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HD 257498

HD 257498 Facts

  • HD 257498 is a star that can be located in the constellation of Gemini. The description is based on the spectral class.
  • HD 257498 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G0) of the star, the star's colour is yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 58.75 light years away from us. Distance

HD 257498's Alternative Names

HIP30756 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD257498.

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+20 1426.

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

Location of HD 257498

The location of the 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 257498, the location is 06h 27m 45.94 and +20° 46` 59.6 .

Physical Properties of HD 257498

HD 257498 Temperature and Colour

Based on the star's spectral type of G0 , HD 257498's colour and type is yellow star. The star has a B-V Colour Index of 1.02 which means the star's temperature is about 4,929 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 257498 Radius

HD 257498 estimated radius has been calculated as being 0.44 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 307,466.94.km. If you need the diameter of the star, you just need to multiple the radius by 2. 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 257498 Apparent and Absolute Magnitudes

HD 257498 has an apparent magnitude of 8.59 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 7.31 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 257498

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 55.52000 which gave the calculated distance to HD 257498 as 58.75 light years away from Earth or 18.01 parsecs. If you want that in miles, it is about 345,369,240,674,537.09, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to HD 257498

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)
Walking49,849,681,738.44
Car120328,322,724.61
Airbus A380 73653,530,879.01
Speed of Sound (Mach 1)767.26951,349,301.16
Concorde (Mach 2)1,534.5425,674,617.12
New Horizons Probe33,0001,193,900.82
Speed of Light670,616,629.0058.75

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 257498 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 257498
Alternative NamesHD 257498, HIP 30756, BD+20 1426
Spectral TypeG0
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeStar
ColourYellow
GalaxyMilky Way
ConstellationGemini
Absolute Magnitude 7.31
Visual / Apparent Magnitude8.59
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 27m 45.94
Declination (Dec.)+20° 46` 59.6
Galactic Latitude4.35904616 degrees
Galactic Longitude191.78280498 degrees
Distance from Earth55.52000 Parallax (milliarcseconds)
 58.75 Light Years
 18.01 Parsecs
 3,714,803.28 Astronomical Units
B-V Index1.02

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)0.44
Effective Temperature4,929 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
257498+20 1426.0B8.00000-12.00000-18.00000G0Yellow1957
C12.400001911
D12.500001985
E12.000001985
F13.000001985

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