Del

...Abbreviation: Del. A small constellation facing the Milky Way. In Greek mythology, dolphins were messengers of the sea god Poseidon, and it is said that they became a constellation because of their achievement in finding Amphitrite, the beloved wife of the sea god who had fled. Alpha star has an apparent magnitude of 3.9 and a spectral type of B8, while Beta star has a magnitude of 3.7 and a spectral type of F3. It is also known in Japanese as "Diamond Star" due to its shape of αβγδ. Its approximate position is 20h35m in right ascension and +12° in declination. It reaches its highest point in the sky at 8pm in late September. [Ishida Goro]...

*Some of the terminology explanations that mention "Del" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…略号Del。天の川に面した小星座。イルカはギリシア神話では海神ポセイドンの使いで，逃げ去った海神の愛妻アンフィトリテをさがし出した功績で星座になったという。α星は実視等級3.9等，スペクトル型はB8,β星は3.7等，スペクトル型はF3である。αβγδの形から〈ひし星〉の和名もある。概略位置は赤経20h35m，赤緯＋12゜。午後8時の南中は9月下旬である。【石田 五郎】…

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出典｜株式会社平凡社世界大百科事典 第２版について | 情報