Universe Guide

89 Herculis

89 Herculis Facts

  • 89 Herculis is a pulsating supergiant star that can be located in the constellation of Hercules. The description is based on the spectral class.
  • 89 Herculis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F2Iavar) 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 4291.62 light years away from us. Distance

89 Herculis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR6685. HIP87747 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD163506.

89 Herculis has alternative name(s) :- V441 Her, V441 Her.

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 89 Herculis. The Flamsteed name can be shortened to 89 Her.

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+26 3120.

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

Location of 89 Herculis

The location of the supergiant 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 89 Herculis, the location is 17h 55m 25.19 and +26° 02` 59.9 .

Radial Velocity and Proper Motion of 89 Herculis

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 5.89 ± 0.15 milliarcseconds/year towards the north and 4.34 ± 0.23 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 -27.80000 km/s with an error of about 10.00 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 89 Herculis

89 Herculis Temperature and Colour

Based on the star's spectral type of F2Iavar , 89 Herculis's colour and type is yellow to white supergiant star. The star has a B-V Colour Index of 0.34 which means the star's temperature is about 6,614 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

89 Herculis Radius

89 Herculis estimated radius has been calculated as being 56.24 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 39,129,430.74.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 75.513637119457706501184990634. 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.

89 Herculis Iron Abundance

89 Herculis Iron Abundance is 0.01 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.

89 Herculis Apparent and Absolute Magnitudes

89 Herculis has an apparent magnitude of 5.47 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 -4.49 If you used the 2007 Parallax value, you would get an absolute magnitude of -5.13. 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 89 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.02000 which gave the calculated distance to 89 Herculis as 3197.68 light years away from Earth or 980.39 parsecs. If you want that in miles, it is about 18,797,962,783,321,766.02, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.76000 which put 89 Herculis at a distance of 4291.62 light years or 1315.79 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 271,399,278.28 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.

Travel Time to 89 Herculis

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)
Airbus A3807363,910,369,208.35
Speed of Sound (Mach 1)767.2693,751,007,452.86
Concorde (Mach 2)1,534.541,875,501,282.04
New Horizons Probe33,00087,213,082.95
Speed of Light670,616,629.004,291.62

Variable Type of 89 Herculis

The star is a pulsating Semi-Regular Star w 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. 89 Herculis brightness ranges from a magnitude of 5.623 to a magnitude of 5.472 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 63.8 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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Additional 89 Herculis Facts and Figures

Visual Facts

Primary / Proper / Traditional Name89 Herculis
Alternative NamesV441 Her, HD 163506, HIP 87747, HR 6685, 89 Her, BD+26 3120, V441 Her
Spectral TypeF2Iavar
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
ColourYellow - White
GalaxyMilky Way
Absolute Magnitude -4.49 / -5.13
Visual / Apparent Magnitude5.47
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 55m 25.19
Declination (Dec.)+26° 02` 59.9
Galactic Latitude23.18765012 degrees
Galactic Longitude51.43404983 degrees
1997 Distance from Earth1.02000 Parallax (milliarcseconds)
 3197.68 Light Years
 980.39 Parsecs
2007 Distance from Earth0.76000 Parallax (milliarcseconds)
 4291.62 Light Years
 1315.79 Parsecs
 271,399,278.28 Astronomical Units
Proper Motion Dec.5.89000 ± 0.15000 milliarcseconds/year
Proper Motion RA.4.34000 ± 0.23000 milliarcseconds/year
B-V Index0.34
Radial Velocity-27.80000 ± 10.00 km/s
Iron Abundance0.0100 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days63.810
Variable Magnitude Range (Brighter - Dimmer)5.472 - 5.623

Estimated Calculated Facts

Radius (x the Sun)75.51
Effective Temperature6,614 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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