Eridanus (/ ɪ ˈ r ɪ d ən ə s /) is a constellation in the southern celestial hemisphere.It is represented as a river.One of the 48 constellations listed by the 2nd century astronomer Ptolemy, it remains one of the 88 modern constellations.It is the sixth largest of the modern constellations, and the one that extends farthest in the sky from north to south.

LP 890-9, also known as SPECULOOS-2 or TOI-4306, is a high proper motion red dwarf star located 105 light-years (32 pc) away from the Solar System in the constellation of Eridanus.The star has 12% the mass and 15% the radius of the Sun, and a temperature of 2,871 K (2,598 °C; 4,708 °F).As of 2022, it is the second-coolest star found to host a planetary system, after …

Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" (Chinese 星 官 xīng guān).. The Chinese asterisms are generally smaller than the constellations of Hellenistic tradition. The Song dynasty (13th-century) Suzhou planisphere shows a total of 283 asterisms, comprising a total of 1,565 individual stars.

Cassiopeia is a constellation in the northern sky named after the vain queen Cassiopeia, mother of Andromeda, in Greek mythology, who boasted about her unrivaled beauty.Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today.It is easily recognizable due to its distinctive 'W' shape, …

Chinese star names (Chinese: 星 名, xīng míng) are named according to ancient Chinese astronomy and astrology.The sky is divided into star mansions (星 宿, xīng xiù, also translated as "lodges") and asterisms (星 官, xīng guān). The system of 283 asterisms under Three Enclosures and Twenty-eight Mansions was established by Chen Zhuo of the Three Kingdoms period, who …

This is a list of brown dwarfs.These are objects that have masses between heavy gas giants and low-mass stars. The first isolated brown dwarf discovered was Teide 1 in 1995. The first brown dwarf discovered orbiting a star was Gliese 229 B, also discovered in 1995. The first brown dwarf found to have a planet was 2M1207, discovered in 2004. As of 2015, more than 2,800 …

Chamaeleon was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman. It first appeared on a 35-cm diameter celestial globe published in 1597 (or 1598) in Amsterdam by Plancius and Jodocus Hondius. Johann Bayer was the first uranographer to put Chamaeleon in a celestial atlas. It was one of …

40 Eridani is a triple star system in the constellation of Eridanus, abbreviated 40 Eri.It has the Bayer designation Omicron 2 Eridani, which is Latinized from ο 2 Eridani and abbreviated Omicron 2 Eri or ο 2 Eri.Based on parallax measurements taken by the Gaia mission, it is about 16.3 light-years from the Sun.. The primary star of the system, designated 40 Eridani A and …

All stars but one can be associated with an IAU constellation. IAU constellations are areas of the sky. Although there are only 88 IAU constellations, the sky is actually divided into 89 irregularly shaped boxes as the constellation Serpens is split into two separate sections, Serpens Caput (the snake's head) to the west and Serpens Cauda (the snake's tail) to the east.

SN 1054 is a supernova that was first observed on c. 4 July 1054, and remained visible until c. 6 April 1056. α. The event was recorded in contemporary Chinese astronomy, and references to it are also found in a later (13th-century) Japanese document, and in a document from the Islamic world.Furthermore, there are a number of proposed, but doubtful, references from European …