Get it on Google Play
New! Download Unionpedia on your Android™ device!
Faster access than browser!

V838 Monocerotis

Index V838 Monocerotis

V838 Monocerotis (V838 Mon) is a red star in the constellation Monoceros about 20,000 light years (6 kpc) from the Sun. [1]

59 relations: Absolute magnitude, Andromeda Galaxy, Angular diameter, Apparent magnitude, Astronomical spectroscopy, Asymptotic giant branch, Betelgeuse, Binary star, Brown dwarf, Computer simulation, Constellation, Deuterium, Ellipsoid, European Space Agency, Extinction (astronomy), Galactic anticenter, Helium, Helium flash, Hubble Space Telescope, Hydrogen, Infrared, Interstellar medium, Jupiter, Light curve, Light echo, Light-year, List of largest stars, Luminosity, M31-RV, Main sequence, Milky Way, Minute and second of arc, Monoceros, NASA, Nebula, NGC 1893, Nova, Nuclear fusion, Palomar Testbed Interferometer, Parallax, Parsec, Planet, Sakurai's Object, Solar radius, South African Astronomical Observatory, Space Telescope Science Institute, Speed of light, Star, Star formation, Stellar evolution, ..., Sun, Supergiant star, Supernova, The New York Times, Thermodynamics, UBV photometric system, V1309 Scorpii, White dwarf, Wolf–Rayet star. Expand index (9 more) »

Absolute magnitude

Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.

New!!: V838 Monocerotis and Absolute magnitude · See more »

Andromeda Galaxy

The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way.

New!!: V838 Monocerotis and Andromeda Galaxy · See more »

Angular diameter

The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.

New!!: V838 Monocerotis and Angular diameter · See more »

Apparent magnitude

The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.

New!!: V838 Monocerotis and Apparent magnitude · See more »

Astronomical spectroscopy

Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light and radio, which radiates from stars and other celestial objects.

New!!: V838 Monocerotis and Astronomical spectroscopy · See more »

Asymptotic giant branch

The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.

New!!: V838 Monocerotis and Asymptotic giant branch · See more »


Betelgeuse, also designated Alpha Orionis (α Orionis, abbreviated Alpha Ori, α Ori), is the ninth-brightest star in the night sky and second-brightest in the constellation of Orion.

New!!: V838 Monocerotis and Betelgeuse · See more »

Binary star

A binary star is a star system consisting of two stars orbiting around their common barycenter.

New!!: V838 Monocerotis and Binary star · See more »

Brown dwarf

Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars, having masses between approximately 13 to 75–80 times that of Jupiter, or approximately to about.

New!!: V838 Monocerotis and Brown dwarf · See more »

Computer simulation

Computer simulation is the reproduction of the behavior of a system using a computer to simulate the outcomes of a mathematical model associated with said system.

New!!: V838 Monocerotis and Computer simulation · See more »


A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.

New!!: V838 Monocerotis and Constellation · See more »


Deuterium (or hydrogen-2, symbol or, also known as heavy hydrogen) is one of two stable isotopes of hydrogen (the other being protium, or hydrogen-1).

New!!: V838 Monocerotis and Deuterium · See more »


An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation.

New!!: V838 Monocerotis and Ellipsoid · See more »

European Space Agency

The European Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation of 22 member states dedicated to the exploration of space.

New!!: V838 Monocerotis and European Space Agency · See more »

Extinction (astronomy)

In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.

New!!: V838 Monocerotis and Extinction (astronomy) · See more »

Galactic anticenter

The galactic anticenter is a direction in space directly opposite to the Galactic Center, as viewed from Earth.

New!!: V838 Monocerotis and Galactic anticenter · See more »


Helium (from lit) is a chemical element with symbol He and atomic number 2.

New!!: V838 Monocerotis and Helium · See more »

Helium flash

A helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of low mass stars (between 0.8 solar masses and 2.0) during their red giant phase (the Sun is predicted to experience a flash 1.2 billion years after it leaves the main sequence).

New!!: V838 Monocerotis and Helium flash · See more »

Hubble Space Telescope

The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.

New!!: V838 Monocerotis and Hubble Space Telescope · See more »


Hydrogen is a chemical element with symbol H and atomic number 1.

New!!: V838 Monocerotis and Hydrogen · See more »


Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.

New!!: V838 Monocerotis and Infrared · See more »

Interstellar medium

In astronomy, the interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a galaxy.

New!!: V838 Monocerotis and Interstellar medium · See more »


Jupiter is the fifth planet from the Sun and the largest in the Solar System.

New!!: V838 Monocerotis and Jupiter · See more »

Light curve

In astronomy, a light curve is a graph of light intensity of a celestial object or region, as a function of time.

New!!: V838 Monocerotis and Light curve · See more »

Light echo

Reflected light following path B arrives shortly after the direct flash following path A but before light following path C. B and C have the same apparent distance from the star as seen from Earth. A light echo is a physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance.

New!!: V838 Monocerotis and Light echo · See more »


The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.

New!!: V838 Monocerotis and Light-year · See more »

List of largest stars

Below is an ordered list of the largest stars currently known by radius.

New!!: V838 Monocerotis and List of largest stars · See more »


In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.

New!!: V838 Monocerotis and Luminosity · See more »


M31-RV is a red variable star located in the Andromeda Galaxy that experienced an outburst in 1988, which is similar to the outburst V838 Monocerotis experienced in 2002.

New!!: V838 Monocerotis and M31-RV · See more »

Main sequence

In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.

New!!: V838 Monocerotis and Main sequence · See more »

Milky Way

The Milky Way is the galaxy that contains our Solar System.

New!!: V838 Monocerotis and Milky Way · See more »

Minute and second of arc

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.

New!!: V838 Monocerotis and Minute and second of arc · See more »


Monoceros (Greek: Μονόκερως) is a faint constellation on the celestial equator.

New!!: V838 Monocerotis and Monoceros · See more »


The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.

New!!: V838 Monocerotis and NASA · See more »


A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

New!!: V838 Monocerotis and Nebula · See more »

NGC 1893

NGC 1893 is an open cluster in the constellation Auriga.

New!!: V838 Monocerotis and NGC 1893 · See more »


A nova (plural novae or novas) or classical nova (CN, plural CNe) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months.

New!!: V838 Monocerotis and Nova · See more »

Nuclear fusion

In nuclear physics, nuclear fusion is a reaction in which two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles (neutrons or protons).

New!!: V838 Monocerotis and Nuclear fusion · See more »

Palomar Testbed Interferometer

The Palomar Testbed Interferometer (PTI) was a near infrared, long-baseline stellar interferometer located at Palomar Observatory in north San Diego County, California, United States.

New!!: V838 Monocerotis and Palomar Testbed Interferometer · See more »


Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

New!!: V838 Monocerotis and Parallax · See more »


The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.

New!!: V838 Monocerotis and Parsec · See more »


A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

New!!: V838 Monocerotis and Planet · See more »

Sakurai's Object

Sakurai's Object (V4334 Sgr) is a star in the constellation of Sagittarius.

New!!: V838 Monocerotis and Sakurai's Object · See more »

Solar radius

Solar radius is a unit of distance used to express the size of stars in astronomy.

New!!: V838 Monocerotis and Solar radius · See more »

South African Astronomical Observatory

South African Astronomical Observatory (SAAO) is the national centre for optical and infrared astronomy in South Africa.

New!!: V838 Monocerotis and South African Astronomical Observatory · See more »

Space Telescope Science Institute

The Space Telescope Science Institute (STScI) is the science operations center for the Hubble Space Telescope (HST; in orbit since 1990) and for the James Webb Space Telescope (JWST; scheduled to be launched in March 2021).

New!!: V838 Monocerotis and Space Telescope Science Institute · See more »

Speed of light

The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics.

New!!: V838 Monocerotis and Speed of light · See more »


A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

New!!: V838 Monocerotis and Star · See more »

Star formation

Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars.

New!!: V838 Monocerotis and Star formation · See more »

Stellar evolution

Stellar evolution is the process by which a star changes over the course of time.

New!!: V838 Monocerotis and Stellar evolution · See more »


The Sun is the star at the center of the Solar System.

New!!: V838 Monocerotis and Sun · See more »

Supergiant star

Supergiants are among the most massive and most luminous stars.

New!!: V838 Monocerotis and Supergiant star · See more »


A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.

New!!: V838 Monocerotis and Supernova · See more »

The New York Times

The New York Times (sometimes abbreviated as The NYT or The Times) is an American newspaper based in New York City with worldwide influence and readership.

New!!: V838 Monocerotis and The New York Times · See more »


Thermodynamics is the branch of physics concerned with heat and temperature and their relation to energy and work.

New!!: V838 Monocerotis and Thermodynamics · See more »

UBV photometric system

The UBV photometric system (Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a wide band photometric system for classifying stars according to their colors.

New!!: V838 Monocerotis and UBV photometric system · See more »

V1309 Scorpii

V1309 Scorpii (also known as V1309 Sco) is a contact binary that merged into a single star in 2008 in a process known as a luminous red nova.

New!!: V838 Monocerotis and V1309 Scorpii · See more »

White dwarf

A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.

New!!: V838 Monocerotis and White dwarf · See more »

Wolf–Rayet star

Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of highly ionised helium and nitrogen or carbon.

New!!: V838 Monocerotis and Wolf–Rayet star · See more »

Redirects here:

Firefox Nebula, Nova Monocerotis 2002, V0838 Monocerotis, V838 Mon.


[1] https://en.wikipedia.org/wiki/V838_Monocerotis

Hey! We are on Facebook now! »