The primary is of magnitude 3.2 and the secondary is of magnitude 4.3. Achernar is the hottest and bluest in color out of the ten brightest stars in the night sky. Rana (Delta Eridani) is a subgiant star located in the constellation of Eridanus, River Eridanus . However, recently, two meteor showers have been discovered, the Nu Eridanids, and the Omicron Eridanids. Several notable stars are located in Eridanus, such as Achernar, Cursa, Acamar, 39 Eridani, 40 Eridani, p Eridani, or Ran which hosts a planet very similar to Jupiter. Beta Eridani, traditionally called Cursa, is a blue-white star of magnitude 2.8, 89 light-years from Earth. click here. Observers from places farther north than 32o . Eridanus Constellation | Star Map & Facts | Go Astronomy This star is an evolved white-hued giant star that has around 200% of our Suns mass, and 240% of its radius. But, if you lose track? And then theres the The Eridanus Supervoid, an area of space that contains no galaxies and was discovered by analyzing cold spots in the Cosmic Microwave Background (CMB). First conflated with the Nile River in Egypt, the constellation was also identified with the Po River in Italy. Eridanus lies south of the Ecliptic, which is different to the Celestial Equator. This treatise, known as the Almagest, would be used by medieval European and Islamic scholars for over a thousand years to come, effectively becoming astrological and astronomical canon until the early Modern Age. This incredible barred spiral galaxy is one of my personal favorites. The secondary star has around 240% of our Suns mass, and it is the hottest of the pair, having temperatures of around 9,200 K. 39 Eridani is a binary star system that has a combined apparent visual magnitude of 4.87. It is represented as a long, winding river that starts at the left foot of Orion in the north, sweeps south of Taurus, west to the edge of Cetus, and back east to Caelum. USS Eridanus (AK-92) was a United States Navy Crater class cargo ship named after the constellation. At a diameter of about one billion light years it is the second largest known void, superseded only by the Giant Void in Canes Venatici. It is believed to be associated with the star Rigel in the neighboring constellation of Orion, and is also suspected to be the remains of a very old supernova, although there is no certainty on either theory. While there is no consensus on the origins of this constellation, one theory is that it takes its name from the Star of Eridu, which is named for the ancient Babylonian city in southern modern-day Iraq. While the Omicron pairing appears connected, dont be fooled. This star is 6.1 billion years old, and it is about to join the red giant branch. The Nine Planets has been online since 1994 and was one of the first multimedia websites that appeared on the World Wide Web. Eridanus contains no Messier objects but does have a few dozen faint galaxies and nebulas. From here on Earth, it is seen between latitudes +32o and -90o. Content from this Website may not be used in any form without written permission from the site owner. Cursa (Beta Eridani), the constellations second most luminous star, is a blue-white giant situated 89 light years from our solar system with an apparent magnitude of 2.796, although being a variable star this can vary from between 2.72 and 2.80. This includes the bright elliptical galaxy NGC 1395; as well as the giant elliptical galaxy NGC 1407, and the spiral galaxy NGC 1332, both of which are surrounded by smaller sub-groups within the Eridanus Group. Finally, an Explanation for the Cold Spot in the Cosmic Microwave Eridanus is the sixth largest constellation, covering an area of 1,138 square degrees. Eridanus (constellation) - Wikipedia Ford. Eridanus Constellation Eridanus, the River (Eri) ( ih-RID-un-us) The Southern constellation of Eridanus, the River, is best viewed in Winter during the month of December. From most of the U.S., the River disappears before its end below the southern horizon. Today, in honor of the late and great Tammy Plotner, we take a look at the winding river the Eridanus constellation. Cetus ( / sits /) is a constellation, sometimes called 'the whale ' in English. The stars of the modern constellation of Fornax were formally part of Eridanus. Its main asterism consists of four stars, and twenty stars in total are brighter than magnitude 6.5 . 16" (400m) telescope = 16 A couple of supernovas have been observed here. Star Constellation Facts: Eridanus - Stars & Location - Astronomy Trek Observations indicate that its radius is about 50% larger at the equator than at the poles. The Eridanus Cloud, also known as the Eridanus Group, is a nearby loose grouping of galaxies at a mean distance of around 75 million light-years. Hawaiian Astronomical Society - Eridanus In Homers day in ancient Greece, people thought that the River of Ocean encircled a flat Earth. Cursa) a blue giant that lies approximately 89 light years from Earth near the border with Orion. The Source of the light is Rigel in the nearby Orion constellation. The image showing the Eridanus constellation was generated using Night Vision, a free-to-use and download application by Brian Simpson. The boundary of the Eridanus constellation contains 26 stars that host known exoplanets. Corrections? A "potentially hazardous" asteroid bigger than any building in the world will pass by Earth on Tuesday. Eridanus (/rdns/) is a constellation in the southern celestial hemisphere. The chariot veered off course and scorched the heavens and the Earth. Based on the star's spectral type (A3 IVn), Cursa's colour is blue . Eridanus is a long constellation which snakes its way from the feet of Orion, close to the celestial equator, all the way down to Tucana at a declination of almost 60S. Constellation. the Eridanus Cloud), a group of about 200 galaxies located roughly 75 million light years from Earth. Eridanus belongs to the Heavenly Waters family of constellations, together with Carina, Columba, Delphinus, Equuleus, Piscis Austrinus, Puppis, Pyxis, and Vela. Why search for such a faint constellation? For some time, the constellation of Eridanus wasnt associated with any meteor showers. Facts Rana is the traditional/proper name for the star, whilst Delta Eridani is the Bayer classification for the star. Eridanus is called Srotaswini in Sanskrit, srtas meaning the course of a river or stream. The other two weak showers includes the Nu Eridanids which runs from August 30th to September 12th; and the Omicron Eridanids which occurs between November 1st to 10th when less than one meteor per hour may be observed. Eridanus Constellation | Facts, Information, Mythology, History In 2020, she was the Education Prize from the American Astronomical Society, the largest organization of professional astronomers in North America. Be sure to look from a dark location. NGC 1535, also called Cleopatras Eye Nebula, is a planetary nebula that was discovered by astronomer William Herschel in 1785. EarthSky 2022 lunar calendars now available! Although classified as a main-sequence dwarf star, Alpha shines 3,000 times more luminous than our Sun and its the least spherical star in the Milky Way studied to date. It is a Super-Earth type of planet, being one of the closest to us, and it lies in the stars habitable zone. Its main component is an A4 star that is orbited by an A1 star. NGC 1232 is an intermediate spiral galaxy situated at around 60 million light-years away. At about one billion light years in diameter, this is the largest supervoid ever discovered. There are three major superclusters within 500 light years of the solar system: The Hyades, The Pleiades, and very close to us, The Sirius Supercluster. At its southern end is the magnitude 0.5 star Achernar, designated Alpha Eridani. The faint star has an apparent magnitude of 6. The constellation was supposed to be the path Phaethon drove along; in later times, it was considered a path of souls. Based on parallax measurements taken by the Gaia mission, it is about 16.3 light-years from the Sun . One of the 48 constellations listed by the 2nd century astronomer Ptolemy, it remains one of the 88 modern constellations. The constellation Eridanus contains no Messier objects, but it does have some notable stars and deep sky objects, among which is the bright star Achernar, seven known stars with planets, and the mysterious Eridanus Supervoid, an empty region of space that defies explanation. There are several other noteworthy stars in Eridanus, including some double stars. Eridanus lies across the sky. Today, Eridanus is among the 88 modern constellations where it holds the sixth place in terms of size, stretching for around 1138 square degrees. This ancient constellation continues to be one of the 88 modern constellations recognized by the International Astronomical Union (IAU). Zaurak is an evolved red giant currently on the asymptotic giant branch of the Hertzsprung-Russell diagram. The constellation was sometimes the path Phaethon drove; other times, it was the path of souls. Rigel (Beta Orionis) Facts: Size, Mass, Luminosity, Name, Constellation Helios agreed, however, he advised his son to follow the beaten track where he saw wheel marks. The Eridanus Constellation spreads on 1138 square degrees, being the sixth largest constellation in the night sky among the 88 modern constellations. The only void to surpass the Eridanus Supervoid is the Super Void discovered in Canes Venatici. Eridanus is the sixth largest of the modern constellations. Remember the brightest of these are two elliptical galaxies 1399 and 1404. Before we leave galaxy country, turn your telescope towards NGC 1385 (RA 03h 37m 28.7s Dec -24 30 07.2). These are large, young, massive stars that if we at a greater distance would appear as a open cluster they move in tandem with each other. 40 Eridani - Wikipedia Love the night sky? 40 Eridani B is a white dwarf star that has only 57% of our Suns mass, 1.4% of its radius, however, it is around three times hotter, with temperatures of around 16,500 K. 40 Eridani C is a red dwarf star that has only 20% of our Suns mass, 31% of its radius, and it is also cooler, with surface average temperatures at only 3,100 K. p Eridani is also a binary star system, located at around 25.5 light-years away from us. The third brightest star is Theta Eridani (Acamar), a binary star that may be part of a multiple star system located 161 light years away. Specifically, it is depicted as the Ganges on the head of Dakshinamoorthy or Nataraja, a Hindu incarnation of Shiva. NGC 1427A is similar to the Large Magellanic Cloud, being 20,000 light-years across. The Eridanus Cluster is a galaxy cluster roughly 23 Mpc (75 Mly) from Earth, containing about 73 main galaxies and about 200 total galaxies. Models suggest that the gas in a bar can be funneled inwards, and then spiral into the center through the grand-design disk, where it can potentially fuel a central black hole. box below and click the search button: Home Page | Explore the The Sea | Explore the The Sky, Space News | Astronomy Resources | Astronomy Events Calendar It is a binary system, composed of the blue main-sequence star Achernar A, and an A-type star designated as Achernar B. Dwarf satellite galaxies that orbit the Milky Way Galaxy located in the constellation Eridanus. This is the constellation Eridanus the River, and Achernar is its brightest star. Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Our editors will review what youve submitted and determine whether to revise the article. It was one of the 48 constellations listed by the second century astronomer Ptolemy. Eridanus is located in the first quadrant of the Southern hemisphere (SQ1) and can be seen at latitudes between +32? Eridanus is also home to several Deep Sky Objects like the Witch Head Nebula, a faint reflection nebula located approximately 1000 light years from Earth. Eridanus constellation is located in the Southern Sky or the southern celestial hemisphere. Look for Achernar from southerly latitudes The ninth-brightest star in all the heavens, Achernar, is well known to . The southern stars cannot be fully seen in China, and were not incorporated until the late 16th/early 17th century by astronomer Xu Guangqi, which introduced these and other southern asterisms based European star charts. Its place to the south of Orion's foot gives it its name, which means "the footstool". The Nu Eridanids radiate from the constellation between August 30 and September 12 every year, while the showers parental body remains an unidentified Oort Cloud object. Rana has around 133% of our Suns mass, 232% of its radius, and it is 3 times brighter than our Sun. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. While every effort has been made to follow citation style rules, there may be some discrepancies. Its a very large, faint reflection nebula illuminated by neighboring Rigel and the results can be quite impressive! 11 Southern Hemisphere Constellations You Should Know - Mental Floss When he tried to fly his fathers chariot, he was unable to control the horses. Eridanus Constellation has 32 stars with known planets, but only 19 stars have official names. There are at least three meteor showers associated with the constellation Eridanus, the most prominent being the Eta Eridanids, which runs from late July to August 14th, with its peak on the 8th/9th when up to 6 meteors an hour can be seen. In all respects, this is one very disturbed galaxy. Cursa is the second brightest star in Eridanus at magnitude 2.79. In Chinese astronomy, the northern part is located within the White Tiger of the West (, X Fng Bi H). Typically, it is within the boundaries of the constellation or was once until it (the boundary) was redrawn. The brightest is Achemar with a visual magnitude of 0.46. The constellation Eridanus showing common, 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27. Going fast! NGC 1300 is a barred spiral galaxy located at around 61 million light-years away from us. Helios, being stricken with grief, did not drive his chariot for days, leaving the world in darkness. It's as far as you can from the brightest star in a single constellation. Phaethon was the son of Helios, the god of the sun. It is represented as a celestial river, and it is one of the 88 modern constellations, being the sixth-largest in the sky. It is also home to the exoplanet Epsilon Eridani b (aka. The genitive form is Eridani, which means anything at the end of its name infers a relationship to the constellation. Eridanus is part of the Heavenly Waters family of constellations, together with Carina, Columba, Delphinus, Equuleus, Piscis Austrinus, Puppis, Pyxis, and Vela. The constellation of Eridanus hosts many interesting deep-sky objects such as the planetary nebula NGC 1535, the reflection nebula IC 2118, the galaxies NGC 1232, NGC 1234, NGC 1291, or the spiral galaxy NGC 1300. At the very top of the star is Cursa, the second brightest star in the Eridanus constellation. The Earth is tilted at an angle of 23.44, which is why the two differ and why we have, The following constellations surround Eridanus :-, 18 Eridani is one of the closest stars to. 4" (100mm) telescope = 12.5 Dont forget, there are many more wonderful objects to be explored in Erindanus, so get yourself a good star chart to navigate by and go sailing on the River! Eridanus stretches out for over 1138 square degrees. The brightest among them is Achenar, a bright, blue B-type star located about 144 light-years from Earth. The Eridanus Constellation Welcome to another edition of Constellation Friday! At magnitude 2.91, Zaurak is the constellations third brightest star. These include a reflection nebula called the Witch Head Nebula and group of over 200 galaxies known as the Eridanus group. This galaxy has an apparent magnitude of 15.3. The third-brightest, gamma Eri, is Zaurak (meaning . Only because its beautiful. The mythology of Eridanus ties it to Phaethon. It is located in the first quadrant of the southern hemisphere (SQ1) and can be seen at latitudes between +32 and -90. The primary star, Achernar, is the least spherical star in the Milky Way, this is because it spins very fast, having a rotational velocity of around 250 km / 155.3 mi per second. Currently, around 32 stars in Eridanus have been discovered to host planets. Perhaps Zeus intervened by sending a thunderbolt to stop him. The stars mentioned are from the Hipparcos catalogue or have been added because of their special status. Stretching across 14 constellations, the stream is about 1,300 light-years long. Achernar is also the least spherical star to be observed in our galaxy, which is a consequence of its very rapid rotation. When is the Eridanus Constellation Visible, The brightest star in Eridanus constellation is, The nearest star to Earth that is located in the constellation of Eridanus is. The 41 additional constellations added in the 16th, 17th and 18th centuries. Rivers. Also see all Milky Way satellite galaxies. About 30% have Hubble classifications of elliptical or S0 and the remaining 70% are spiral or irregular. Eridanus is the 6th largest constellation. Rana, designated as Delta Eridani, is a subgiant star, and it is a suspected RS Canum Venaticorum variable star, since its apparent magnitude changes between 3.51 to 3.56. It takes very, very well to magnification so dont be afraid to use those high power eyepieces. You are able to see the Witch-Head nebula, a reflection nebula that is lit up by radiation from Rigel in neighbouring Orion constellation. The stars that correspond to Eridanus are also depicted as a river in Indian astronomy starting close to the head of Orion just below Auriga. The Nu Eridanids and Omicron Eridanids are now the official first meteor showers associated with the constellation. . The next views are binocular width, showing stars to mag. It is also the second longest constellation in the night sky. [11], According to one theory, the Greek constellation takes its name from the Babylonian constellation known as the Star of Eridu (MUL.NUN.KI). Achernar is the brightest star in Eridanus, having an apparent magnitude of 0.40. The primary star has around 177% of our Suns mass, 1,200% of its radius, however, it is cooler, with surface temperatures recorded at only 4,641 K. 39 Eridani B is 1.3 times brighter than our Sun, having an apparent magnitude of 8.68. At present, there are no explanations as to how such a huge area of space could be empty, but some investigators are inclining to the controversial idea that the area represents a type of quantum entanglement between our Universe and another, neighboring universe. Its one planet, with an approximate mass of one Jupiter mass, has a period of 7 years. The Eridanus Supervoid (CBM Cold Spot/WMAP Cold Spot), or supervoids in general, are huge regions in space that are completely devoid of galaxies, and while several others are known, the Eridanus Supervoid stretches over about a billion light years, making it the biggest yet discovered. Phaethon was the son of the Sun god Helios and the Oceanid Clymene. The faint H II region Sharpless 278 lies just north of Rigel. Eridanus, constellation in the southern sky at about 4 hours right ascension and that stretches from the celestial equator to about 60 south in declination. 39 Eridani is a binary star also divisible in small amateur telescopes, 206 light-years from Earth. It has the Bayer designation Omicron2 Eridani, which is Latinized from 2 Eridani and abbreviated Omicron 2 Eri or 2 Eri. Hubble space telescope = 30 Zaurak (Gamma Eridani) is a giant star located in the constellation of Eridanus, River Eridanus.It is not part of the Eridanus constellation outline but is within the borders of the constellation. Dominic This galaxy is part of the Eridanus Group of galaxies. Eridanus, the River Constellation | TheSkyLive.com Here is What Are The Constellations?,What Is The Zodiac?, and Zodiac Signs And Their Dates. Cursa is located in the constellation Eridanus.Representing the celestial River, Eridanus is one of the Greek constellations, first catalogued by Claudius Ptolemy in the 2nd century CE.It is traditionally depicted as a river flowing from Orion all the way to the far southern sky, where the bright Achernar (Alpha Eridani) marks its end. The stars traditional name comes from the Arabic Akhir an-nahr, which means the end of the river, which corresponds to the fact that Acamar was once the brightest star in the constellation and was seen as the end of the celestial river, Eridanus. Zaurak (Gamma Eridani), the third most luminous star in Eridanus, is a red giant found 150 light year away. . Be sure to check out The Messier Catalog while youre at it! A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. Eridanus is the sixth largest constellation in the night sky, occupying an area of 1138 square degrees. The Ecliptic is the path that the Earth takes around the Sun. It has an apparent magnitude of 13.4. The primary is a yellow-hued star of magnitude 4.8 and the secondary is a blue-green star of magnitude 6.1. The center of the bar shows an unusual structure: within the overall spiral structure, a grand design spiral that is 3,300 light-years in diameter exists. All content on this site is Copyright 1998 - 2016 by Sea and Sky. Cursa (Beta Eridani) is a subgiant star located in the constellation of Eridanus, River Eridanus . How to choose your telescope magnification? list of 88 official modern constellations. Pyxis belongs to the Heavenly Waters family of constellations, along with Carina, Columba, Delphinus, Equuleus, Eridanus, Piscis Austrinus, Puppis and Vela. Now lets get out the telescope and have a look around. Theres also the Eridanus Group (aka. In simple terms, the area is thought by some to be a point of contact between different universes, and despite the best efforts of dozens of investigators, no amount of computer modelling has ever been able to explain the void in terms of any of the current, accepted theoretical models of the origin of the universe. NGC 1187 is a spiral galaxy located 60 million light-years away of magnitude 11.4. The brightest star in Eridanus, alpha Eri, is Achernar (meaning "end of the river"); it is the 9th brightest star in the sky (magnitude 0.46). Many of the stars of Eridanus cant be seen from China, and thus, the Chinese selected the northern part of Eridanus to be located within the White Tiger of the West, while the unseen southern part was classified among the Southern Asterisms. Zeus intervened by striking Phaethon dead with a thunderbolt and casting him to Earth. You can't just go to one location and arrive in Eridanus constellation, this is because it is made up of stars at different positions and distances. Not only is it the biggest known asteroid coming within 2.3 million miles of Earth this year,. This great barred spiral gives an awesome view in even the smallest of scopes. Pronunciation: ih-RID-un-us Meaning: Eridanus is visible to observers at latitudes between +32 and -90 and is best seen at culmination during the month of December. NGC 1232 is part of the Eridanus cluster of galaxies, along with NGC 1300. Phaethon wanted to drive his father's sky chariot, but was unable to control it. These are the brightest and easiest-to-find double, triple, and quadruple star systems in the constellation Eridanus . We detail facts about stars and deep space objects (e.g. As it was scaring the people below, Zeus threw fire bolts at the chariot to stop him. 10, deepsky objects to mag. Within this group are a spiral galaxy called NGC 1187, a barred spiral galaxy known as NGC 1300, and a beautiful face-on spiral galaxy called NGC 1232. There are only four stars in Eridanus that are brighter than magnitude 4, while 24 stars are classified as the constellations main stars. Sort of like a game of cosmic connect-the-dots, stargazers draw lines between bright stars to form familiar shapes. Some Scientists Certainly Think So. Eridanus Definition & Meaning - Merriam-Webster With such a huge constellation to explore, its a cinch to know that well not be able to reveal everything that can be seen with a telescope or binoculars, but lets try highlight a few favorites. It is a major star and forms part of the outline. This. The name Acamar derives from the Arabic for the end of the river , which is actually marked by the star Achernar, but since it was not visible from ancient Greece, both Ptolemy and Hipparchus chose Acamar to denote the termination of Eridanus the River, instead. It's brightest star is Achernar at magnitude 0.46. Zaurak derives from the Arabic for the boat. NGC 1531 and NGC 1532 are both small dwarf galaxies that seem to interact with each other. It is located at around 10.4 light-years away from the Solar System. Eridanus contains several notable stars, the most famous of which is Achernar, or Alpha Eridani. Achernar lies at the far southern end of the river's path; its name is Since the cosmic microwave background radiation is relatively uniform, with only very slight variations in temperature, the void was exposed by linking the discovery of a huge cold spot with the observed absence of radio galaxies. Theta Eridani, called Acamar, is a binary star with blue-white components, distinguishable in small amateur telescopes and 161 light-years from Earth. If youd like to tour some variable stars in Eridanus with your binoculars, have a look at Gamma, Delta, Lambda and Nu Eridani. Cursa (Beta Eridani) Star Facts (Distance, Mass, Colour & more) 5 Bizarre Paradoxes Of Time Travel Explained, 10 Interesting Nikola Tesla Facts And Quotes, James Webb Telescope Turns Its Attention To The Kuiper Belt. Zaurak is 1,259 times brighter than our Sun, and it has around 8,000% of our Suns mass. Eridanus is located in the first quadrant of the southern hemisphere (SQ1) and can be seen at latitudes between +32o and -90o. Located about 70 million light-years away, NGC 1232 is dominated by millions of bright stars and dark dust, in spiral arms rotating about the center. NGC 1187 is a spiral galaxy located at around 60 million light-years away from us. It is the sixth largest of the modern constellations, and the one that extends farthest in the sky from north to south. In 2019, a team led by Stefan Meingast at the University of Vienna used data from the European Space Agency's Gaia mission to discover the Pisces-Eridanus stream, named for the constellations containing the greatest concentrations of stars. The constellation of Eridanus hosts a supervoid, designated as the Eridanus Supervoid it is the second-largest known void. Eridanus is located near the constellations Fornax and Lepus. [1], Epsilon Eridani (the proper name is Ran[2]) is a star with one extrasolar planet similar to Jupiter. It is a blue-white main sequence star located 139 light years from Earth.

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