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PP Serpentis

PP Serpentis Facts

PP Serpentis's Alternative Names

HIP76515 is the reference name for the star in the Hipparcos Star Catalogue.

PP Serpentis has alternative name(s) :- , PP 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+22 2862.

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

Location of PP Serpentis

The location of the variable 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 PP Serpentis, the location is 15h 37m 37.62 and +21° 51` 31.7 .

Physical Properties (Colour, Temperature) of PP Serpentis

PP Serpentis Colour and Temperature

PP Serpentis has a spectral type of M2. This means the star is a red variable star. The star has a B-V Colour Index of 1.73 which means the star's temperature is about 3,339 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

PP Serpentis Radius

Radius has been calculated as being 394.21 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 274,290,927.43.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

PP Serpentis Apparent and Absolute Magnitudes

PP Serpentis has an apparent magnitude of 10.02 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -5.75 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 PP Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.07 which gave the calculated distance to PP Serpentis as 46594.76 light years away from Earth or 14285.71 parsecs. If you want that in miles, it is 31,247,220,880,264.

Travel Time to PP 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)
Walking47,811,805,220,066.01
Car120260,393,507,335.53
Airbus A38073642,455,463,152.53
Speed of Sound (Mach 1)767.26940,725,248,746.22
Concorde (Mach 2)1,534.5420,362,597,834.05
New Horizons Probe33,000946,885,481.22
Speed of Light670,616,629.0046,594.76
PP Serpentis brightness ranges from a magnitude of 10.227 to a magnitude of 10.008 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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 PP Serpentis Facts and Figures

Visual Facts


Primary / Proper / Traditional NamePP Serpentis
Alternative NamesHIP 76515, BD+22 2862, PP Ser
Spectral TypeM2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationSerpens
Absolute Magnitude -5.75
Visual / Apparent Magnitude10.02
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)15h 37m 37.62
Declination (Dec.)+21° 51` 31.7
Galactic Latitude52.00 degrees
Galactic Longitude34.29 degrees
Distance from Earth0.07 Parallax (milliarcseconds)
 46594.76 Light Years
 14285.71 Parsecs
 2,946,618,672.93 Astronomical Units
B-V Index1.73

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.193
Variable Magnitude Range (Brighter - Dimmer)10.008 - 10.227

Estimated Calculated Facts


Radius (x the Sun)394.21
Effective Temperature3,339 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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