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Gudja (Kappa Serpentis, 35 Serpentis) Star Facts

Gudja Facts

  • Gudja is a giant star that can be located in the constellation of Serpens. The description is based on the spectral class.
  • Gudja is a main star of the constellation outline.
  • Based on the spectral type (M1III) of the star, the star's colour is red .
  • 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 381.92 light years away from us. Distance

Gudja's Alternative Names

Kappa Serpentis (Kap 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 HR5879. HIP77450 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD141477.

Gudja has alternative name(s) :- , NSV 07269.

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 35 Serpentis. The Flamsteed name can be shortened to 35 Ser.

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+18 3074.

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

Location of Gudja

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 Gudja, the location is 15h 48m 44.41 and +18° 08` 30.4 .

Radial Velocity and Proper Motion of Gudja

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 -88.10 ± 0.19 milliarcseconds/year towards the north and -51.88 ± 0.23 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 -38.48000 km/s with an error of about 0.14 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 Gudja

Gudja Temperature and Colour

Based on the star's spectral type of M1III , Gudja's colour and type is red giant star. The star has a B-V Colour Index of 1.61 which means the star's temperature is about 3,754 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Gudja Radius

Gudja estimated radius has been calculated as being 35.80 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 24,912,057.75.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 39.257906935980935736758579077. 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.

Gudja Apparent and Absolute Magnitudes

Gudja has an apparent magnitude of 4.09 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 -1.05 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.25. 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 Gudja

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.36000 which gave the calculated distance to Gudja as 348.47 light years away from Earth or 106.84 parsecs. If you want that in miles, it is about 2,048,524,583,793,292.58, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 8.54000 which put Gudja at a distance of 381.92 light years or 117.10 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 24,153,440.51 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 7,333.00 Parsecs or 23,917.56 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 Gudja

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)
Walking464,030,475,736.92
Car1202,134,349,191.23
Airbus A380736347,991,715.96
Speed of Sound (Mach 1)767.269333,809,788.94
Concorde (Mach 2)1,534.54166,904,676.94
New Horizons Probe33,0007,761,269.79
Speed of Light670,616,629.00381.92
Gudja brightness ranges from a magnitude of 4.213 to a magnitude of 4.173 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 days (variability).

Meteor Showers Radiating from near Gudja

The Kappa Serpentids Meteor Shower radiants from a point near this star. The meteor shower runs typically between 1 Apr- 7 Apr with a peak date of 05-Apr. The speed of a meteor in the shower is 47 Km/s. The amount of meteors predicted to be seen per hour (Zenith Hourly Rate) is 47.

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 Gudja Facts and Figures

Visual Facts


Primary / Proper / Traditional NameGudja
Alternative NamesKappa Serpentis, Kap Ser, HD 141477, HIP 77450, HR 5879, 35 Serpentis, 35 Ser, BD+18 3074, NSV 07269
Spectral TypeM1III
Constellation's Main StarYes
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationSerpens
Absolute Magnitude -1.05 / -1.25
Visual / Apparent Magnitude4.09
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 48m 44.41
Declination (Dec.)+18° 08` 30.4
Galactic Latitude48.33203796 degrees
Galactic Longitude30.09781147 degrees
1997 Distance from Earth9.36000 Parallax (milliarcseconds)
 348.47 Light Years
 106.84 Parsecs
2007 Distance from Earth8.54000 Parallax (milliarcseconds)
 381.92 Light Years
 117.10 Parsecs
 24,153,440.51 Astronomical Units
Galacto-Centric Distance23,917.56 Light Years / 7,333.00 Parsecs
Proper Motion Dec.-88.10000 ± 0.19000 milliarcseconds/year
Proper Motion RA.-51.88000 ± 0.23000 milliarcseconds/year
B-V Index1.61
Radial Velocity-38.48000 ± 0.14 km/s
Eccentricity0.42230
Semi-Major Axis4695.0000000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.025
Variable Magnitude Range (Brighter - Dimmer)4.173 - 4.213

Estimated Calculated Facts


Radius (x the Sun)39.26
Effective Temperature3,754 Kelvin

Sources and Links


SIMBAD SourceLink

Location of Gudja in Serpens


Gudja Location in Serpens

The map was generated using Night Vision, an awesome free application by Brian Simpson.

Serpens Main Stars


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