Universe Guide
SearchTwitter Comments

Ross 154

Ross 154 Facts

Ross 154's Alternative Names

HIP92403 is the reference name for the star in the Hipparcos Star Catalogue. The Gliese ID of the star is GL 729. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names


Location of Ross 154


Radial Velocity and Proper Motion of Ross 154

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 -191.64 ± 1.02 milliarcseconds/year towards the north and 637.02 ± 2.03 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity


Physical Properties (Colour, Temperature) of Ross 154

Ross 154 Colour and Temperature

Ross 154 has a spectral type of M3.5Ve. This means the star is a red main sequence star. The star has a B-V Colour Index of 1.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,971 Kelvin.

Ross 154 Radius

Radius has been calculated as being 0.05 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 34,313.13.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 0.05. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Ross 154 Apparent and Absolute Magnitudes

Ross 154 has an apparent magnitude of 10.37 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 13.01 If you used the 2007 Parallax value, you would get an absolute magnitude of 13.01. 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 Ross 154

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 336.48 which gave the calculated distance to Ross 154 as 9.69 light years away from Earth or 2.97 parsecs. If you want that in miles, it is 56,963,879,866,149.08.

In 2007, Hipparcos data was revised with a new parallax of 336.72 which put Ross 154 at a distance of 9.69 light years or 2.97 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 612,602.21 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.


Time to Travel to Ross 154


If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 474,698,998,884.58 hours or 54,189,383.43 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to Ross 154 then it would take 1,726,178,177.76 hours / 197,052.30 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 9.69 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Source of Information


Hide Explanations
Show GridLines

Additional Ross 154 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameRoss 154
Alternative NamesHIP 92403, Gliese 729
Spectral TypeM3.5Ve
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Absolute Magnitude 13.01 / 13.01
Visual / Apparent Magnitude10.37
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)18h 49m 48.96
Declination (Dec.)-23° 50` 08.8
Galactic Latitude-10.28 degrees
Galactic Longitude11.31 degrees
1997 Distance from Earth336.48 Parallax (milliarcseconds)
 9.69 Light Years
 2.97 Parsecs
2007 Distance from Earth336.72 Parallax (milliarcseconds)
 9.69 Light Years
 2.97 Parsecs
 612,602.21 Astronomical Units
Galacto-Centric Distance24,126.30 Light Years / 7,397.00 Parsecs
Proper Motion Dec.-191.64 ± 1.02 milliarcseconds/year
Proper Motion RA.637.02 ± 2.03 milliarcseconds/year
B-V Index1.51
Radial Velocity-10.50 ± 0.10 km/s
Semi-Major Axis8459.00

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)0.05
Effective Temperature3,971 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions



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