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NO Aurigae, HD37536, HIP26718

NO Aurigae is a red pulsating supergiant star that can be located in the constellation of Auriga. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

NO Aurigae's Alternative Names

HIP26718 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD37536.

NO Aurigae has alternative name(s) :- , NO Aur.

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+31 1049.

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

Location of NO Aurigae

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 star is compared to the celestial equator and is expressed in degrees. For NO Aurigae, the location is 05h 40m 42.05 and +31° 55` 14.2 .

Proper Motion of NO Aurigae

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 -3.65 ± 0.25 miliarcseconds/year towards the north and 0.13 ± 0.47 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 us is 7.21000 km/s with an error of about 0.45 km/s .

Physical Properties (Colour, Temperature) of NO Aurigae

NO Aurigae has a spectral type of M2SIab. This means the star is a red supergiant star. The star has a B-V Colour Index of 2.08 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 1,306 Kelvin.

NO Aurigae Radius has been calculated as being 435.55 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 303,054,007.58.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 615.24. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.15 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

NO Aurigae Apparent and Absolute Magnitudes

NO Aurigae has an apparent magnitude of 6.23 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 -1.89 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.64. 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 NO Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.38 which gave the calculated distance to NO Aurigae as 1370.43 light years away from Earth or 420.17 parsecs. It would take a spaceship travelling at the speed of light, 1370.43 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 1.68 which put NO Aurigae at a distance of 1941.45 light years or 595.24 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.

Variable Type of NO Aurigae

The star is a pulsating Slow Irregular variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. NO Aurigae brightness ranges from a magnitude of 6.296 to a magnitude of 6.126 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 days (variability).

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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NO Aurigae Facts

Visual Facts


 NO Aurigae
Alternative NamesHD 37536, HIP 26718, BD+31 1049, NO Aur
Spectral TypeM2SIab
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour red
GalaxyMilky Way
ConstellationAuriga
Absolute Magnitude-1.89 / -2.64
Visual / Apparent Magnitude6.23
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 40m 42.05
Declination (Dec.)+31° 55` 14.2
Galactic Latitude0.67 degrees
Galactic Longitude176.90 degrees
1997 Distance from Earth2.38 Parallax (milliarcseconds)
 1370.43 Light Years
 420.17 Parsecs
2007 Distance from Earth1.68 Parallax (milliarcseconds)
 1941.45 Light Years
 595.24 Parsecs
Proper Motion Dec.-3.65 ± 0.25 milliarcseconds/year
Proper Motion RA.0.13 ± 0.47 milliarcseconds/year
B-V Index2.08
Radial Velocity7.21 ± 0.45 km/s
Iron Abundance-0.15 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.164
Variable Magnitude Range (Brighter - Dimmer)6.126 - 6.296

Estimated Facts


Calculated Effective Temperature1,306 Kelvin

Sources and Links


SIMBAD SourceLink

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