Universe Guide

41 Arae

41 Arae Facts

  • 41 Arae is a main sequence star that can be located in the constellation of Ara. The description is based on the spectral class.
  • 41 Arae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M0V) of the star, the star's colour is red .
  • 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 28.71 light years away from us. Distance

41 Arae's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR6416. HIP84720 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD156274. The Gliese ID of the star is GL 666A. 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 41 Arae. The Flamsteed name can be shortened to 41 Ara.

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

Location of 41 Arae

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 41 Arae, the location is 17h 19m 02.95 and -46° 38` 11.4 .

Radial Velocity and Proper Motion of 41 Arae

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 108.99 ± 0.31 milliarcseconds/year towards the north and 1,037.56 ± 0.69 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 25.70000 km/s with an error of about 0.66 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 41 Arae

41 Arae Colour and Temperature

Based on the star's spectral type of M0V , 41 Arae's colour and type is red main sequence star. The star has a B-V Colour Index of 0.76 which means the star's temperature is about 5,391 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

41 Arae 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 0.50 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

41 Arae Radius

41 Arae estimated radius has been calculated as being 0.76 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 527,221.02.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 0.7577191987334997627813617265. 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.

41 Arae Iron Abundance

41 Arae Iron Abundance is -0.33 with an error value of 0.02 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

41 Arae Apparent and Absolute Magnitudes

41 Arae has an apparent magnitude of 5.47 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 5.75 If you used the 2007 Parallax value, you would get an absolute magnitude of 5.75. 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 41 Arae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 113.81000 which gave the calculated distance to 41 Arae as 28.66 light years away from Earth or 8.79 parsecs. If you want that in miles, it is about 168,481,403,195,442.26, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 113.61000 which put 41 Arae at a distance of 28.71 light years or 8.80 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 1,815,117.65 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 7,392.00 Parsecs or 24,109.99 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 41 Arae

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 A38073626,159,515.51
Speed of Sound (Mach 1)767.26925,093,420.19
Concorde (Mach 2)1,534.5412,546,693.74
New Horizons Probe33,000583,436.47
Speed of Light670,616,629.0028.71
41 Arae brightness ranges from a magnitude of 5.630 to a magnitude of 5.590 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 days (variability).

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.

Hide Explanations
Show GridLines

Additional 41 Arae Facts and Figures

Visual Facts

Primary / Proper / Traditional Name41 Arae
Alternative NamesHD 156274, HIP 84720, HR 6416, 41 Ara, Gliese 666A
Spectral TypeM0V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Absolute Magnitude 5.75 / 5.75
Visual / Apparent Magnitude5.47
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 19m 02.95
Declination (Dec.)-46° 38` 11.4
Galactic Latitude-5.26608545 degrees
Galactic Longitude342.29721812 degrees
1997 Distance from Earth113.81000 Parallax (milliarcseconds)
 28.66 Light Years
 8.79 Parsecs
2007 Distance from Earth113.61000 Parallax (milliarcseconds)
 28.71 Light Years
 8.80 Parsecs
 1,815,117.65 Astronomical Units
Galacto-Centric Distance 24,109.99 Light Years / 7,392.00 Parsecs
Proper Motion Dec.108.99000 ± 0.31000 milliarcseconds/year
Proper Motion RA.1037.56000 ± 0.69000 milliarcseconds/year
B-V Index0.76
Radial Velocity25.70000 ± 0.66 km/s
Iron Abundance-0.3300 ± 0.02 Fe/H
Semi-Major Axis11607.0000000
Stellar Luminosity (Lsun)0.5000000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.034
Variable Magnitude Range (Brighter - Dimmer)5.590 - 5.630

Estimated Calculated Facts

Radius (x the Sun)0.76
Effective Temperature5,391 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

Related Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine