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HD 47415

HD 47415 Facts

  • HD 47415 is a subgiant star that can be located in the constellation of Gemini. The description is based on the spectral class.
  • HD 47415 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F8IV) of the star, the star's colour is yellow to white .
  • 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 4.10 Billion of Years but could be as young as 3.60 to 4.50 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 106.90 light years away from us. Distance

HD 47415's Alternative Names

HIP31850 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD47415.

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+24 1343.

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

Location of HD 47415

The location of the subgiant 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 HD 47415, the location is 06h 39m 31.47 and +24° 35` 59.8 .

Radial Velocity and Proper Motion of HD 47415

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 90.26 ± 0.33 milliarcseconds/year towards the north and 17.48 ± 0.60 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 5.90000 km/s with an error of about 0.20 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 HD 47415

HD 47415 Temperature and Colour

Based on the star's spectral type of F8IV , HD 47415's colour and type is yellow to white subgiant star. The star has a B-V Colour Index of 0.52 which means the star's temperature is about 6,202 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 47415 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 2.51 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

HD 47415 Radius

HD 47415 estimated radius has been calculated as being 1.47 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,023,971.76.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 1.3734159430151383816022325299. 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.

HD 47415 Iron Abundance

HD 47415 Iron Abundance is -0.21 with an error value of 0.08 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

HD 47415 Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 4.10 Billion years old but could be between 3.60 and 4.50 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 47415 Apparent and Absolute Magnitudes

HD 47415 has an apparent magnitude of 6.43 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 3.70 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.85. 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 HD 47415

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 28.44000 which gave the calculated distance to HD 47415 as 114.68 light years away from Earth or 35.16 parsecs. If you want that in miles, it is about 674,160,757,796,696.39, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 30.51000 which put HD 47415 at a distance of 106.90 light years or 32.78 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 6,761,313.24 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 7,432.00 Parsecs or 24,240.46 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 HD 47415

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)
Walking417,922,229,410.03
Car120597,407,647.00
Airbus A38073697,403,420.71
Speed of Sound (Mach 1)767.26993,433,877.35
Concorde (Mach 2)1,534.5446,716,877.79
New Horizons Probe33,0002,172,391.44
Speed of Light670,616,629.00106.90

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 HD 47415 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 47415
Alternative NamesHD 47415, HIP 31850, BD+24 1343
Spectral TypeF8IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
ColourYellow - White
GalaxyMilky Way
ConstellationGemini
Age4.10 Billion Years Old
Age Range3.60 - 4.50 Billion Years Old
Absolute Magnitude 3.70 / 3.85
Visual / Apparent Magnitude6.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 39m 31.47
Declination (Dec.)+24° 35` 59.8
Galactic Latitude8.49779939 degrees
Galactic Longitude189.57999660 degrees
1997 Distance from Earth28.44000 Parallax (milliarcseconds)
 114.68 Light Years
 35.16 Parsecs
2007 Distance from Earth30.51000 Parallax (milliarcseconds)
 106.90 Light Years
 32.78 Parsecs
 6,761,313.24 Astronomical Units
Galacto-Centric Distance24,240.46 Light Years / 7,432.00 Parsecs
Proper Motion Dec.90.26000 ± 0.33000 milliarcseconds/year
Proper Motion RA.17.48000 ± 0.60000 milliarcseconds/year
B-V Index0.52
Radial Velocity5.90000 ± 0.20 km/s
Iron Abundance-0.2100 ± 0.08 Fe/H
Eccentricity0.26860
Semi-Major Axis9763.0000000
Stellar Luminosity (Lsun)2.5100000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)1.37
Effective Temperature6,202 Kelvin

Sources and Links


SIMBAD SourceLink

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