History of the star: Deneb Okab "Tail of the Eagle" is a star southwest of the Eagle's right shoulder. Although this star was always part of Aquila, for a time it was also once part of the constellation of Antinous along with eta and sigma, theta, iota, kappa, lamda, upsilon, all now in Aquila. The constellation is said to have been introduced into the sky, in the year 132, by the Emperor Hadrian, in honor of his young Bithynian favorite, whose soul his courtiers had shown him shining in its lucida after the youth's self-sacrifice by drowning in the Nile from his belief that his master's life might thus be prolonged. This was because the oracle at Beza had asserted that only by the death of the object which the emperor most loved could great danger to the latter be averted. The new asterism, however, was little known among early astronomers; and although Ptolemy alluded to it, he did so but slightingly [doubtlessly because of catamite connotations].

This star delta (Deneb Okab), eta and theta, of 3rd to 4th magnitudes, in Antinous, were Al Mizan, the "Scale-beam", of early Arabia, from their similar direction and nearly equal distances apart. 

[Star Names, Their Lore and Meaning, Richard Hinchley Allen, 1889].  

The astrological influences of the constellation: It is said to give great imagination, strong passions, indomitable will, a dominating character, and influence over others, clairvoyance, a keen penetrating mind and ability for chemical research. It has always been associated with the sign Scorpio and by the Kabalists with the Hebrew letter Vau and the 6^th Tarot Trump, The "Lovers". (Fixed Stars and Constellations in Astrology, Vivian E. Robson, 1923)

The astrological influences of the constellation given by Manilius:

"The Eagle, soars to the heights, the bird of mighty Jupiter carrying thunderbolts, it is a bird worthy of Jupiter and the sky, which it furnishes with awful armaments. This bird brings back the thunderbolts which Jupiter has flung and fights in the service of heaven. He that is born on earth in the hour of its rising, will grow up bent on spoil and plunder, won even with bloodshed; he will draw no line between peace and war, between citizen and foe, and when he is short of men to kill he will engage in butchery of beast. He is a law unto himself, and rushes violently wherever his fancy takes him; in his eyes to show contempt for everything merits praise. Yet, should perchance his aggressiveness be enlisted in a righteous cause, depravity will turn into virtue, and he will succeed in bringing wars to a conclusion and enriching his country with glorious triumphs. And, since the Eagle does not wield, but supplies weapons, seeing that it brings back and restores to Jupiter the fires and bolts he has hurled, in time of war such a man will be the aide of a king or of some mighty general, and his strength will render them important service". [Astronomica, Manilius, 1st century AD, book 5, p.341.].