The constellation Chamaeleontis
- Nome latino
- Emisfero sud
- June - August
- 132 deg²
- Brightest star
- α Chamaeleontis (HIP number 40702)
- Planetary nebulae, open star clusters, molecular clouds
The Chamaeleon (Latin: Chamaeleontis) is a small and inconspicuous constellation in the southern sky. It was introduced by Dutch sailors Frederick de Houtman and Pieter Dirkszoon Keyser between 1595 and 1597. It is in a region of the sky with some interesting objects, such as a series of molecular clouds.
Hemisphere, visibility, and area
The constellation of Chamaeleon is located in the southern hemisphere near the South Celestial Pole, the fixed extension of the earth's axis. Due to its location, it cannot be observed north of the equator. It is only visible up to 5° north latitude, which is roughly equivalent to Bogota in Colombia. In the southern hemisphere, it can be seen all the way to the South Pole.
The months of June to August offer the best time for observing the Chamaeleon.
It stretches across an area of approximately 132 square degrees in the night sky. With this size, it ranks 79th among all 88 constellations.
Its size and faint stars make it difficult to locate the Chamaeleon in the night sky. There are no bright stars in the region of the constellation, as it contains only stars that are not brighter than fourth magnitude.
To find it anyway, it is helpful to look for the bright star Miaplacidus (Latin: β Carinae) in the neighboring constellation Carina. Due to its brightness, this star can easily be found. Miaplacidus is located north of the Chamaeleon constellation.
Other neighbors include Volans and Mensa to the east, as well as Octans and Apus to the south. The Musca constellation borders it to the west. They can also serve as good reference points.
Most visualizations show only three stars in Chamaeleon, which are connected by a line with a slight bend. The brightest of these three stars is α Chamaeleontis (Alpha Chamaeleontis). It is a whitish-bluish star with an apparent magnitude of about 4. The star is roughly 80 light-years from earth.
Specialties in the constellation
Various deep-sky objects are located in the area of the Chamaeleon, including a planetary nebula, an open star cluster, and several molecular clouds.
The planetary nebula bears the catalog number NGC 3195 and is not exceptionally bright. It has an apparent magnitude of only around 11.6 and is, therefore, not visible to the naked eye. It was discovered by the British astronomer John Herschel in February 1835.
The numerous molecular clouds in the constellation are known as Chamaeleon Dark Clouds. They are a striking group of stars and consist of a mass of gas and dust that corresponds to tens of thousands of solar masses. Their distance from earth is estimated to be 400 to 600 light-years.
The Dutch expedition in 1595, which set out to reach the legendary Spice Islands in the south, conducted a research project to measure and document the positions of all bright stars in the southern hemisphere.
Pieter Dirkszoon Keyer, the navigator of the fleet, measured the positions of 135 stars, and together with Frederick de Houtman, the brother of the fleet commander, they defined 12 new constellations.
The Latin name Chamaeleontis was eventually chosen due to their extended stay on the island of Madagascar, where they observed many chameleons.Pubblicato
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