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HD 75289
Observation data
Epoch 2000
Constellation
(pronunciation)		 Vela
Right ascension 8h 47m 40. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. 2000 ( MM) was a Leap year that started on Saturday of the Common Era, in accordance with the Gregorian calendar. 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. Vela (ˈviːlə Sails) is a southern Constellation, one of the three parts into which Argo Navis was split (the others being Carina and Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 39s
Declination -41° 44' 12. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either 45"
Apparent magnitude (V) 6. 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 36
Distance 94. The cosmic distance ladder (also known as the Extragalactic Distance Scale) is the succession of methods by which astronomers determine the Distances to celestial 36 ly
(28. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 94 pc)
Spectral type G0 V
Other designations
CD-41°4507, HIP 43177

HD 75289 is a 6th magnitude star in the constellation of Vela. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 In Astronomy, stellar classification is a classification of Stars based initially on photospheric temperature and its associated Spectral characteristics A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue 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 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 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 Vela (ˈviːlə Sails) is a southern Constellation, one of the three parts into which Argo Navis was split (the others being Carina and Like our Sun, it is a yellow dwarf but slightly more massive, hotter and luminous. The Sun (Sol is the Star at the center of the Solar System. The main sequence is the name for a continuous and distinctive band of stars that appear on a plot of stellar color versus brightness The spectral type of the star is G0 V. In Astronomy, stellar classification is a classification of Stars based initially on photospheric temperature and its associated Spectral characteristics Under exceptionally good circumstances it might be visible to the unaided eye; however, usually binoculars are needed. Binocular telescopes, or binoculars (also known as field glasses are two identical or Mirror - symmetrical telescopes mounted side-by-side and

In 1999 a planet was discovered orbiting the star, and in 2004 a possible red dwarf companion was detected. A planet, as defined by the International Astronomical Union (IAU is a celestial body Orbiting a Star or stellar remnant that is According to the Hertzsprung-Russell diagram, a red dwarf star is a small and relatively cool Star, of the Main sequence, either late K


Contents

HD 75289 b

HD 75289 b
Discovery
Discovered by Udry et al.
Discovery date 1999
Detection method Radial velocity
Semi-major axis 0. Any Planet is an extremely faint light source compared to its parent Star. In Physics, an orbit is the gravitationally curved path of one object around a point or another body for example the gravitational orbit of a planet around a star In Geometry, the semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae 0482 ± 0. 0028 AU
Eccentricity 0. The astronomical unit ( AU or au or au or sometimes ua) is a unit of Length based on the distance from the Earth to the In Astrodynamics, under standard assumptions, any Orbit must be of Conic section shape 034 ± 0. 029
Orbital period 3. The orbital period is the time taken for a given object to make one complete Orbit about another object 509267 ± 0. 000064 d
Angular distance 2 mas
Longitude of periastron 141°
Time of periastron 2,450,830. A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the In Mathematics (in particular Geometry and Trigonometry) and all Natural sciences (including astronomy geophysics etc the angular distance A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. In Astrodynamics, the longitude of the periapsis (symbolized \varpi of an orbiting body is the Longitude (measured from the point of the vernal equinox In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 34 ± 0. 48 JD
Semi-amplitude 54. The Julian date (JD is the interval of time in days and fractions of a day since 4713 B Amplitude is the magnitude of change in the oscillating variable with each Oscillation, within an oscillating system 9 ± 1. 8 m/s
Physical characteristics
Mass >0. Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object 467 ± 0. 041 MJ

HD 75289 b is an extrasolar planet orbiting the star HD 75289. An extrasolar planet, or exoplanet, is a Planet beyond the Solar System, orbiting around other Stars As of September 2008 312 It has a mass half that of Jupiter, and it orbits in a very short orbit completing one revolution around the star in three and a half days. A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the By studying the starlight scientists have concluded that the planet must have an albedo less than 0. The albedo of an object is the extent to which it diffusely reflects light from the sun 12, rather low for a gas giant. A gas giant (sometimes also known as a Jovian planet after the planet Jupiter, or giant planet) is a large Planet that is not primarily Otherwise its reflected light would have been detected.


HD 75289 B

HD 75289
Observation data
Epoch 2000
Constellation
(pronunciation)		 Vela
Right ascension 8h 47m 42. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. 2000 ( MM) was a Leap year that started on Saturday of the Common Era, in accordance with the Gregorian calendar. 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. Vela (ˈviːlə Sails) is a southern Constellation, one of the three parts into which Argo Navis was split (the others being Carina and Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 24s
Declination -41° 44' 7. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either 70"
Apparent magnitude (V) ?
Distance 94. 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 The cosmic distance ladder (also known as the Extragalactic Distance Scale) is the succession of methods by which astronomers determine the Distances to celestial 36? ly
(28. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 94? pc)
Spectral type M2-M5 V
Other designations
n/a

HD 75289 B is a possible red dwarf star orbiting HD 75289. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 In Astronomy, stellar classification is a classification of Stars based initially on photospheric temperature and its associated Spectral characteristics A star catalogue, or star catalog, is an Astronomical catalogue that lists Stars In Astronomy, many stars are referred to simply by catalogue According to the Hertzsprung-Russell diagram, a red dwarf star is a small and relatively cool Star, of the Main sequence, either late K The stars share the same proper motion so they are likely related. 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 Apparent distance between the two stars is about 21. 5 arcseconds, at a distance of 94 light years that would be 621 astronomical units. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by The astronomical unit ( AU or au or au or sometimes ua) is a unit of Length based on the distance from the Earth to the However, the radial distance between the stars is unknown, so they are likely further apart. In any case, one revolution around the primary would take thousands of years to complete.

The study that found the red dwarf also rules out any further stellar companions beyond 140 AUs and massive brown dwarf companions from 400 AU up to 2000 AU. Brown dwarfs are sub- stellar objects with a mass below that necessary to maintain Hydrogen -burning Nuclear fusion reactions in their cores as do stars


References

External links

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