Universe Guide

HO Lyrae

HO Lyrae Facts

  • HO Lyrae is a pulsating variable star that can be located in the constellation of Lyra. The description is based on the spectral class.
  • HO Lyrae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2e) of the star, the star's colour is red .
  • 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 2296.92 light years away from us. Distance

HO Lyrae's Alternative Names

HIP95032 is the reference name for the star in the Hipparcos Star Catalogue.

HO Lyrae has alternative name(s) :- HO Lyr, HO Lyr.

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

Location of HO Lyrae

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 HO Lyrae, the location is 19h 20m 08.76 and +41° 40` 59.2 .

Proper Motion of HO Lyrae

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 -7.41 ± 3.44 milliarcseconds/year towards the north and -15.39 ± 3.95 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 HO Lyrae

HO Lyrae Temperature and Colour

Based on the star's spectral type of M2e , HO Lyrae's colour and type is red variable star. The star has a B-V Colour Index of 1.5 which means the star's temperature is about 4,014 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HO Lyrae Radius

HO Lyrae estimated radius has been calculated as being 1.43 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 995,812.62.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 7.3068123561026612302523954088. 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.

HO Lyrae Apparent and Absolute Magnitudes

HO Lyrae has an apparent magnitude of 11.35 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 5.65 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.11. 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 HO Lyrae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.24000 which gave the calculated distance to HO Lyrae as 450.50 light years away from Earth or 138.12 parsecs. If you want that in miles, it is about 2,648,320,730,619,216.31, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.42000 which put HO Lyrae at a distance of 2296.92 light years or 704.23 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 145,256,852.34 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.

Travel Time to HO Lyrae

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 A3807362,092,870,580.82
Speed of Sound (Mach 1)767.2692,007,578,499.17
Concorde (Mach 2)1,534.541,003,787,941.33
New Horizons Probe33,00046,677,355.98
Speed of Light670,616,629.002,296.92

Variable Type of HO Lyrae

The star is a pulsating Omicron Ceti 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. HO Lyrae brightness ranges from a magnitude of 13.225 to a magnitude of 10.809 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 100.3 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 HO Lyrae Facts and Figures

Visual Facts

Primary / Proper / Traditional NameHO Lyrae
Alternative NamesHO Lyr, HIP 95032, HO Lyr
Spectral TypeM2e
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Absolute Magnitude 5.65 / 2.11
Visual / Apparent Magnitude11.35
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)19h 20m 08.76
Declination (Dec.)+41° 40` 59.2
Galactic Latitude12.72035292 degrees
Galactic Longitude73.50061287 degrees
1997 Distance from Earth7.24000 Parallax (milliarcseconds)
 450.50 Light Years
 138.12 Parsecs
2007 Distance from Earth1.42000 Parallax (milliarcseconds)
 2296.92 Light Years
 704.23 Parsecs
 145,256,852.34 Astronomical Units
Proper Motion Dec.-7.41000 ± 3.44000 milliarcseconds/year
Proper Motion RA.-15.39000 ± 3.95000 milliarcseconds/year
B-V Index1.5

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days100.300
Variable Magnitude Range (Brighter - Dimmer)10.809 - 13.225

Estimated Calculated Facts

Radius (x the Sun)7.31
Effective Temperature4,014 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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