NGC 1858 (also known as ESO 56-SC74) is a bright, large, irregular
open cluster
An open cluster is a type of star cluster made of tens to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and ...
and
emission nebula
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star. Among the several different types of emission n ...
. It is found in the
Dorado
Dorado (, ) is a constellation in the Southern Sky. It was named in the late 16th century and is now one of the 88 modern constellations. Its name refers to the mahi-mahi (''Coryphaena hippurus''), which is known as ''dorado'' ("golden") in Sp ...
constellation. It is located in the
Large Magellanic Cloud
The Large Magellanic Cloud (LMC) is a dwarf galaxy and satellite galaxy of the Milky Way. At a distance of around , the LMC is the second- or third-closest galaxy to the Milky Way, after the Sagittarius Dwarf Spheroidal Galaxy, Sagittarius Dwarf ...
. It was first discovered by
James Dunlop
James Dunlop FRSE (31 October 1793 – 22 September 1848) was a Scottish astronomer, noted for his work in Australia. He was employed by Sir Thomas Brisbane to work as astronomer's assistant at his private observatory, once located at Param ...
on August 3, 1826, and was first recorded as Dunlop 120.
John Herschel
Sir John Frederick William Herschel, 1st Baronet (; 7 March 1792 – 11 May 1871) was an English polymath active as a mathematician, astronomer, chemist, inventor and experimental photographer who invented the blueprint and did botanical work. ...
recorded it on November 2, 1834. However, at the time, he did not associate it with Dunlop 120. Astronomers have now realised that Dunlop 120 and NGC 1858 are the same object.
See also
*
List of most massive stars
This is a list of the most massive stars that have been discovered, in solar mass units ().
Uncertainties and caveats
Most of the masses listed below are contested and, being the subject of current research, remain under review and subject to con ...
References
External links
*
Open clusters
Dorado
Emission nebulae
ESO objects
1858
Events
January–March
* January 9
** Revolt of Rajab Ali: British forces finally defeat Rajab Ali Khan of Chittagong.
** Anson Jones, the last president of the Republic of Texas, commits suicide.
* January 14 – Orsini affair: Pi ...
Astronomical objects discovered in 1826
Large Magellanic Cloud
{{Star-cluster-stub