Universe Guide

Omicron Columbae

Omicron Columbae Facts

Omicron Columbae's Alternative Names

Omicron Columbae (Omi Col) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR1743. HIP24659 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD34642.

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

Location of Omicron Columbae

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 Omicron Columbae, the location is 05h 17m 29.02 and -34° 53` 39.8 .

Radial Velocity and Proper Motion of Omicron Columbae

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 -336.23 ± 0.18 milliarcseconds/year towards the north and 92.67 ± 0.20 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 21.10 km/s with an error of about 2.80 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.

Omicron Columbae 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 14.95 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 Omicron Columbae

Omicron Columbae Colour and Temperature

Omicron Columbae has a spectral type of K0/K1III/IV. This means the star is a orange to red subgiant star. The star has a B-V Colour Index of 0.98 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,888 Kelvin.

Omicron Columbae Radius

Radius has been calculated as being 4.79 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,335,063.69.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 4.62. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.04 with an error value of 0.03 Fe/H with the Sun has a value of 1 to put it into context.

Omicron Columbae Apparent and Absolute Magnitudes

Omicron Columbae has an apparent magnitude of 4.81 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 2.17 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.25. 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 Omicron Columbae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 29.63 which gave the calculated distance to Omicron Columbae as 110.08 light years away from Earth or 33.75 parsecs. If you want that in miles, it is 622,134,923,244,020.39.

In 2007, Hipparcos data was revised with a new parallax of 30.82 which put Omicron Columbae at a distance of 105.83 light years or 32.45 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 6,693,246.32 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 7,414.00 Parsecs or 24,181.75 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 Omicron Columbae

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 5,392,659,009,000.42 hours or 615,600,343.49 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 Omicron Columbae then it would take 19,609,669,123.64 hours / 2,238,546.70 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 110.08 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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.

Hide Explanations
Show GridLines

Additional Omicron Columbae Facts and Figures

Visual Facts

Primary / Proper / Traditional NameOmicron Columbae
Alternative NamesOmi Col, HD 34642, HIP 24659, HR 1743
Spectral TypeK0/K1III/IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude 2.17 / 2.25
Visual / Apparent Magnitude4.81
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 17m 29.02
Declination (Dec.)-34° 53` 39.8
Galactic Latitude-33.49 degrees
Galactic Longitude238.51 degrees
1997 Distance from Earth29.63 Parallax (milliarcseconds)
 110.08 Light Years
 33.75 Parsecs
2007 Distance from Earth30.82 Parallax (milliarcseconds)
 105.83 Light Years
 32.45 Parsecs
 6,693,246.32 Astronomical Units
Galacto-Centric Distance24,181.75 Light Years / 7,414.00 Parsecs
Proper Motion Dec.-336.23 ± 0.18 milliarcseconds/year
Proper Motion RA.92.67 ± 0.20 milliarcseconds/year
B-V Index0.98
Radial Velocity21.10 ± 2.80 km/s
Iron Abundance-0.04 ± 0.03 Fe/H
Semi-Major Axis5790.00
Stellar Luminosity (Lsun)14.95

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)4.62
Effective Temperature4,888 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine