Universe Guide

Omega Serpentis (34 Serpentis) Star Facts

Omega Serpentis Facts

  • Omega Serpentis is a giant star that can be located in the constellation of Serpens. The description is based on the spectral class.
  • Omega Serpentis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G8III) of the star, the star's colour is yellow .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Omega Serpentis has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 273.40 light years away from us. Distance

Omega Serpentis's Alternative Names

Omega Serpentis (Ome Ser) 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 HR5888. HIP77578 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD141680.

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 34 Serpentis. The Flamsteed name can be shortened to 34 Ser.

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 28 Cap G. Serpentis. 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+02 3007.

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

Location of Omega Serpentis

The location of the giant 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 Omega Serpentis, the location is 15h 50m 17.53 and +02° 11` 47.8 .

Radial Velocity and Proper Motion of Omega Serpentis

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 -47.31 ± 0.18 milliarcseconds/year towards the north and 29.15 ± 0.28 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 -3.79000 km/s with an error of about 0.23 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 Omega Serpentis

Omega Serpentis Colour and Temperature

Based on the star's spectral type of G8III , Omega Serpentis's colour and type is yellow giant star. The star has a B-V Colour Index of 1.01 which means the star's temperature is about 4,830 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Omega Serpentis 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 70.95 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Omega Serpentis Radius

Omega Serpentis estimated radius has been calculated as being 9.75 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,784,016.46.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 10.162565364866272062315779824. 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.

Omega Serpentis Mass

The Omega Serpentis's solar mass is 2.17 times that of our star, the Sun. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

Omega Serpentis Metalicity

The star's metallicity is -0.240000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

Omega Serpentis Apparent and Absolute Magnitudes

Omega Serpentis has an apparent magnitude of 5.21 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 0.68 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.59. 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 Omega Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.40000 which gave the calculated distance to Omega Serpentis as 263.03 light years away from Earth or 80.65 parsecs. If you want that in miles, it is about 1,546,254,831,908,484.94, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 11.93000 which put Omega Serpentis at a distance of 273.40 light years or 83.82 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 17,288,995.59 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 7,338.00 Parsecs or 23,933.87 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 Omega Serpentis

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 A380736249,112,209.74
Speed of Sound (Mach 1)767.269238,959,981.92
Concorde (Mach 2)1,534.54119,479,835.24
New Horizons Probe33,0005,555,957.16
Speed of Light670,616,629.00273.40

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 Omega Serpentis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameOmega Serpentis
Alternative NamesOme Ser, HD 141680, HIP 77578, HR 5888, 28 Cap G. Serpentis, 34 Serpentis, 34 Ser, BD+02 3007
Spectral TypeG8III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude 0.68 / 0.59
Visual / Apparent Magnitude5.21
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 50m 17.53
Declination (Dec.)+02° 11` 47.8
Galactic Latitude40.50146854 degrees
Galactic Longitude10.53804413 degrees
1997 Distance from Earth12.40000 Parallax (milliarcseconds)
 263.03 Light Years
 80.65 Parsecs
2007 Distance from Earth11.93000 Parallax (milliarcseconds)
 273.40 Light Years
 83.82 Parsecs
 17,288,995.59 Astronomical Units
Galacto-Centric Distance23,933.87 Light Years / 7,338.00 Parsecs
Proper Motion Dec.-47.31000 ± 0.18000 milliarcseconds/year
Proper Motion RA.29.15000 ± 0.28000 milliarcseconds/year
B-V Index1.01
Radial Velocity-3.79000 ± 0.23 km/s
Iron Abundance-0.2000 ± 0.03 Fe/H
Semi-Major Axis7926.0000000
Stellar Luminosity (Lsun)70.9500000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Calculated Facts

Radius (x the Sun)10.16
Effective Temperature4,830 Kelvin
Mass Compared to the Sun2.17

Sources and Links

SIMBAD SourceLink

List of Extrasolar Planets orbiting Omega Serpentis

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
ome Ser bConfirmed277.0200.10620131.1132.000

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