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HD 51823

HD 51823 Facts

  • HD 51823 is a main sequence star that can be located in the constellation of Canis Major. The description is based on the spectral class.
  • HD 51823 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B2/B3V) of the star, the star's colour is blue .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • The star is calculated at being about 1019.26 light years away from us. Distance

HD 51823's Alternative Names

HIP33492 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD51823.

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

Location of HD 51823

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 HD 51823, the location is 06h 57m 42.64 and -27° 32` 15.1 .

Radial Velocity and Proper Motion of HD 51823

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 6.71 ± 0.39 milliarcseconds/year towards the north and -8.44 ± 0.59 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 24.00000 km/s with an error of about 11.00 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 HD 51823

HD 51823 Temperature and Colour

Based on the star's spectral type of B2/B3V , HD 51823's colour and type is blue main sequence star. The star has a B-V Colour Index of -0.14 which means the star's temperature is about 13,196 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 51823 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 637.05 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

HD 51823 Radius

HD 51823 estimated radius has been calculated as being 3.18 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,210,627.09.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 51823 Apparent and Absolute Magnitudes

HD 51823 has an apparent magnitude of 6.22 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 -1.25 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 51823

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.20000 which gave the calculated distance to HD 51823 as 1019.26 light years away from Earth or 312.5 parsecs. If you want that in miles, it is about 5,991,847,697,871,126.33, based on 1 Ly = 5,878,625,373,183.61 miles.

The star's Galacto-Centric Distance is 7,559.00 Parsecs or 24,654.69 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 51823

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)
Walking4170,883,176,318.64
Car1205,696,105,877.29
Airbus A380736928,712,914.78
Speed of Sound (Mach 1)767.269890,864,488.56
Concorde (Mach 2)1,534.54445,431,663.74
New Horizons Probe33,00020,713,112.28
Speed of Light670,616,629.001,019.26

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 51823 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 51823
Alternative NamesHD 51823, HIP 33492
Spectral TypeB2/B3V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationCanis Major
Absolute Magnitude -1.25
Visual / Apparent Magnitude6.22
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 57m 42.64
Declination (Dec.)-27° 32` 15.1
Galactic Latitude-10.90716778 degrees
Galactic Longitude238.41890332 degrees
Distance from Earth3.20000 Parallax (milliarcseconds)
 1019.26 Light Years
 312.5 Parsecs
 64,457,302.81 Astronomical Units
Galacto-Centric Distance24,654.69 Light Years / 7,559.00 Parsecs
Proper Motion Dec.6.71000 ± 0.39000 milliarcseconds/year
Proper Motion RA.-8.44000 ± 0.59000 milliarcseconds/year
B-V Index-0.14
Radial Velocity24.00000 ± 11.00 km/s
Eccentricity0.05130
Semi-Major Axis7947.0000000
Stellar Luminosity (Lsun)637.0500000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)3.18
Effective Temperature13,196 Kelvin

Sources and Links


SIMBAD SourceLink

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