Universe Guide

2 Serpentis

2 Serpentis Facts

  • 2 Serpentis is a giant star that can be located in the constellation of Virgo. The description is based on the spectral class.
  • 2 Serpentis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2III) 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 2296.92 light years away from us. Distance

2 Serpentis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR5594. HIP73536 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD132933.

2 Serpentis has alternative name(s) :- , NSV 06890.

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 2 Serpentis. The Flamsteed name can be shortened to 2 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 267 G. Virginis. 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+00 3297.

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

Location of 2 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 2 Serpentis, the location is 15h 01m 48.92 and -00° 08` 24.9 .

Radial Velocity and Proper Motion of 2 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 -15.63 ± 0.83 milliarcseconds/year towards the north and 7.25 ± 1.19 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 -33.80000 km/s with an error of about 2.90 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 2 Serpentis

2 Serpentis Colour and Temperature

Based on the star's spectral type of M2III , 2 Serpentis's colour and type is red giant star. The star has a B-V Colour Index of 1.5 which means the star's temperature is about 3,989 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

2 Serpentis Radius

2 Serpentis estimated radius has been calculated as being 44.18 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 30,738,108.17.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 99.35963537390351141387087141. 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.

2 Serpentis Apparent and Absolute Magnitudes

2 Serpentis has an apparent magnitude of 5.71 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 -1.77 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.53. 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 2 Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.19000 which gave the calculated distance to 2 Serpentis as 1022.46 light years away from Earth or 313.48 parsecs. If you want that in miles, it is about 6,010,659,299,065,313.88, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.42000 which put 2 Serpentis at a distance of 2296.92 light years or 704.23 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 145,256,852.34 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.

Travel Time to 2 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 A3807362,092,870,580.82
Speed of Sound (Mach 1)767.2692,007,578,499.17
Concorde (Mach 2)1,534.541,003,787,941.33
New Horizons Probe33,00046,677,355.98
Speed of Light670,616,629.002,296.92
2 Serpentis brightness ranges from a magnitude of 5.820 to a magnitude of 5.770 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 2 Serpentis Facts and Figures

Visual Facts

Primary / Proper / Traditional Name2 Serpentis
Alternative NamesHD 132933, HIP 73536, HR 5594, 267 G. Virginis, 2 Ser, BD+00 3297, NSV 06890
Spectral TypeM2III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude -1.77 / -3.53
Visual / Apparent Magnitude5.71
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 01m 48.92
Declination (Dec.)-00° 08` 24.9
Galactic Latitude48.47802500 degrees
Galactic Longitude357.28376389 degrees
1997 Distance from Earth3.19000 Parallax (milliarcseconds)
 1022.46 Light Years
 313.48 Parsecs
2007 Distance from Earth1.42000 Parallax (milliarcseconds)
 2296.92 Light Years
 704.23 Parsecs
 145,256,852.34 Astronomical Units
Proper Motion Dec.-15.63000 ± 0.83000 milliarcseconds/year
Proper Motion RA.7.25000 ± 1.19000 milliarcseconds/year
B-V Index1.5
Radial Velocity-33.80000 ± 2.90 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.036
Variable Magnitude Range (Brighter - Dimmer)5.770 - 5.820

Estimated Calculated Facts

Radius (x the Sun)99.36
Effective Temperature3,989 Kelvin

Sources and Links

SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
132933+00 3297.0A6.0000017.0000010.00000K0Orange

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