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HD 173637

HD 173637 Facts

HD 173637's Alternative Names

HIP92128 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD173637.

HD 173637 has alternative name(s) :- , V455 Sct.

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-08 4702.

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

Location of HD 173637

The location of the subgiant 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 173637, the location is 18h 46m 38.08 and -07 ° 55` 55.1 .

Physical Properties (Colour, Temperature) of HD 173637

HD 173637 Colour and Temperature

HD 173637 has a spectral type of B1IV. This means the star is a blue subgiant star. The star has a B-V Colour Index of 0.23 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,593 Kelvin.

HD 173637 Apparent and Absolute Magnitudes

HD 173637 has an apparent magnitude of 9.16 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 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 173637

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.00 which gave the calculated distance to HD 173637 as -3261.63 light years away from Earth or -1000 parsecs. It would take a spaceship travelling at the speed of light, -3261.63 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of HD 173637

The star is a eruptive Gamma Cassiopeiae 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. HD 173637 brightness ranges from a magnitude of 9.322 to a magnitude of 9.001 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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 HD 173637 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 173637
Alternative NamesHD 173637, HIP 92128, BD-08 4702, V455 Sct
Spectral TypeB1IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
ColourBlue
GalaxyMilky Way
ConstellationScutum
Visual / Apparent Magnitude9.16
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 46m 38.08
Declination (Dec.)-07 ° 55` 55.1
Galactic Latitude-2.55 degrees
Galactic Longitude25.32 degrees
Distance from Earth-1.00 Parallax (milliarcseconds)
 -3261.63 Light Years
 -1000 Parsecs
 -206,263,368.98 Astronomical Units
B-V Index0.23
Radial Velocity-46.00 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days0.303
Variable Magnitude Range (Brighter - Dimmer)9.001 - 9.322

Estimated Calculated Facts


Effective Temperature7,593 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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