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HD 154088, HIP83541

HD 154088 is a orange to red main sequence dwarf star that can be located in the constellation of Ophiuchus. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it. HD 154088 has at least 1 Extrasolar Planets believed to be in orbit around the star.

HD 154088's Alternative Names

HIP83541 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD154088. The Gliese ID of the star is GL 652. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 73 G. Ophiuchi. There are no stars with a Gould designation in Ursa Major for example.

More details on star alternative names can be found at Star Names .

Location of HD 154088

The location of the star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For HD 154088, the location is 17h 04m 27.79 and -28° 34` 55.3 .

Proper Motion of HD 154088

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -268.69 ± 0.29 miliarcseconds/year towards the north and 83.76 ± 0.50 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 14.25000 km/s with an error of about 0.09 km/s .

HD 154088 Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 0.74 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of HD 154088

HD 154088 has a spectral type of K1V. This means the star is a orange to red main sequence dwarf star. The star is 7,382.00 Parsecs from the Galactic Centre or terms of Light Years is 24,077.38 s. The star has a B-V Colour Index of 0.81 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,261 Kelvin.

HD 154088 Radius has been calculated as being 0.98 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 681,081.67.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 0.97. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.27 with an error value of 0.02 Fe/H with the Sun has a value of 1 to put it into context.

HD 154088 Apparent and Absolute Magnitudes

HD 154088 has an apparent magnitude of 6.59 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of 5.30 If you used the 2007 Parallax value, you would get an absolute magnitude of 5.33. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to HD 154088

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 55.31 which gave the calculated distance to HD 154088 as 58.97 light years away from Earth or 18.08 parsecs. It would take a spaceship travelling at the speed of light, 58.97 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 56.06 which put HD 154088 at a distance of 58.18 light years or 17.84 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,382.00 Parsecs or 24,077.38 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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HD 154088 Facts

Visual Facts

Primary / Proper / Traditional NameHD 154088
Alternative NamesHD 154088, HIP 83541, 73 G. Ophiuchi, Gliese 652
Spectral TypeK1V
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour orange to red
GalaxyMilky Way
Absolute Magnitude5.30 / 5.33
Visual / Apparent Magnitude6.59
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)17h 04m 27.79
Declination (Dec.)-28° 34` 55.3
Galactic Latitude7.67 degrees
Galactic Longitude355.24 degrees
1997 Distance from Earth55.31 Parallax (milliarcseconds)
 58.97 Light Years
 18.08 Parsecs
2007 Distance from Earth56.06 Parallax (milliarcseconds)
 58.18 Light Years
 17.84 Parsecs
Galacto-Centric Distance24,077.38 Light Years / 7,382.00 Parsecs
Proper Motion Dec.-268.69 ± 0.29 milliarcseconds/year
Proper Motion RA.83.76 ± 0.50 milliarcseconds/year
B-V Index0.81
Radial Velocity14.25 ± 0.09 km/s
Iron Abundance0.27 ± 0.02 Fe/H
Semi-Major Axis7405.00
Stellar Luminosity (Lsun)0.74

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature5,261 Kelvin

Sources and Links

SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 154088

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
HD 154088 bConfirmed0.008118.5960.3820110.13162011.000

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