| Observation data Epoch J2000 |
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|---|---|
| Constellation (pronunciation) |
Taurus |
| Right ascension | 04h 21m 59. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Each culture has its own Constellations usually based on Mythology. Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 4345s |
| Declination | +19° 32' 06. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either 429" |
| Apparent magnitude (V) | 9. The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 6 |
| Characteristics | |
| Spectral type | G5V:e |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | 24. In Astronomy, stellar classification is a classification of Stars based initially on photospheric temperature and its associated Spectral characteristics In Astronomy, the color index is a simple numerical expression that determines the color of an object which in the case of a Star gives its Temperature In Astronomy, the color index is a simple numerical expression that determines the color of an object which in the case of a Star gives its Temperature For the astronomical object see Variable star. Variable Star is a 2006 novel written by Spider Robinson Astrometry is the branch of Astronomy that relates to precise measurements and explanations of the positions and movements of Stars and other celestial bodies Radial velocity is the Velocity of an object in the direction of the line of sight (i 6 km/s |
| Proper motion (μ) | RA: 15. The proper motion of a Star is the measurement of its change in position in the sky over time after Improper motions are accounted for 45 mas/yr Dec. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun : -12. 48 mas/yr |
| Parallax (π) | 5. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun Parallax is an apparent displacement or difference of orientation of an object viewed along two different lines of sight and is measured by the angle or semi-angle of inclination between 66 ± 1. 58 mas |
| Distance | approx. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. Distance is a numerical description of how far apart objects are 600 ly (approx. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 180 pc) |
| Absolute magnitude (MV) | ? |
| Details | |
| Mass | ? M☉ |
| Radius | ? R☉ |
| Luminosity | ? L☉ |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
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V* T Tau, HBC 35, AG+19° 341, HD 284419, BD+19° 706, HH 355, HIC 20390, HIP 20390, JP11 3794, VDB 28. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 In Astronomy, absolute magnitude (also known as absolute visual magnitude) is the Apparent magnitude an object would have if it were at a standard Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object The solar mass is a standard way to express Mass in Astronomy, used to describe the masses of other Stars and galaxies. Remote Authentication Dial In User Service ( RADIUS) is a networking protocol that provides centralized access authorization and accounting management for people or computers In Astronomy, the solar radius is a unit of Length used to express the size of Stars It is equal to the current radius of the Sun. Luminosity has different meanings in several different fields of science The solar luminosity, L_\odot is a unit of Luminosity ( power emitted in the form of Photons conventionally used by Astronomers to Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic In Astronomy and Physical cosmology, the metallicity of an object is the proportion of its matter made up of Chemical elements other than Hydrogen Stellar rotation is the angular motion of a Star about its axis A star is a massive luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue
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T Tauri is a variable star in the constellation Taurus, the prototype of the T Tauri stars. For the astronomical object see Variable star. Variable Star is a 2006 novel written by Spider Robinson In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Taurus (it looks like a bull (ˈtɔrəs bull, symbol, Unicode ♉ is one of the Constellations of the Zodiac. T Tauri stars ( TTS) are a class of variable Stars named after their prototype – T Tauri. It was discovered in October 1852 by John Russell Hind, and is part of the Hyades cluster, not far from ε Tauri. Year 1852 ( MDCCCLII) was a Leap year starting on Thursday (link will display the full calendar of the Gregorian calendar (or a Leap year Life and work John Russell Hind was born in 1823 in Nottingham. The Hyades ( Greek Ὑάδες also known as Melotte 25 or Collinder 50 or Caldwell 41 is the nearest Open cluster to the Epsilon Tauri (ε Tau / ε Tauri is an Orange giant Star, spectral type of K0 III located approximately 155 Light-years away from the
Like all T Tauri stars, it is very young, being only a million years old. Its distance from Earth is about 460 light years, and its apparent magnitude varies unpredictably from about 9. EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001 A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 3 to 14.
The T Tauri system consists of at least three stars, only one of which is visible at optical wavelengths; the other two shine in the infrared and one of them also emits radio waves. Through VLA radio observations, it was found that the young star (the "T Tauri star" itself) dramatically changed its orbit after a close encounter with one of its companions and may have been ejected from the system. The Very Large Array ( VLA) is a Radio astronomy Observatory located on the Plains of San Augustin, between the towns of Magdalena
Physically nearby is NGC 1555, a reflection nebula known as Hind's Nebula or Hind's Variable Nebula. NGC 1555 is a Variable nebula located in the Constellation Taurus. In Astronomy, reflection nebulae are clouds of dust which are simply reflecting the light of a nearby Star or stars It is illuminated by T Tauri, and thus also varies in brightness. The nebula NGC 1554 was likewise associated with T Tauri and was observed in 1868 by Otto Struve, but soon disappeared or perhaps never existed, and is known as "Struve's Lost Nebula". Year 1868 ( MDCCCLXVIII) was a Leap year starting on Wednesday (link will display the full calendar of the Gregorian Calendar (or a Leap Not to be confused with his grandfather Otto Wilhelm von Struve (1819 &ndash 1905 ---- Otto Struve ( August 12 1897 –
A Herbig-Haro object also appears to be associated with Hind's nebula, or perhaps with the T Tauri system itself. Herbig-Haro objects are small patches of nebulosity associated with newly-born Stars and are formed when Gas ejected by young Stars collides
The T Tauri wind, so named because this young star is currently in this stage, is a phase of stellar development between the accretion of material from the slowing rotating material of a solar nebula and the ignition of the Hydrogen that has agglomerated into the protostar. The T Tauri wind &mdash so named because of the young star currently in this stage &mdash is a phenomenon indicative of the phase of stellar development between the accretion of A protostar is a large object that forms by contraction out of the gas of a Giant molecular cloud in the Interstellar medium. A protostar is the denser parts of a cloud core, typically with a mass around 104 solar masses in the form of gas and dust, that collapses under its own weight/gravity, and continues to attract matter.
The protostar, at first, only has about 1% of its final mass. But the envelope of the star continues to grow as infalling material is accreted. After a few million years, thermonuclear fusion begins in its core, then a strong stellar wind is produced which stops the infall of new mass. The protostar is now considered a young star since its mass is fixed, and its future evolution is now set.
External links
- AAVSO Variable Star of the Month Profile of T Tauri
- http://www.kencroswell.com/TTauri.html
- http://www.spaceref.com/news/viewpr.html?pid=10340
- http://www.daviddarling.info/encyclopedia/T/T_Tauri.html
- [Simbad]
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