Universe Guide

Omega1 Aquarii (102 Aquarii) Star Facts

Omega1 Aquarii Facts

  • Omega1 Aquarii is a subgiant star that can be located in the constellation of Aquarius. The description is based on the spectral class.
  • Omega1 Aquarii is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A7IV) of the star, the star's colour is blue - white .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 142.18 light years away from us. Distance

Omega1 Aquarii's Alternative Names

Omega1 Aquarii (Ome01 Aqr) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR8968. HIP116758 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD222345.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 102 Aquarii. The Flamsteed name can be shortened to 102 Aqr.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 253 G. Aquarii. There are no stars with a Gould designation in Ursa Major for example.

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-15 6471.

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

Location of Omega1 Aquarii

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 Omega1 Aquarii, the location is 23h 39m 47.04 and -14° 13` 19.4 .

Radial Velocity and Proper Motion of Omega1 Aquarii

Proper Motion

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 -55.35 ± 0.59 milliarcseconds/year towards the north and 51.25 ± 1.05 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -2.00000 km/s with an error of about 4.20 km/s . 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 Omega1 Aquarii

Omega1 Aquarii Colour and Temperature

Based on the star's spectral type of A7IV , Omega1 Aquarii's colour and type is blue - white subgiant star. The star has a B-V Colour Index of 0.25 which means the star's temperature is about 7,483 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Omega1 Aquarii 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 16.09 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Omega1 Aquarii Radius

Omega1 Aquarii estimated radius has been calculated as being 2.31 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,604,048.84.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 2.4588641686933885208862253454. 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.

Omega1 Aquarii Apparent and Absolute Magnitudes

Omega1 Aquarii has an apparent magnitude of 4.97 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 1.91 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.77. 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 Omega1 Aquarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 24.38000 which gave the calculated distance to Omega1 Aquarii as 133.78 light years away from Earth or 41.02 parsecs. If you want that in miles, it is about 786,442,502,424,503.35, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 22.94000 which put Omega1 Aquarii at a distance of 142.18 light years or 43.59 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 8,991,020.25 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 7,394.00 Parsecs or 24,116.52 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 Omega1 Aquarii

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 A380736129,549,283.03
Speed of Sound (Mach 1)767.269124,269,678.97
Concorde (Mach 2)1,534.5462,134,758.50
New Horizons Probe33,0002,889,341.59
Speed of Light670,616,629.00142.18

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 Omega1 Aquarii Facts and Figures

Visual Facts

Primary / Proper / Traditional NameOmega1 Aquarii
Alternative NamesOme01 Aqr, HD 222345, HIP 116758, HR 8968, 253 G. Aquarii, 102 Aquarii, 102 Aqr, BD-15 6471
Spectral TypeA7IV
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeSubgiant Star
GalaxyMilky Way
Absolute Magnitude 1.91 / 1.77
Visual / Apparent Magnitude4.97
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 39m 47.04
Declination (Dec.)-14° 13` 19.4
Galactic Latitude-68.89378937 degrees
Galactic Longitude67.04020154 degrees
1997 Distance from Earth24.38000 Parallax (milliarcseconds)
 133.78 Light Years
 41.02 Parsecs
2007 Distance from Earth22.94000 Parallax (milliarcseconds)
 142.18 Light Years
 43.59 Parsecs
 8,991,020.25 Astronomical Units
Galacto-Centric Distance24,116.52 Light Years / 7,394.00 Parsecs
Proper Motion Dec.-55.35000 ± 0.59000 milliarcseconds/year
Proper Motion RA.51.25000 ± 1.05000 milliarcseconds/year
B-V Index0.25
Radial Velocity-2.00000 ± 4.20 km/s
Semi-Major Axis7449.0000000
Stellar Luminosity (Lsun)16.0900000
Associated / Clustered StarsOmega2 Aquarii

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)2.46
Effective Temperature7,483 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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