HIP74556 is the reference name for the star in the Hipparcos Star Catalogue.
AP Serpentis has alternative name(s) :- AP Ser, AP Ser.
More details on objects' alternative names can be found at Star Names .
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 AP Serpentis, the location is 15h 14m 00.95 and +09° 58` 52.2 .
AP Serpentis has a spectral type of A9.5. This means the star is a blue - white variable star. The star's Iron Abundance is -1.52 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.
AP Serpentis has an apparent magnitude of 11.10 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 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -4.74 which gave the calculated distance to AP Serpentis as 0 light years away from Earth or 0 parsecs. If you want that in miles, it is 0.
The star is a pulsating RR Lyrae type with n variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. AP Serpentis brightness ranges from a magnitude of 11.418 to a magnitude of 10.945 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 days (variability).
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.
|Primary / Proper / Traditional Name||AP Serpentis|
|Alternative Names||AP Ser, HIP 74556, AP Ser|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Variable Star|
|Visual / Apparent Magnitude||11.10|
|Naked Eye Visible||Requires a 4.5 - 6 Inch Telescope - Magnitudes|
|Right Ascension (R.A.)||15h 14m 00.95|
|Declination (Dec.)||+09° 58` 52.2|
|Galactic Latitude||52.31 degrees|
|Galactic Longitude||12.77 degrees|
|Distance from Earth||-4.74 Parallax (milliarcseconds)|
|0 Light Years|
|0.00 Astronomical Units|
|Radial Velocity||-88.50 ± 2.10 km/s|
|Iron Abundance||-1.52 ± 9.99 Fe/H|
|Variable Star Class||Pulsating|
|Variable Star Type||RR Lyrae type with n|
|Mean Variability Period in Days||0.341|
|Variable Magnitude Range (Brighter - Dimmer)||10.945 - 11.418|
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