Displaying items by tag: Nebula
Messier 45, one of the more famous open clusters. Often called the Pleiades or the Seven Sisters, with the name Pleiades coming from Greek mythology. The cluster has been known since ancient times, and can be seen as a grouping of 6-7 stars, so it was interesting that Charles Messier included it in his catalog of objects that are not a comet, but could be mistaken for one.
The cluster is surrounded by a reflection nebula that the group is currently passing through, and not related to its original birth in a compact nebula. The cluster consist of at least 1,000 stars located in a radius of 8 light years. The cluster is dominated by hot blue luminous stars, but also contains many brown dwarfs that are not massive enough to initiate nuclear fusion. The estimated age of the cluster is around 100 million years, and its expected to take 250 million years to disperse due to gravitational interactions.
Also a bright knot was discovered around Merope by astronomer Edward Barnard that is being eaten away by the intense radiation from Merope. Due to the dazzling light from Merope, it is difficult to see, and later given the designation of IC 349, or is sometimes referred to as Barnard's Merope Nebula or Merope's Companion.
So named because of its changing light and dark patterns on the nebula is though to be caused by dust clouds near the illuminating source by the star R Monocerotis casting shadows on the nebula. The star itself a T Tauri variable, is encased dense clouds of dust.
The patterns are know to change over weeks and months. Discovered by William Herschel and studied by Edin Hubble.
Emission nebula NGC 1491, sometimes called the Fossil Footprint Nebula located in Perseus. Located about 10,700 light years away. Illuminated by a 11.2 magnitude star actually blowing a bubble in the nebula from its intense stellar "wind".
Messier 42, The Orion Nebula is one of the most iconic deep sky objects and one of the brightest nebula, it can be seen as a fuzzy star in the sword of Orion figure. Illuminated by a central cluster of stars, the four primary ones are referred to as the Trapezium, for their shape of a trapezoid. As a stellar nursery it is in the process of forming new stars as pockets of the nebula collapse under gravity.
Messier 1 or the Crab Nebula, a supernova remnant from a star that went supernova in 1054 observed and recorded by Chinese astronomers. Being so bright, it was even visible in the day time. All that remains of the star is a neutron star that spins at 30 times a second that emits pulses of radiation. Such stars are called pulsars as the beam from their magnetic poles causes a pulse of radiation as they rotate. The expanding nebula is illuminated by the radiation outpouring from the pulsar and is expanding at the rate of 1,500 km/s.
Image of part of an young emission nebula that spans 40 light years across located in Cepheus. The cluster is mostly illuminated by a star named BD+66, one of the hottest stars at 100,000 times more luminous than our sun. A young stellar nursery that is forming new stars from the clouds of dust and gas.
Random objects, with emission nebula Sh 2-101, aka the Tulip Nebula on the left, blue super-giant star HD226868 and its unseen black hole companion Cygnus X-1 center (lower) bright star, and shining brilliantly the multiple star system Eta Cygni on the right.
NGC 7380 or often called the Wizard Nebula is a open cluster and nebula located in Cepheus. Difficult to see visually, this image is enhanced with Ha and SIII narrow band filters.
NGC 7129 is a reflection nebula located in Cepheus. Light reflecting off the surrounding dust and gas from young hot new stars gives a bluish glow. The cluster consists of around 130 stars and is estimated to be around 1 million years old.
Wide-field mosaic of Messier 8 The Lagoon Nebula and Messier 20 The Trifid Nebula. Messier 8 is an emission nebula HII region in Sagittarius. Several collapsing clouds know as Bok globules are visible which may eventually collapse down to form new stars. Messier 20 is highlighted by three different types of nebula. The red parts are an emission nebula, the blue parts are a reflection nebula, and the dark bands are dark nebula which are clouds of dust and gas blocking light from behind.