Air pump (constellation)
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Constellation Air Pump |
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| Latin name | Antlia |
| Latin genitive | Antliae |
| Abbreviation | Ant |
| Right ascension | 09 h 26 m 56 s to 11 h 05 m 55 s |
| declination | −40 ° 25 ′ 29 ″ to −24 ° 32 ′ 33 ″ |
| surface | 238.901 deg² rank 62 |
| Completely visible | 49.4 ° N to 90 ° S |
| Observation time for Central Europe | spring |
| Number of stars brighter than 3 mag | 0 |
| Brightest star (size) | Antliae (4.25) |
| Meteor streams | |
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Neighboring constellations ( clockwise from north ) |
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| swell | IAU , |
 The constellation Antlia as seen with the naked eye |
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The air pump ( Latin / technical language Antlia ) is a constellation south of the celestial equator .
description
The air pump is a very inconspicuous constellation made up of faint stars . Only the brightest star, α Antliae, reaches the 4th magnitude .
The constellation is difficult to observe from Germany because it is only a few degrees above the horizon in spring.
history
In the 18th century, the French astronomer Nicolas Louis de Lacaille named some regions of the southern sky that had not yet been named. In contrast to the classic constellations, which are named after mythological figures, his constellations mostly bore the names of technical achievements. He named the constellation air pump in 1752 after the technical device air pump , which was invented by Otto von Guericke and further developed by Robert Boyle .
Celestial objects
Stars
| B. | MR | Names, other names | m | M> | Lj | Spectral class |
|---|---|---|---|---|---|---|
| α | 4104 | Alpha Antliae | 4.28 | −0.97 | 366 | K4 III |
| ε | 3765 | Epsilon Antliae | 4.51 | −2.18 | 710 | K3 III |
| ι | 4273 | Iota Antliae | 4.60 | 0.77 | 190 | K0 III |
| θ | 3871 | Theta Antliae | 4.78 | −0.58 | 384 | A7 V |
| η | 3947 | Eta Antliae | 5.23 | 2.66 | 106 | A8 IV |
| 4086 | 5.34 | 2.3 | 132 | A8 V | ||
| 4313 | 5.43 | −0.63 | 530 | A0 V | ||
| 4049 | 5.44 | −3.68 | 2200 | B9.5 Ib / II | ||
| 3770 | 5.49 | −1.36 | 760 | K2 III CNII | ||
| 4153 | 5.50 | −1.54 | 840 | C5 | ||
| 4049 | 5.52 | |||||
| δ | 4118 | Delta Antliae | 5.55 | 481 | ||
| ζ1 | 3780, 3781 |
Zeta Antliae | 5.76 (6.19 / 6.96) |
372 | ||
| ζ 2 | 3789 | Zeta Antliae | 5.93 | 374 |
The brightest star α Antliae has an apparent magnitude of 4.28 mag and is an orange star of the spectral class K4 III, 366 light years away . It should just develop into a changeable Mira star . The second brightest is ε Antliae , which is also an orange giant with the similar spectral type K3. At the opposite end of the air pump is its third brightest star ι Antliae , which belongs to the spectral type K0 and shines like the two previously mentioned stars as an orange giant.
Multiple stars
| system | Overall brightness | distance | component | m |
|---|---|---|---|---|
| θ | 4.78 | 0.1 " | A (HR 3871) | 5.30 |
| B (HR 3871) | 6.18 | |||
| δ | 5.55 | 11.0 " | A (HR 4118) | 5.58 |
| B (HR 4118) | 9.65 | |||
| ζ 1 | 5.76 | 8.0 " | A (HR 3781) | 6.19 |
| B (HR 3780) | 6.96 |
ζ 1 Antliae is a binary star system 372 light years away.
Variable stars
| star | m | Type |
|---|---|---|
| S Ant (HR 3798) | 6.3 to 6.8 | W-Ursae-Majoris variable |
| U Ant (HR 4153) | 5.5 to 7.1 | irregularly variable |
S Antliae is a W-Ursae-Majoris variable about 245 light-years away , the apparent magnitude of which fluctuates between 6.3 and 6.8 mag with a period of 0.65 days. U Antliae is a deep red variable star belonging to the spectral class C5 at a distance of 840 light years. It changes its brightness without any discernible periodicity.
Deep sky objects
| Identifier | m | Type |
|---|---|---|
| NGC 2997 | 9.4 m | Galaxy |
| PGC 29194 | 14.8 | Galaxy |
NGC 2997 is a spiral galaxy of the Sc type, the plane of which is inclined at about 45 ° in our line of sight.
PGC 29194 is a faint dwarf galaxy belonging to the local group .
The Antlia galaxy cluster is a galaxy cluster located in this constellation .
See also
Web links
- Cross reference for 10 stars of the constellation.