Air Pump · pronounced Antlia. Antlia, meaning “Air Pump,” is an official IAU constellation centred near right ascension 10.4 hours and declination -36°. Its observing character is defined by the named stars and targets below. Nicolas-Louis de Lacaille introduced Antlia Pneumatica in the eighteenth century to honour the air pump used in experimental physics. The shortened modern name Antlia preserves that instrument theme rather than an ancient myth. The line figure is only a guide: the IAU boundary is the scientifically meaningful region, while historical and cultural interpretations require their own context.
About Antlia
Antlia is one of the 88 constellations recognized by the International Astronomical Union. Its standard three-letter abbreviation is Ant, and astronomers use the genitive form Antliae when naming stars associated with it. The constellation's reference position lies around right ascension 10.4 hours and declination -36 degrees.
Its location places it in the southern sky. For a typical mid-latitude observer, this part of the celestial sphere is especially well placed during winter evenings. Exact visibility depends on latitude, local horizon, date and time.
History and mythology of Antlia
Origins and cultural history
Nicolas-Louis de Lacaille introduced Antlia Pneumatica in the eighteenth century to honour the air pump used in experimental physics. The shortened modern name Antlia preserves that instrument theme rather than an ancient myth.
From figure to official region
The IAU retained Air Pump as one of 88 official constellations in 1922; Eugène Delporte’s boundaries later turned the traditional figure into an exact cataloguing region.
How to find Antlia
- Start from bright Alphard in Hydra or the stars of western Centaurus.
- Look south of Hydra and north of Vela; Antlia has no star brighter than magnitude 4.2.
- Use a wide-field chart to identify Alpha, Epsilon and Iota Antliae as a sparse bent pattern.
- Observe from southern latitudes in February–April; galaxy hunting needs a dark moonless sky.
Bright stars in Antlia
Alpha Antliae
Notable star- Magnitude
- 4.25
- Distance
- about 320 light-years
Orange giant and the constellation’s brightest star.
Epsilon Antliae
Notable star- Magnitude
- 4.51
- Distance
- about 700 light-years
Evolved orange giant in central Antlia.
Iota Antliae
Notable star- Magnitude
- 4.60
- Distance
- about 200 light-years
Orange giant visible from a dark site.
Deep-sky objects in Antlia
NGC 2997
Grand-design spiral, a rewarding southern imaging target.
Antlia Dwarf Galaxy
Faint Local Group member discovered on photographic survey plates.
Antlia Cluster (Abell S0636)
Nearby southern cluster dominated by giant ellipticals NGC 3258 and NGC 3268.
NGC 3244
Face-on barred spiral that hosted supernova SN 2010ev.
Interesting facts about Antlia
- Antlia’s traditional name refers to air pump, while its official IAU boundary defines a precise region of the sky.
- Alpha Antliae, at magnitude 4.25, is a key star in Antlia. Orange giant and the constellation’s brightest star.
- NGC 2997 is a notable spiral galaxy in Antlia. Grand-design spiral, a rewarding southern imaging target.
- Antlia Dwarf Galaxy, a dwarf spheroidal/irregular galaxy, is another observing target within the constellation.
- Nicolas-Louis de Lacaille introduced Antlia Pneumatica in the eighteenth century to honour the air pump used in experimental physics.