Table of Contents
36 relations: Angular distance, Apparent magnitude, Bayer designation, Binary star, Bright Star Catalogue, Constellation, Durchmusterung, Effective temperature, Epoch (astronomy), Eridanus (constellation), Flamsteed designation, Flux, Giant star, Henry Draper Catalogue, Hertzsprung–Russell diagram, Hipparcos, Horizontal branch, International Celestial Reference System and its realizations, Light-year, Minute and second of arc, Monthly Notices of the Royal Astronomical Society, Nuclear fusion, Red clump, Rho1 Eridani, Rho3 Eridani, Smithsonian Astrophysical Observatory Star Catalog, Solar luminosity, Solar mass, Solar radius, Star, Stellar atmosphere, Stellar classification, Stellar evolution, Stellar parallax, Sun, X-ray astronomy.
Angular distance
Angular distance or angular separation is the measure of the angle between the orientation of two straight lines, rays, or vectors in three-dimensional space, or the central angle subtended by the radii through two points on a sphere.
See Rho2 Eridani and Angular distance
Apparent magnitude
Apparent magnitude is a measure of the brightness of a star or other astronomical object.
See Rho2 Eridani and Apparent magnitude
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name.
See Rho2 Eridani and Bayer designation
Binary star
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.
See Rho2 Eridani and Binary star
Bright Star Catalogue
The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars, Yale Bright Star Catalogue, or just YBS, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth. Rho2 Eridani and bright Star Catalogue are bright Star Catalogue objects.
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Constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.
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Durchmusterung
In astronomy, Durchmusterung or Bonner Durchmusterung (BD) is an astrometric star catalogue of the whole sky, published by the Bonn Observatory in Germany from 1859 to 1863, with an extension published in Bonn in 1886.
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Effective temperature
The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.
See Rho2 Eridani and Effective temperature
Epoch (astronomy)
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity.
See Rho2 Eridani and Epoch (astronomy)
Eridanus (constellation)
Eridanus is a constellation which stretches along the southern celestial hemisphere.
See Rho2 Eridani and Eridanus (constellation)
Flamsteed designation
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.
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Flux
Flux describes any effect that appears to pass or travel (whether it actually moves or not) through a surface or substance.
Giant star
A giant star has a substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
See Rho2 Eridani and Giant star
Henry Draper Catalogue
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars. Rho2 Eridani and Henry Draper Catalogue are Henry Draper Catalogue objects.
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Hertzsprung–Russell diagram
The Hertzsprung–Russell diagram (abbreviated as H–R diagram, HR diagram or HRD) is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities and their stellar classifications or effective temperatures.
See Rho2 Eridani and Hertzsprung–Russell diagram
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
See Rho2 Eridani and Hipparcos
Horizontal branch
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's. Rho2 Eridani and horizontal branch are horizontal-branch stars.
See Rho2 Eridani and Horizontal branch
International Celestial Reference System and its realizations
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).
See Rho2 Eridani and International Celestial Reference System and its realizations
Light-year
A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 1012 km), which is approximately 5.88 trillion mi.
See Rho2 Eridani and Light-year
Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol, is a unit of angular measurement equal to of one degree.
See Rho2 Eridani and Minute and second of arc
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal in astronomy, astrophysics and related fields.
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Nuclear fusion
Nuclear fusion is a reaction in which two or more atomic nuclei, usually deuterium and tritium (hydrogen isotopes), combine to form one or more different atomic nuclei and subatomic particles (neutrons or protons).
See Rho2 Eridani and Nuclear fusion
Red clump
The red clump is a clustering of red giants in the Hertzsprung–Russell diagram at around 5,000 K and absolute magnitude (MV) +0.5, slightly hotter than most red-giant-branch stars of the same luminosity.
See Rho2 Eridani and Red clump
Rho1 Eridani
Rho1 Eridani (Rho1 Eri, ρ1 Eri), is a star located in the constellation Eridanus. Rho2 Eridani and Rho1 Eridani are bright Star Catalogue objects, Eridanus (constellation), Henry Draper Catalogue objects, Hipparcos objects, horizontal-branch stars and k-type giants.
See Rho2 Eridani and Rho1 Eridani
Rho3 Eridani
Rho3 Eridani, Latinized from ρ3 Eridani, is a star located in the constellation Eridanus. Rho2 Eridani and Rho3 Eridani are bright Star Catalogue objects, Eridanus (constellation), Henry Draper Catalogue objects and Hipparcos objects.
See Rho2 Eridani and Rho3 Eridani
Smithsonian Astrophysical Observatory Star Catalog
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue, created by Smithsonian Institution, a research institute.
See Rho2 Eridani and Smithsonian Astrophysical Observatory Star Catalog
Solar luminosity
The solar luminosity is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun.
See Rho2 Eridani and Solar luminosity
Solar mass
The solar mass is a standard unit of mass in astronomy, equal to approximately.
See Rho2 Eridani and Solar mass
Solar radius
Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun.
See Rho2 Eridani and Solar radius
Star
A star is a luminous spheroid of plasma held together by self-gravity.
Stellar atmosphere
The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
See Rho2 Eridani and Stellar atmosphere
Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
See Rho2 Eridani and Stellar classification
Stellar evolution
Stellar evolution is the process by which a star changes over the course of its lifetime and how it can lead to the creation of a new star.
See Rho2 Eridani and Stellar evolution
Stellar parallax
Stellar parallax is the apparent shift of position (parallax) of any nearby star (or other object) against the background of distant stars.
See Rho2 Eridani and Stellar parallax
Sun
The Sun is the star at the center of the Solar System.
X-ray astronomy
X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray observation and detection from astronomical objects.
See Rho2 Eridani and X-ray astronomy
References
Also known as 9 Eridani, Rho2 Eri, Ρ2 Eridani.