Telescope (constellation)
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Constellation telescope |
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| Latin name | Telescopium |
| Latin genitive | Telescopii |
| Abbreviation | Tel |
| Right ascension | 18 h 09 m 14 s to 20 h 29 m 50 s |
| declination | −56 ° 59 ′ 02 ″ to −45 ° 05 ′ 24 ″ |
| surface | 251,512 deg² rank 57 |
| Completely visible | 32.5 ° N to 90 ° S |
| Observation time for Central Europe | not observable |
| Number of stars brighter than 3 mag | 0 |
| Brightest star (size) | Telescopii (3.51) |
| Meteor streams | |
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Neighboring constellations ( clockwise from north ) |
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| swell | IAU , |
 The constellation Telescopium, the telescope as it can be seen with the naked eye |
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The telescope ( Latin Telescopium ) is a constellation of the southern sky.
description
The telescope is an inconspicuous constellation south of Sagittarius (Sagittarius). Only one of its stars is brighter than the 4th magnitude .
history
The constellation was introduced in 1756 by the French astronomer Nicolas Louis de Lacaille .
It has nothing to do with the no longer used constellation Herschel's telescope in today's Fuhrmann, which was introduced by Hell in honor of the discovery of Uranus in 1789 .
Stars
| B. | F. | Names or other designations | m | Lj | Spectral class |
|---|---|---|---|---|---|
| α | 3.49 | 249 | B3 IV | ||
| ζ | 4.10 | 127 | G8 / K0 III | ||
| ε | 4.52 | 409 | G5 III | ||
| λ | 4.85 | 531 | A0 V | ||
| ι | 4.88 | 398 | G9 III | ||
| δ 1 | 4.92 | 796 | B6 IV | ||
| ξ | 4.93 m | 1250 | M1 II | ||
| η | 5.03 | 155 | A0 Vn | ||
| δ 2 | 5.07 | 1117 | B3 III | ||
| ρ | 5.17 | 171 | F7 V | ||
| κ | 5.18 | 293 | G8 / K0 III | ||
| ν | 5.33 | 170 | A9 Vn | ||
| HR 6819 | 5.36 | 743 | B3 IIpe | ||
| HR 7289 | 5.38 | 534 | K3 III | ||
| HR 6894 | 5.44 | 530 | K0 / K1 III | ||
| μ | 6.29 | 120 |
The brightest star in the telescope is the α Telescopii, 249 light years away. It is a bluish shining star with six times the mass and 200 times the luminosity of our sun .
ζ Telescopii is a yellow shining star of the spectral class G9 III, 127 light-years away .
Double stars
The stars δ 1 and δ 2 appear to the naked eye as double stars due to their small angular distance in the sky . In fact, they only stand in one direction when viewed from Earth. δ 1 is about 800 light years away, δ 2 more than 1100 light years away.
Variable stars
| star | m | period | Type |
|---|---|---|---|
| ξ | 4.93 | irregularly variable |
ξ Telescopii is a star 1250 light years away that changes its brightness with no discernible periodicity.
NGC objects
| Messier (M) | NGC | other | m | Type | Surname |
|---|---|---|---|---|---|
| IC 4699 | Planetary nebula | ||||
| 6584 | 9.2 | Globular clusters | |||
| 6725 | Galaxy | ||||
| 6754 | Galaxy | ||||
| 6761 | Galaxy | ||||
| 6851 | Galaxy |
NGC 6584 is a globular cluster 43,700 light years away . A larger telescope is needed to observe it.
