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Pegasus
 

Abbreviation: Peg
Genitive: Pegasi
Translation: The Winged Horse

Position in the Sky
Right Ascension: 22 hours
Declination: 20 degrees
Visible between latitudes 90 and -60 degrees
Best seen in October (at 9:00 PM)
Named Stars

MARKAB (Alpha Peg)
SCHEAT (Beta Peg)
ALGENIB (Gamma Peg)
ENIF (Epsilon Peg)
Homam (Zeta Peg)
Matar (Eta Peg)
Baham (Theta Peg)
Salm (Tau Peg)
Messier Objects

M15 (globular cluster)
The Story of Perseus

Take a look at the story of how Perseus slew Medusa, the mother of Pegasus, and rescued Andromeda, the daughter of Cepheus and Cassiopeia, from the sea monster Cetus.
Pegasus was later brought to Mount Helicon by Bellerophon and with one kick of his hoof, he caused the spring of Hippocrene to flow. Hippocrene is said to be the source of inspiration to poets. Bellerophon, who slayed the hideous beast Chimaera, became so headstrong that he ordered Pegasus to fly him up to Mount Olympus, the home of the gods. This impudence angered Zeus, who sent an insect to sting the winged horse, who bucked Bellerophon off its back. Needless to say, Bellerophon did not survive the fall to Earth. Pegasus went on to greatness, however, as the "Thundering Horse of Jove" who carried lightning bolts for Zeus.

Mensa
 

Abbreviation: Men
Genitive: Mensae
Translation: The Table Mountain

Position in the Sky
Right Ascension: 5 hours
Declination: -80 degrees
Visible between latitudes 0 and -90 degrees
Best seen in January (at 9:00 PM)
Mensa was named by Abbé Nicolas Louis de Lacaille. The original name, Mons Mensa, after the table mountain near de Lacaille's observatory in Cape Town, was officially shortened when the International Astronomical Union (IAU) accepted the 88 constellations that exist today.

Canes Venatici
 

Abbreviation: CVn
Genitive: Canum Venaticorum
Translation: The Hunting Dogs

Position in the Sky
Right Ascension: 13 hours
Declination: 40 degrees
Visible between latitudes 90 and -40 degrees
Best seen in May (at 9:00 PM)
Named Stars

COR CAROLI (Alpha 2 CVn)
Chara (Beta CVn)
Messier Objects

M3 (globular cluster)
M51 The Whirlpool Galaxy (spiral galaxy)
M63 The Sunflower Galaxy (spiral galaxy)
M94 (spiral galaxy)
M106 (spiral galaxy)
These are the Hunting Dogs (no relation to Orion's dogs, Canis Major and Canis Minor) held on a leash by Boötes as he hunts for the bears Ursa Major and Ursa Minor. This minor constellations was invented by Johannes Hevelius in 1687.

Sagitta
 

Abbreviation: Sge
Genitive: Sagittae
Translation: The Arrow

Position in the Sky
Right Ascension: 20 hours
Declination: 10 degrees
Visible between latitudes 90 and -70 degrees
Best seen in September (at 9:00 PM)
Named Stars

Sham (Alpha Sge)
Messier Objects

M71 (globular cluster)

Aquila
 

Abbreviation: Aql
Genitive: Aquilae
Translation: The Eagle

Position in the Sky
Right Ascension: 20 hours
Declination: 5 degrees
Visible between latitudes 85 and -75 degrees
Best seen in September (at 9:00 PM)
Named Stars

ALTAIR (Alpha Aql)
ALSHAIN (Beta Aql)
TARAZED (Gamma Aql)
Deneb el Okab (Epsilon Aql)
Deneb el Okab (Zeta Aql)
Altair, along with Deneb and Vega form the well-known Summer Triangle.
Depictied as an eagle, Aquila is named for the bird that belonged to Zeus. Aquila's most famous task was carrying the mortal Ganymede to the heavens to serve as Zeus' cup bearer.

Two major novae have been observed in Aquila. The first one was in 389 AD and was recorded to be as bright as Venus. The other shone brighter than Altair, the brightest star in Aquila. A nova is what the ancients called a "new star." In reality, it is not a new star at all, but a very old one that suddenly becomes bright again, regaining some of the former glory of its youth. Note that there is a very strong difference between a nova (an old star brightening temporarily) and a supernova (a massive star exploding).