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HH Delphini

HH Delphini Facts

  • HH Delphini is a pulsating variable star that can be located in the constellation of Delphinus. The description is based on the spectral class.
  • HH Delphini is not part of the constellation outline but is within the borders of the constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -3106.32 light years away from us. Distance

HH Delphini's Alternative Names

HIP100735 is the reference name for the star in the Hipparcos Star Catalogue.

HH Delphini has alternative name(s) :- , HH Del.

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

Location of HH Delphini

The location of the variable 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 HH Delphini, the location is 20h 25m 25.43 and +17° 54` 24.8 .

Physical Properties of HH Delphini

HH Delphini Temperature and Colour

Based on the star's spectral type of N0 The star has a B-V Colour Index of 2.1 which means the star's temperature is about 1,181 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HH Delphini Radius

HH Delphini Apparent and Absolute Magnitudes

HH Delphini has an apparent magnitude of 10.46 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 HH Delphini

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.05000 which gave the calculated distance to HH Delphini as -3106.32 light years away from Earth or -952.38 parsecs. If you want that in miles, it is about -18,260,891,569,227,711.42, based on 1 Ly = 5,878,625,373,183.61 miles.

Variable Type of HH Delphini

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. HH Delphini brightness ranges from a magnitude of 10.750 to a magnitude of 10.412 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 HH Delphini Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHH Delphini
Alternative NamesHIP 100735, HH Del
Spectral TypeN0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
ConstellationDelphinus
Visual / Apparent Magnitude10.46
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)20h 25m 25.43
Declination (Dec.)+17° 54` 24.8
Galactic Latitude-11.38734287 degrees
Galactic Longitude60.03578898 degrees
Distance from Earth-1.05000 Parallax (milliarcseconds)
 -3106.32 Light Years
 -952.38 Parsecs
 -196,441,107.35 Astronomical Units
B-V Index2.1
Radial Velocity51.00000 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.271
Variable Magnitude Range (Brighter - Dimmer)10.412 - 10.750

Estimated Calculated Facts


Effective Temperature1,181 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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