Universe Guide


HR 8832, HD219134, HIP114622

HR 8832 is a orange to red main sequence dwarf star that can be located in the constellation of Cassiopeia. HR 8832 is the brightest star in Cassiopeia based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP114622 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD219134. The Gliese ID of the star is Gliese GL892. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names. HR 8832 has at least 7 Extrasolar Planets believed to be in orbit around the star.

Location of HR 8832

The location of the star in the galaxy 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 HR 8832, the location is 23h 13m 14.74 and +57d10`03.5 .

Proper Motion of HR 8832

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 295.45 ± 0.22 miliarcseconds/year towards the north and 2,075.07 ± 0.29 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Metallicity, Radius) of HR 8832

HR 8832 has a spectral type of K3Vvar. This means the star is a orange to red main sequence dwarf star. The star is 7402.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24142.6107228800000000s. The star has a B-V Colour Index of 1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,849 Kelvin.

HR 8832 Radius has been calculated as being 0.66 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 461,338.45.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 0.67. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

The star's metallicity is 0.110000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

HR 8832 Apparent and Absolute Magnitudes

HR 8832 has an apparent magnitude of 5.57 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 6.50 If you used the 2007 Parallax value, you would get an absolute magnitude of 6.49. 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 HR 8832

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 153.24 which gave the calculated distance to HR 8832 as 21.28 light years away from Earth or 6.53 parsecs. It would take a spaceship travelling at the speed of light, 21.28 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 152.76 which put HR 8832 at a distance of 21.35 light years or 6.55 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 7,402.00 Parsecs or 24,142.61 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.

HR 8832 Facts

Alternative Names

Traditional/Proper NameHR 8832
Hipparcos Library I.D.114622
Bonner DurchmusterungBD+56 2966
Gliese ID892
Henry Draper Designation219134

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude6.50 / 6.49
Visual / Apparent Magnitude5.57
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 13m 14.74
Declination (Dec.)+57d10`03.5
Galactic Latitude-3.20 degrees
Galactic Longitude109.89 degrees
1997 Distance from Earth153.24 Parallax (milliarcseconds)
 21.28 Light Years
 6.53 Parsecs
2007 Revised Distance from Earth152.76 Parallax (milliarcseconds)
 21.35 Light Years
 6.55 Parsecs
Galacto-Centric Distance24,142.61 Light Years / 7,402.00 Parsecs
Proper Motion Dec.295.45 ± 0.22 milliarcseconds/year
Proper Motion RA.2075.07 ± 0.29 milliarcseconds/year
B-V Index1.00
Radial Velocity-18.83 ± 0.07 km/s
Iron Abundance0.07 ± 9.99 Fe/H
Spectral TypeK3Vvar
Colour(K) Orange to Red

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count7

Estimated Facts

Calculated Effective Temperature4,849 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
219134+56 2966.0A5.600002086.00000299.00000K2Orange
+56 2967.0B9.4000013.0000012.000001908

List of Extrasolar Planets orbiting HR 8832

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
Hd 219134 BConfirmed0.0123.093020150.0384785.000
Hd 219134 CConfirmed0.0116.764020150.06482
Hd 219134 DConfirmed0.06746.710020150.23508
Hd 219134 EConfirmed0.01171190.0000.3420152.56345.000
Hd 219134 FUnconfirmed0.02822.805020150.14574
Hd 219134 GConfirmed0.03494.200020150.3753
Hd 219134 HConfirmed0.282198.0000.3720153.064180.000

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