Aquila, the Eagle, is surrounded by no fewer than nine other
constellations that touch its borders. Most prominent are Saggita that bounds most of its northern flank and Sagittarius its
southern. Aquarius is to its east and Serpens Cauda to the west. Aquila is at its most prominent to northern hemisphere observers during midsummer months when its brightest star, Altair forms the southernmost corner of the so called Summer Triangle with Deneb in Cygnus and Vega in Lyra. The Milky Way
is rich in this area of the sky and runs diagonally through Aquila. With good viewing conditions the starfields are a magnificent sight in binoculars or a small telescope on low magnification.

Mythology

Through the ages Aquila has been associated with an eagle in most cultures. In Greek mythology it was the eagle sent by Zeus to return his thunderbolts and to bring the youth Ganymede to Olympus to act as wine bearer for the gods. Aquila's southern stars formerly constituted a separate constellation 'Antinous', named by the Emperor Hadrian in the year 132 AD. Antinous was a favourite servant of the Emperor, who drowned himself in the mistaken belief that to do so would extend his masters life. Hadrian named the constellation for him but it has now fallen into disuse. Another association has been drawn linking Aquila, Cygnus and another defunct constellation, 'Vulcan Cadens', now known as Lyra, with the Stymphalian birds hunted by Hercules in his sixth labour.

Principle Stars

Alpha Aquilae, Altair, is named from the Arabic for the
constellation and translates to 'Flying Eagle' or 'The Flying One'. It is the twelfth brightest star in the sky at a magnitude of -0.77 and has a very rapid axial spin completing one revolution every 6.5 hours which causes it to deform into an oblate sphere and distort its spectral line signature. It is also relatively close at only 17 light-years distance.

Altair is straddled by Beta Aquilae Alshain and Gamma Aquilae
Tarazed which presents a line, spanning about five degrees from south-east to north-west portraying the upper body of the eagle. Alshain is 'The Falcon' and Tarazed 'The Plundering Falcon' from parts of the Persian name for the constellation. Together they are occasionally known as 'The Family of Aquila'. Two stars, Epsilon and Zeta Aquilae, mark the eagle's tail and both have the same name Deneb al Okab, whose meaning translates to that part of the bird's anatomy.

Clusters, Nebulae and Extra-Solar Planets

Within Aquila, approximately five degrees south-west of Zeta Aquilae lies a compact, open star cluster NGC 6709. It is some 2,500 lightyears distant and contains about 40 stars. Another cluster, NGC 6755 of approximately 100 stars at magnitude +7.5 lies near Delta Aqul. Both clusters are easy objects to find with small instruments.

Contrasting with the starfields of the Milky Way are the Dark Nebulae of B142 and B143. When viewing conditions are good they can be seen just over a degree west of Gamma Aquilae with binoculars or small telescopes, as dark patches obscuring the stars. B142 has the same angular displacement as that of a full moon and is shaped rather like the Greek letter Epsilon, hence its name the 'E Nebula'.

It was announced in April 2007 that the hunt for Extra-Solar Planets, had found one 2.5 times the mass of our own Jupiter, orbiting a star (HD 192699) in Aquila. The star is magnitude 6.4 and is at a distance of 220 light-years from Earth. The planet orbits its sun in 351.5 Earth days at a distance of approximately 0.78 AU¹.

Meteor Showers

Two meteor showers occur which have their radiants within Aquila. Evidence of both showers are from radar which show the existence of the June Aquilids occurring between 2 June and 2 July with an hourly rate between 13 and 35 and the Epsilon Aquilids, during mid May. Neither shower is prominent.

Novae

On 8 June, 1918, the brightest nova of the 20th Century occurred within Aquila which peaked at magnitude -1.4 near Delta Aquilae. It remained within naked eye sight for some five months afterwards. A second nova² was recorded on 10 December, 1999 which flared to magnitude 4 but had faded some ten days later.

In the Eagle’s Talons

Aquila the Eagle has been depicted through the ages with various objects clutched in its talons. It’s connections with Zeus have shown it clutching arrows, bows or thunderbolts. One of the later depictions and probably the most familiar, shows it holding the youth Ganymede as he is transported to Mount Olympus.

In July 1969 Apollo 11's Lunar Module, named ‘Eagle’ dropped out of orbit around the moon and landed on the Mare Tranquillitatis³. The mission badge for Apollo 11 shows an American Bald Eagle clutching an olive branch in its talons, flying in to a landing on the lunar surface. The badge had been designed by Mike Collins, the third crew-member and the mission’s Command Module Pilot. The design had originally shown the eagle carrying the olive branch in its beak and with its legs and claws extended ready for alighting. NASA management rejected the badge as appearing to be too hostile and warlike. Collins redrew the badge with the olive branch in its talons which was accepted. Collins commented ‘I hope it drops the olive branch before landing’.