                            
                                | gptkbp:containsMessierObject | gptkb:Messier_48 gptkb:Messier_68
 gptkb:Messier_83
 
 | 
                        
                            
                                | gptkbp:declination | −20° 
 | 
                        
                            
                                | gptkbp:family | Hercules family 
 | 
                        
                            
                                | gptkbp:genitive | Hydrae 
 | 
                        
                            
                                | gptkbp:IAUAdopted | 1922 
 | 
                        
                            
                                | gptkbp:IAUConstellationNumber | 41 
 | 
                        
                            
                                | gptkbp:locatedIn | southern celestial hemisphere 
 | 
                        
                            
                                | gptkbp:mainStar | 17 
 | 
                        
                            
                                | gptkbp:mythology | gptkb:Greek_mythology 
 | 
                        
                            
                                | gptkbp:namedAfter | gptkb:Lernaean_Hydra 
 | 
                        
                            
                                | gptkbp:notableDeepSkyObject | gptkb:NGC_3109 gptkb:NGC_3621
 gptkb:NGC_3242
 gptkb:NGC_3314
 ESO 501-23
 
 | 
                        
                            
                                | gptkbp:numberOfMessierObjects | 3 
 | 
                        
                            
                                | gptkbp:quadrant | gptkb:SQ2 
 | 
                        
                            
                                | gptkbp:rank | 1 
 | 
                        
                            
                                | gptkbp:rating | 18 
 | 
                        
                            
                                | gptkbp:rightAscension | 13h 
 | 
                        
                            
                                | gptkbp:symbolizes | water snake 
 | 
                        
                            
                                | gptkbp:visibleBetweenLatitudes | +54° and −83° 
 | 
                        
                            
                                | gptkbp:zodiacSign | no 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Centaurus_constellation 
 | 
                        
                            
                                | gptkbp:bfsLayer | 7 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Hydra constellation 
 |