Universe Guide

Batentaban Borealis (Chi Draconis, 44 Draconis) Star Facts

Batentaban Borealis Facts

Batentaban Borealis's Alternative Names

Chi Draconis (Chi Dra) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR6927. HIP89937 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD170153. The Gliese ID of the star is GL 713A. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 44 Draconis. The Flamsteed name can be shortened to 44 Dra.

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+72 839.

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

Location of Batentaban Borealis

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 Batentaban Borealis, the location is 18h 21m 02.34 and +72° 44` 01.3 .

Radial Velocity and Proper Motion of Batentaban Borealis

Proper Motion

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 -349.71 ± 0.80 milliarcseconds/year towards the north and 531.21 ± 0.87 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 31.90 km/s with an error of about 0.14 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Batentaban Borealis 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 2.12 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, Age) of Batentaban Borealis

Batentaban Borealis Colour and Temperature

Batentaban Borealis has a spectral type of F7Vvar. This means the star is a yellow to white main sequence star.

The star's effective temperature is 6,122 Kelvin which is hotter than our own Sun's effective Temperature which is 5,777 Kelvin.

Batentaban Borealis Radius

Radius has been calculated as being 1.20 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 837,926.39.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. The star's Iron Abundance is -0.58 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 5.30 Billion years old but could be between 4.20 and 6.10 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Batentaban Borealis Apparent and Absolute Magnitudes

Batentaban Borealis has an apparent magnitude of 3.55 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 4.02 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 Batentaban Borealis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 124.11 which gave the calculated distance to Batentaban Borealis as 26.28 light years away from Earth or 8.06 parsecs. If you want that in miles, it is 17,623,805,010.

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*.

Travel Time to Batentaban Borealis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A38073623,945,387.24
Speed of Sound (Mach 1)767.26922,969,525.69
Concorde (Mach 2)1,534.5411,484,747.88
New Horizons Probe33,000534,054.70
Speed of Light670,616,629.0026.28

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 Batentaban Borealis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBatentaban Borealis
Alternative NamesChi Draconis, Chi Dra, HD 170153, HIP 89937, HR 6927, 44 Draconis, 44 Dra, BD+72 839, Gliese 713A
Spectral TypeF7Vvar
Constellation's Main StarYes
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
Age5.30 Billion Years Old
Age Range4.20 - 6.10 Billion Years Old
Absolute Magnitude 4.02
Visual / Apparent Magnitude3.55
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 21m 02.34
Declination (Dec.)+72° 44` 01.3
Galactic Latitude28.06 degrees
Galactic Longitude103.46 degrees
Distance from Earth124.11 Parallax (milliarcseconds)
 26.28 Light Years
 8.06 Parsecs
 1,662,482.75 Astronomical Units
Galacto-Centric Distance24,142.61 Light Years / 7,402.00 Parsecs
Proper Motion Dec.-349.71 ± 0.80 milliarcseconds/year
Proper Motion RA.531.21 ± 0.87 milliarcseconds/year
B-V Index0.48
Radial Velocity31.90 ± 0.14 km/s
Iron Abundance-0.58 ± 9.99 Fe/H
Semi-Major Axis14584.00
Stellar Luminosity (Lsun)2.12
Orbital Period (Days)280.55
Argument Of Periastron119.20

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)1.20
Effective Temperature6,369 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
170153+72 839.0A3.70000522.00000-356.00000F8Yellow/White

Draco Main Stars

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