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Nu Persei (41 Persei) Star Facts

Nu Persei Facts

  • Nu Persei is a luminous giant star that can be located in the constellation of Perseus. The description is based on the spectral class.
  • Nu Persei is a main star of the constellation outline.
  • Based on the spectral type (F5IIvar) 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 is calculated at being about 556.59 light years away from us. Distance

Nu Persei's Alternative Names

Nu Persei (Nu. Per) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR1135. HIP17529 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD23230.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 41 Persei. The Flamsteed name can be shortened to 41 Per.

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+42 815.

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

Location of Nu Persei

The location of the luminous 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 Nu Persei, the location is 03h 45m 11.64 and +42° 34` 42.8 .

Radial Velocity and Proper Motion of Nu Persei

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 2.53 ± 0.13 milliarcseconds/year towards the north and -14.45 ± 0.22 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 -12.10000 km/s with an error of about 0.60 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 Nu Persei

Nu Persei Temperature and Colour

Based on the star's spectral type of F5IIvar , Nu Persei's colour and type is yellow to white luminous giant star. The star has a B-V Colour Index of 0.42 which means the star's temperature is about 6,335 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Nu Persei 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 759.87 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Nu Persei Radius

Nu Persei estimated radius has been calculated as being 23.30 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 16,215,041.17.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.

Nu Persei Iron Abundance

Nu Persei Iron Abundance is 0.04 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

Nu Persei Apparent and Absolute Magnitudes

Nu Persei has an apparent magnitude of 3.77 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 -2.39 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 Nu Persei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.86000 which gave the calculated distance to Nu Persei as 556.59 light years away from Earth or 170.65 parsecs. If you want that in miles, it is about 3,271,984,096,460,265.49, based on 1 Ly = 5,878,625,373,183.61 miles.

The star's Galacto-Centric Distance is 7,551.00 Parsecs or 24,628.59 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 Nu Persei

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)
Walking493,314,627,383.78
Car1203,110,487,579.46
Airbus A380736507,144,714.04
Speed of Sound (Mach 1)767.269486,476,723.98
Concorde (Mach 2)1,534.54243,238,044.97
New Horizons Probe33,00011,310,863.93
Speed of Light670,616,629.00556.59

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 Nu Persei Facts and Figures

Visual Facts


Primary / Proper / Traditional NameNu Persei
Alternative NamesNu. Per, HD 23230, HIP 17529, HR 1135, 41 Persei, 41 Per, BD+42 815
Spectral TypeF5IIvar
Constellation's Main StarYes
Multiple Star SystemYes
Star TypeLuminous Giant Star
ColourYellow - White
GalaxyMilky Way
ConstellationPerseus
Absolute Magnitude -2.39
Visual / Apparent Magnitude3.77
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 45m 11.64
Declination (Dec.)+42° 34` 42.8
Galactic Latitude-9.63262307 degrees
Galactic Longitude153.83197533 degrees
Distance from Earth5.86000 Parallax (milliarcseconds)
 556.59 Light Years
 170.65 Parsecs
 35,198,843.92 Astronomical Units
Galacto-Centric Distance24,628.59 Light Years / 7,551.00 Parsecs
Proper Motion Dec.2.53000 ± 0.13000 milliarcseconds/year
Proper Motion RA.-14.45000 ± 0.22000 milliarcseconds/year
B-V Index0.42
Radial Velocity-12.10000 ± 0.60 km/s
Iron Abundance0.0400 ± 9.99 Fe/H
Eccentricity0.26320
Semi-Major Axis9524.0000000
Stellar Luminosity (Lsun)759.8700000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)23.30
Effective Temperature6,335 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
23230+42 815.0A3.90000-13.000000.00000F5Yellow/White
B11.900001916

Perseus Main Stars


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