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HD 36881

HD 36881 Facts

HD 36881's Alternative Names

HIP26215 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD36881.

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+10 818.

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

Location of HD 36881

The location of the giant 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 36881, the location is 05h 35m 13.24 and +10° 14` 24.4 .

Radial Velocity and Proper Motion of HD 36881

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 -5.38 ± 0.37 miliarcseconds/year towards the north and 0.99 ± 0.67 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 32.00 km/s with an error of about 4.30 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 (Colour, Temperature) of HD 36881

HD 36881 has a spectral type of B9IIIMNp.... This means the star is a blue giant star. The star has a B-V Colour Index of 0.14 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,153 Kelvin.

HD 36881 Radius has been calculated as being 15.93 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 11,086,106.85.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 12.20. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HD 36881 Apparent and Absolute Magnitudes

HD 36881 has an apparent magnitude of 5.60 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 -2.66 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.08. 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 36881

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.23 which gave the calculated distance to HD 36881 as 1462.62 light years away from Earth or 448.43 parsecs. It would take a spaceship travelling at the speed of light, 1462.62 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 2.91 which put HD 36881 at a distance of 1120.84 light years or 343.64 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 70,880,344.12 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.

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 36881 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 36881
Alternative NamesHD 36881, HIP 26215, BD+10 818
Spectral TypeB9IIIMNp...
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
ColourBlue
GalaxyMilky Way
ConstellationOrion
Absolute Magnitude -2.66 / -2.08
Visual / Apparent Magnitude5.60
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 35m 13.24
Declination (Dec.)+10° 14` 24.4
Galactic Latitude-11.82 degrees
Galactic Longitude194.79 degrees
1997 Distance from Earth2.23 Parallax (milliarcseconds)
 1462.62 Light Years
 448.43 Parsecs
2007 Distance from Earth2.91 Parallax (milliarcseconds)
 1120.84 Light Years
 343.64 Parsecs
 70,880,344.12 Astronomical Units
Proper Motion Dec.-5.38 ± 0.37 milliarcseconds/year
Proper Motion RA.0.99 ± 0.67 milliarcseconds/year
B-V Index0.14
Radial Velocity32.00 ± 4.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)12.20
Effective Temperature8,153 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
36881+10 818.0A5.60000-12.00000-17.00000B8Blue/White
B9.800001857

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