Universe Guide

Cervantes (Mu Arae) Star Facts

Cervantes Facts

  • Cervantes is a main sequence star that can be located in the constellation of Ara. The description is based on the spectral class.
  • Cervantes is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G5V) of the star, the star's colour is yellow .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • It is calculated at being 6.410 Billion Years old. This information comes from ExoPlanet.
  • Cervantes has at least 4 Extrasolar Planets believed to be in orbit around the star.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 50.59 light years away from us. Distance

Cervantes's Alternative Names

Mu Arae (Mu. Ara) 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 HR6585. HIP86796 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD160691. The Gliese ID of the star is GL 691. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

Cervantes has alternative name(s) :- Mu Ara.

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

Location of Cervantes

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 Cervantes, the location is 17h 44m 08.72 and -51° 50` 00.9 .

Radial Velocity and Proper Motion of Cervantes

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 -190.60 ± 0.20 milliarcseconds/year towards the north and -16.85 ± 0.31 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 -9.36000 km/s with an error of about 0.00 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 Cervantes

Cervantes Temperature and Colour

Based on the star's spectral type of G5V , Cervantes's colour and type is yellow main sequence star. The star's effective temperature is 5,784 Kelvin which is hotter than our own Sun's effective Temperature which is 5,777 Kelvin.

Cervantes 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 2.05 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Cervantes Radius

Cervantes estimated radius has been calculated as being 1.44 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 999,773.62.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 1.4568590717482349939930906525. 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.

Cervantes Mass

The Cervantes's solar mass is 1.08 times that of our star, the Sun. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

Cervantes Metalicity

The star's metallicity is 0.280000, 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.

Cervantes Estimated Age

The star is believed to be about 6.41 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

Cervantes Apparent and Absolute Magnitudes

Cervantes has an apparent magnitude of 5.12 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 4.20 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.17. 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 Cervantes

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 65.46000 which gave the calculated distance to Cervantes as 49.83 light years away from Earth or 15.28 parsecs. If you want that in miles, it is about 292,931,902,345,739.29, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 64.47000 which put Cervantes at a distance of 50.59 light years or 15.51 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 3,199,144.85 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 7,386.00 Parsecs or 24,090.42 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 Cervantes

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 A38073646,095,781.60
Speed of Sound (Mach 1)767.26944,217,210.99
Concorde (Mach 2)1,534.5422,108,576.68
New Horizons Probe33,0001,028,075.61
Speed of Light670,616,629.0050.59

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 Cervantes Facts and Figures

Visual Facts

Primary / Proper / Traditional NameCervantes
Alternative NamesMu Arae, Mu. Ara, Mu Ara, HD 160691, HIP 86796, HR 6585, Gliese 691
Spectral TypeG5V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Age6.41 Billion Years Old
Absolute Magnitude 4.20 / 4.17
Visual / Apparent Magnitude5.12
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 44m 08.72
Declination (Dec.)-51° 50` 00.9
Galactic Latitude-11.49794455 degrees
Galactic Longitude340.06112576 degrees
1997 Distance from Earth65.46000 Parallax (milliarcseconds)
 49.83 Light Years
 15.28 Parsecs
2007 Distance from Earth64.47000 Parallax (milliarcseconds)
 50.59 Light Years
 15.51 Parsecs
 3,199,144.85 Astronomical Units
Galacto-Centric Distance24,090.42 Light Years / 7,386.00 Parsecs
Proper Motion Dec.-190.60000 ± 0.20000 milliarcseconds/year
Proper Motion RA.-16.85000 ± 0.31000 milliarcseconds/year
B-V Index0.69
Radial Velocity-9.36000 ± 0.00 km/s
Iron Abundance0.2700 ± 0.01 Fe/H
Semi-Major Axis7821.0000000
Stellar Luminosity (Lsun)2.0500000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count4

Estimated Calculated Facts

Radius (x the Sun)1.46
Effective Temperature5,594 Kelvin
Mass Compared to the Sun1.08

Sources and Links

SIMBAD SourceLink

List of Extrasolar Planets orbiting Cervantes

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
mu Ara bConfirmed643.2500.12820001.522.000
mu Ara cConfirmed9.6390.17220040.09094212.700
mu Ara dConfirmed310.5500.066620040.921189.600
mu Ara eConfirmed4205.8000.098520065.23557.600

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