Universe Guide

AP Arietis

AP Arietis Facts

AP Arietis's Alternative Names

HIP13801 is the reference name for the star in the Hipparcos Star Catalogue.

AP Arietis has alternative name(s) :- , AP Ari.

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+23 390.

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

Location of AP Arietis

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 AP Arietis, the location is 02h 57m 42.78 and +23° 57` 45.4 .

Proper Motion of AP Arietis

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 -92.88 ± 0.81 milliarcseconds/year towards the north and -26.28 ± 1.39 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.

AP Arietis 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 0.49 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of AP Arietis

AP Arietis Colour and Temperature

AP Arietis has a spectral type of K0. This means the star is a orange to red variable star. The star has a B-V Colour Index of 0.77 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,490 Kelvin.

AP Arietis Radius

Radius has been calculated as being 0.66 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 461,513.73.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 0.73. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

AP Arietis Apparent and Absolute Magnitudes

AP Arietis has an apparent magnitude of 9.87 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 5.96 If you used the 2007 Parallax value, you would get an absolute magnitude of 5.76. 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 AP Arietis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.51 which gave the calculated distance to AP Arietis as 197.56 light years away from Earth or 60.57 parsecs. If you want that in miles, it is 1,272,310,889,518,126.55.

In 2007, Hipparcos data was revised with a new parallax of 15.07 which put AP Arietis at a distance of 216.43 light years or 66.36 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 13,687,637.17 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 7,452.00 Parsecs or 24,305.69 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Time to Travel to AP Arietis

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 9,678,176,906,051.27 hours or 1,104,814,715.30 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to AP Arietis then it would take 35,193,370,567.46 hours / 4,017,508.06 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 197.56 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

AP Arietis brightness ranges from a magnitude of 10.065 to a magnitude of 9.905 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 AP Arietis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameAP Arietis
Alternative NamesHIP 13801, BD+23 390, AP Ari
Spectral TypeK0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude 5.96 / 5.76
Visual / Apparent Magnitude9.87
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 57m 42.78
Declination (Dec.)+23° 57` 45.4
Galactic Latitude-30.51 degrees
Galactic Longitude156.66 degrees
1997 Distance from Earth16.51 Parallax (milliarcseconds)
 197.56 Light Years
 60.57 Parsecs
2007 Distance from Earth15.07 Parallax (milliarcseconds)
 216.43 Light Years
 66.36 Parsecs
 13,687,637.17 Astronomical Units
Galacto-Centric Distance24,305.69 Light Years / 7,452.00 Parsecs
Proper Motion Dec.-92.88 ± 0.81 milliarcseconds/year
Proper Motion RA.-26.28 ± 1.39 milliarcseconds/year
B-V Index0.77
Stellar Luminosity (Lsun)0.49

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.118
Variable Magnitude Range (Brighter - Dimmer)9.905 - 10.065

Estimated Calculated Facts

Radius (x the Sun)0.73
Effective Temperature5,490 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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