Mensa (constellation)
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Mensa | |
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| Missing image
Mensa_constellation_map.png Mensa click for larger image | |
| Abbreviation | Men |
| Genitive | Mensae |
| Symbology | the Table |
| Right ascension | ?????? h |
| Declination | −??????° |
| Area | ?????? sq. deg. Ranked ??????th |
| Number of stars (magnitude < 3) | ?????? |
| Brightest star | α Mensae (App. magnitude 5.09) |
| Meteor showers |
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| Bordering constellations | |
| Visible at latitudes between +??????° and −90° Best visible during the month of January | |
Mensa (Latin for Table) is a southern constellation which was first introduced by Nicolas Louis de Lacaille under the name Mons Mensae (Latin for table mountain). This specifically refers to Table Mountain in South Africa, where Lacaille made important early observations of the southern sky. It contains no bright stars, with Alpha Mensae its brightest star at a barely visible magnitude 5.09, but it does contain part of the Large Magellanic Cloud (the rest being in Dorado).
The constellation covers a keystone-shaped wedge of sky stretching from approximately 4h to 7.5h of right ascension, and −71 to −85.5 degrees of declination. Other than the south polar constellation of Octans, it is the most southerly of constellations. As a result, it is essentially unobservable from the Northern Hemisphere. Besides those already mentioned, its other neighbouring constellations are Chamaeleon, Hydrus and Volans.
The first images taken by the Chandra X-Ray Observatory were of PKS 0637-752, a quasar in Mensa with a large gas jet visible in both optical and x-ray wavelengths.
History
Since Mensa was introduced in the 17th century, and lies close to the south, it was not known to classical or early cultures, and so they produced no mythology concerning it.
Stars
- Stars with Bayer designations:
- α Men 5.08; β Men 5.30; γ Men 5.18; δ Men 5.67; ε Men 5.54; ζ Men 5.61; θ Men 5.45; η Men 5.47; ι Men 6.04; κ Men 5.46; λ Men 6.54; μ Men 5.53; ν Men 5.78; ξ Men 5.84; π Men 5.65
- Stars with Flamsteed designations:
- 31 Men 6.18
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Constellations introduced by the monk Nicolas Louis de Lacaille in 1763 |
| Antlia | Caelum | Circinus | Horologium | Mensa | Microscopium | Norma | Octans | Pictor | Reticulum | Sculptor |
| The 88 modern Constellations |
| Andromeda | Antlia | Apus | Aquarius | Aquila | Ara | Aries | Auriga | Boötes | Caelum | Camelopardalis | Cancer | Canes Venatici | Canis Major | Canis Minor | Capricornus | Carina | Cassiopeia | Centaurus | Cepheus | Cetus | Chamaeleon | Circinus | Columba | Coma Berenices | Corona Australis | Corona Borealis | Corvus | Crater | Crux | Cygnus | Delphinus | Dorado | Draco | Equuleus | Eridanus | Fornax | Gemini | Grus | Hercules | Horologium | Hydra | Hydrus | Indus | Lacerta | Leo | Leo Minor | Lepus | Libra | Lupus | Lynx | Lyra | Mensa | Microscopium | Monoceros | Musca | Norma | Octans | Ophiuchus | Orion | Pavo | Pegasus | Perseus | Phoenix | Pictor | Pisces | Piscis Austrinus | Puppis | Pyxis | Reticulum | Sagitta | Sagittarius | Scorpius | Sculptor | Scutum | Serpens | Sextans | Taurus | Telescopium | Triangulum | Triangulum Australe | Tucana | Ursa Major | Ursa Minor | Vela | Virgo | Volans | Vulpecula |