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Mirach (Beta Andromedae, 43 Andromedae) Star Facts

Mirach Facts

  • Mirach is a pulsating giant star that can be located in the constellation of Andromeda. The description is based on the spectral class.
  • Mirach is a main star of the constellation outline.
  • Based on the spectral type (M0IIIvar) of the star, the star's colour is red .
  • Mirach is the 54th brightest star in the night sky and the 2nd 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 197.44 light years away from us. Distance

Mirach's Alternative Names

Beta Andromedae (Bet And) 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 HR337. HIP5447 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD6860. The Gliese ID of the star is GL 53.3. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

Mirach has alternative name(s) :- , NSV 00414.

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 43 Andromedae. The Flamsteed name can be shortened to 43 And.

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+34 198.

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

Location of Mirach

The location of the giant 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 Mirach, the location is 01h 09m 43.80 and +35° 37` 15.0 .

Radial Velocity and Proper Motion of Mirach

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 -112.20 ± 0.41 milliarcseconds/year towards the north and 175.90 ± 0.56 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 0.06000 km/s with an error of about 0.13 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.

Physical Properties of Mirach

Mirach Temperature and Colour

Based on the star's spectral type of M0IIIvar , Mirach's colour and type is red giant star. The star has a B-V Colour Index of 1.5 which means the star's temperature is about 3,989 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Mirach 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 1,674.88 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Mirach Radius

Mirach estimated radius has been calculated as being 46.05 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 32,038,931.08.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 45.624004083568005487386645384. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

Mirach Iron Abundance

Mirach Iron Abundance is -0.03 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

Mirach Apparent and Absolute Magnitudes

Mirach has an apparent magnitude of 2.07 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 -1.86 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.84. 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 Mirach

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.36000 which gave the calculated distance to Mirach as 199.37 light years away from Earth or 61.12 parsecs. If you want that in miles, it is about 1,172,021,540,651,616.33, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 16.52000 which put Mirach at a distance of 197.44 light years or 60.53 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.

Using the 2007 distance, the star is roughly 12,485,121.72 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun. The star's Galacto-Centric Distance is 7,433.00 Parsecs or 24,243.72 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 Mirach

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)
Walking433,101,636,807.44
Car1201,103,387,893.58
Airbus A380736179,900,200.04
Speed of Sound (Mach 1)767.269172,568,613.13
Concorde (Mach 2)1,534.5486,284,194.11
New Horizons Probe33,0004,012,319.61
Speed of Light670,616,629.00197.44

Variable Type of Mirach

The star is a pulsating Semi-Regular Star w variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. Mirach brightness ranges from a magnitude of 2.198 to a magnitude of 2.154 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 days (variability).

Meteor Showers Radiating from near Mirach

The Daytime beta Andromedids Meteor Shower radiants from a point near this star. The meteor shower runs typically between with a peak date of 2nd February. The speed of a meteor in the shower is 26 Km/s.

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 Mirach Facts and Figures

Visual Facts


Primary / Proper / Traditional NameMirach
Alternative NamesBeta Andromedae, Bet And, HD 6860, HIP 5447, HR 337, 43 Andromedae, 43 And, BD+34 198, Gliese 53.3, NSV 00414
Spectral TypeM0IIIvar
Constellation's Main StarYes
Multiple Star SystemYes
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationAndromeda
Absolute Magnitude -1.86 / -1.84
Visual / Apparent Magnitude2.07
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)01h 09m 43.80
Declination (Dec.)+35° 37` 15.0
Galactic Latitude-27.10258550 degrees
Galactic Longitude127.10707766 degrees
1997 Distance from Earth16.36000 Parallax (milliarcseconds)
 199.37 Light Years
 61.12 Parsecs
2007 Distance from Earth16.52000 Parallax (milliarcseconds)
 197.44 Light Years
 60.53 Parsecs
 12,485,121.72 Astronomical Units
Galacto-Centric Distance24,243.72 Light Years / 7,433.00 Parsecs
Proper Motion Dec.-112.20000 ± 0.41000 milliarcseconds/year
Proper Motion RA.175.90000 ± 0.56000 milliarcseconds/year
B-V Index1.5
Radial Velocity0.06000 ± 0.13 km/s
Iron Abundance-0.0300 ± 9.99 Fe/H
Eccentricity0.24950
Semi-Major Axis5887.0000000
Stellar Luminosity (Lsun)1674.8800000
Brightest in Night Sky54th

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.035
Variable Magnitude Range (Brighter - Dimmer)2.154 - 2.198

Estimated Calculated Facts


Radius (x the Sun)45.62
Effective Temperature3,989 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
6860+34 198.0A2.40000179.00000-110.00000M1Red
B14.400001934
C12.900001937
D12.100001938
E11.800001909
F11.900001909
G11.900001878
H11.900001878
I11.400001879
BQ13.700001934

Location of Mirach in Andromeda


Mirach Location in Andromeda

The map was generated using Night Vision, an awesome free application by Brian Simpson.

Andromeda Main Stars


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