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AD Horolgii

AD Horolgii Facts

  • AD Horolgii is a pulsating subgiant star that can be located in the constellation of Horologium. The description is based on the spectral class.
  • AD Horolgii is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A2IV) of the star, the star's colour is blue - white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 665.64 light years away from us. Distance

AD Horolgii's Alternative Names

HIP16772 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD22541.

AD Horolgii has alternative name(s) :- AD Hor, AD Hor.

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

Location of AD Horolgii

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 AD Horolgii, the location is 03h 35m 49.80 and -43° 42` 59.1 .

Proper Motion of AD Horolgii

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 17.10 ± 0.34 milliarcseconds/year towards the north and 15.97 ± 0.40 milliarcseconds/year east if we saw them in the horizon. . 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 AD Horolgii

AD Horolgii Temperature and Colour

Based on the star's spectral type of A2IV , AD Horolgii's colour and type is blue - white subgiant star. The star has a B-V Colour Index of 0.15 which means the star's temperature is about 8,084 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AD Horolgii 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 53.34 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

AD Horolgii Radius

AD Horolgii estimated radius has been calculated as being 4.07 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,832,251.94.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 3.8339476791374094136356501473. 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.

AD Horolgii Apparent and Absolute Magnitudes

AD Horolgii has an apparent magnitude of 7.02 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 0.34 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.47. 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 AD Horolgii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.62000 which gave the calculated distance to AD Horolgii as 705.98 light years away from Earth or 216.45 parsecs. If you want that in miles, it is about 4,150,191,940,960,164.99, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 4.90000 which put AD Horolgii at a distance of 665.64 light years or 204.08 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 42,094,228.34 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 7,443.00 Parsecs or 24,276.34 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 AD Horolgii

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)
Walking4111,597,313,231.89
Car1203,719,910,441.06
Airbus A380736606,507,137.13
Speed of Sound (Mach 1)767.269581,789,767.25
Concorde (Mach 2)1,534.54290,894,504.49
New Horizons Probe33,00013,526,947.06
Speed of Light670,616,629.00665.64

Variable Type of AD Horolgii

The star is a pulsating Delta Scuti 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. AD Horolgii brightness ranges from a magnitude of 7.112 to a magnitude of 7.034 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 AD Horolgii Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAD Horolgii
Alternative NamesAD Hor, HD 22541, HIP 16772, AD Hor
Spectral TypeA2IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
ColourBlue
GalaxyMilky Way
ConstellationHorologium
Absolute Magnitude 0.34 / 0.47
Visual / Apparent Magnitude7.02
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)03h 35m 49.80
Declination (Dec.)-43° 42` 59.1
Galactic Latitude-53.11810027 degrees
Galactic Longitude250.59365934 degrees
1997 Distance from Earth4.62000 Parallax (milliarcseconds)
 705.98 Light Years
 216.45 Parsecs
2007 Distance from Earth4.90000 Parallax (milliarcseconds)
 665.64 Light Years
 204.08 Parsecs
 42,094,228.34 Astronomical Units
Galacto-Centric Distance24,276.34 Light Years / 7,443.00 Parsecs
Proper Motion Dec.17.10000 ± 0.34000 milliarcseconds/year
Proper Motion RA.15.97000 ± 0.40000 milliarcseconds/year
B-V Index0.15
Stellar Luminosity (Lsun)53.3400000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Scuti
Mean Variability Period in Days0.091
Variable Magnitude Range (Brighter - Dimmer)7.034 - 7.112

Estimated Calculated Facts


Radius (x the Sun)3.83
Effective Temperature8,084 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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