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66 Andromedae, HD15138, HIP11465, HR709

66 Andromedae is a blue to white main sequence dwarf star that can be located in the constellation of Andromeda. 66 Andromedae is the brightest star in Andromeda 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. The star has an estimated age of 1.90 Billion of Years but could be as young as 1.80 to 2.00 according to Hipparcos.

The Id of the star in the Yale Bright Star Catalogue is HR709. HIP11465 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD15138.

Location of 66 Andromedae

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 66 Andromedae, the location is 02h 27m 51.75 and +50d 34` 12.7 .

Proper Motion of 66 Andromedae

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 -90.71 ± 0.22 miliarcseconds/year towards the north and 32.23 ± 0.42 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Radius) of 66 Andromedae

66 Andromedae has a spectral type of F4V. This means the star is a blue to white main sequence dwarf star. The star is 7442.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24273.0760604800000000s. The star has a B-V Colour Index of 0.43 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,590 Kelvin.

66 Andromedae Radius has been calculated as being 2.22 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,547,362.49.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.37. 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 -0.14 with an error value of 0.08 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 1.90 Billion years old but could be between 1.80 and 2.00 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

66 Andromedae Apparent and Absolute Magnitudes

66 Andromedae has an apparent magnitude of 6.16 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 2.54 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.40. 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 66 Andromedae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 18.84 which gave the calculated distance to 66 Andromedae as 173.12 light years away from Earth or 53.08 parsecs. It would take a spaceship travelling at the speed of light, 173.12 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 17.69 which put 66 Andromedae at a distance of 184.38 light years or 56.53 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 7,442.00 Parsecs or 24,273.08 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.

66 Andromedae Facts

Alternative Names

Traditional/Proper Name66 Andromedae
Flamsteed Name66 Andromedae
Flamsteed Short Name66 And
Hipparcos Library I.D.11465
Yale Bright Star Catalogue (HR) Id709
Bonner DurchmusterungBD+49 666
Henry Draper Designation15138

Visual Facts

Star Typemain sequence dwarf star
Age1.90 Billion Years Old
Age Range1.80 - 2.00 Billion Years Old
Absolute Magnitude2.54 / 2.40
Visual / Apparent Magnitude6.16
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)02h 27m 51.75
Declination (Dec.)+50d 34` 12.7
Galactic Latitude-9.43 degrees
Galactic Longitude138.18 degrees
1997 Distance from Earth18.84 Parallax (milliarcseconds)
 173.12 Light Years
 53.08 Parsecs
2007 Revised Distance from Earth17.69 Parallax (milliarcseconds)
 184.38 Light Years
 56.53 Parsecs
Galacto-Centric Distance24,273.08 Light Years / 7,442.00 Parsecs
Proper Motion Dec.-90.71 ± 0.22 milliarcseconds/year
Proper Motion RA.32.23 ± 0.42 milliarcseconds/year
B-V Index0.43
Radial Velocity-5.30 ± 4.30 km/s
Iron Abundance-0.14 ± 0.08 Fe/H
Spectral TypeF4V
Colour(F) blue to white

Estimated Facts

Calculated Effective Temperature6,590 Kelvin

Sources and Links

SIMBAD SourceLink

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