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8 Lacertae B (Companion Star) Facts

8 Lacertae B Facts

8 Lacertae B's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR8603. HIP111544 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD214168.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 8 Lacertae B with it shortened to 8 Lac B.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+38 4808A.

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

Location of 8 Lacertae B

The location of the main sequence 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 object is compared to the celestial equator and is expressed in degrees. For 8 Lacertae B, the location is 22h 35m 52.10 and +39° 37` 41.4 .

Physical Properties (Colour, Temperature) of 8 Lacertae B

8 Lacertae B has a spectral type of B2V. This means the star is a blue main sequence star. The star has a B-V Colour Index of -0.14 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 13,196 Kelvin.

8 Lacertae B 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 459,707.95.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

8 Lacertae B Apparent and Absolute Magnitudes

8 Lacertae B has an apparent magnitude of 6.60 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 2.16 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 8 Lacertae B

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.92 which gave the calculated distance to 8 Lacertae B as 252.45 light years away from Earth or 77.40 parsecs. It would take a spaceship travelling at the speed of light, 252.45 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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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Additional 8 Lacertae B Facts and Figures

Visual Facts


Primary / Proper / Traditional Name8 Lacertae B
Alternative NamesHD 214168, HIP 111544, HR 8603, 8 Lac B, BD+38 4808A
Spectral TypeB2V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type main sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationLacerta
Absolute Magnitude 2.16
Visual / Apparent Magnitude6.60
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)22h 35m 52.10
Declination (Dec.)+39° 37` 41.4
Galactic Latitude-16.15 degrees
Galactic Longitude96.37 degrees
Distance from Earth12.92 Parallax (milliarcseconds)
 252.45 Light Years
 77.40 Parsecs
 15,964,784.76 Astronomical Units
B-V Index-0.14
Radial Velocity-11.70 ± 0.90 km/s
Associated / Clustered Stars 8 Lacertae

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)0.66
Effective Temperature13,196 Kelvin

Sources and Links


SIMBAD SourceLink

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
214168B6.60000-20.0000015.00000B5Blue/White1831
C10.500001903
+38 4810.0D9.30000-5.00000-2.000001902

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