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Fulu, Zeta Cassiopeiae, 17 Cassiopeiae, HD3360, HIP2920, HR153

Primary Facts on Fulu

  • Fulu's star type is subgiant star that can be located in the constellation of Cassiopeia. The description is based on the spectral class.
  • Fulu is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B2IV) of the star, the star's colour is blue .
  • Zeta Cassiopeiae is the Bayer name for the star. It was assigned this name by Johann Bayer in 1603. The closer to the start of the Greek Alphabet the name, the brighter the star is. Alpha stars tend to be the brightest in the constellation. A notable exception is Pollux (Beta Geminorum) which is the brighest star in the Gemini constellation.
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 593.02 light years away from us.

Fulu's Alternative Names

Zeta Cassiopeiae (Zet Cas) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR153. HIP2920 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD3360.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 17 Cassiopeiae with it shortened to 17 Cas.

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+53 105.

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

Location of Fulu

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 Fulu, the location is 00h 36m 58.27 and +53° 53` 49.0 .

Radial Velocity and Proper Motion of Fulu

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 -9.86 ± 0.10 miliarcseconds/year towards the north and 17.38 ± 0.16 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 -0.20 km/s with an error of about 0.10 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.

Fulu 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 3,840.55 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Fulu

Fulu has a spectral type of B2IV. This means the star is a blue subgiant star. The star is 7,494.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,442.68 s. The star has a B-V Colour Index of -0.1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,677 Kelvin.

Fulu Radius has been calculated as being 7.63 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,305,801.42.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 7.59. 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 -0.08 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Fulu Apparent and Absolute Magnitudes

Fulu has an apparent magnitude of 3.69 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 -2.62 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.61. 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 Fulu

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.46 which gave the calculated distance to Fulu as 597.37 light years away from Earth or 183.15 parsecs. It would take a spaceship travelling at the speed of light, 597.37 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 5.50 which put Fulu at a distance of 593.02 light years or 181.82 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 37,502,805.75 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.

The star's Galacto-Centric Distance is 7,494.00 Parsecs or 24,442.68 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 Fulu Facts and Figures

Visual Facts


Primary / Proper / Traditional NameFulu
Alternative NamesZeta Cassiopeiae, Zet Cas, HD 3360, HIP 2920, HR 153, 17 Cassiopeiae, 17 Cas, BD+53 105
Spectral TypeB2IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour blue
GalaxyMilky Way
ConstellationCassiopeia
Absolute Magnitude -2.62 / -2.61
Visual / Apparent Magnitude3.69
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)00h 36m 58.27
Declination (Dec.)+53° 53` 49.0
Galactic Latitude-8.91 degrees
Galactic Longitude120.78 degrees
1997 Distance from Earth5.46 Parallax (milliarcseconds)
 597.37 Light Years
 183.15 Parsecs
2007 Distance from Earth5.50 Parallax (milliarcseconds)
 593.02 Light Years
 181.82 Parsecs
 37,502,805.75 Astronomical Units
Galacto-Centric Distance24,442.68 Light Years / 7,494.00 Parsecs
Proper Motion Dec.-9.86 ± 0.10 milliarcseconds/year
Proper Motion RA. 17.38 ± 0.16 milliarcseconds/year
B-V Index-0.10
Radial Velocity-0.20 ± 0.10 km/s
Iron Abundance-0.08 ± 9.99 Fe/H
Eccentricity0.07
Semi-Major Axis8033.00
Stellar Luminosity (Lsun)3,840.55

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature11,677 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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