The Pegasus Dwarf Spheroidal (also known as Andromeda VI or Peg dSph for short) is a dwarf spheroidal galaxy

Dwarf spheroidal galaxy

Dwarf spheroidal galaxy is a term in astronomy applied to low luminosity galaxies that are companions to the Milky Way and to the similar systems that are companions to the Andromeda Galaxy M31...

 about 2.7 million

1 E22 m

To help compare different orders of magnitude, this page lists distances starting at 10 Zm .Distances shorter than 10 Zm* 24 Zm — 2.5 million light years — Distance to the Andromeda Galaxy...

 light-year

Light-year

A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...

s away in the constellation

Constellation

In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....

 Pegasus

Pegasus (constellation)

Pegasus is a constellation in the northern sky, named after the winged horse Pegasus in Greek mythology. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations.-Stars:...

. The Pegasus Dwarf is a member of the Local group of galaxies and a satellite galaxy

Satellite galaxy

A satellite galaxy orbits a larger galaxy due to gravitational attraction. Although a galaxy is made of a large number of objects which are not connected to each other, it has a center of mass, which represents a weighted average of the positions of each component object...

 of the Andromeda Galaxy

Andromeda Galaxy

The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years from Earth in the constellation Andromeda. It is also known as Messier 31, M31, or NGC 224, and is often referred to as the Great Andromeda Nebula in older texts. Andromeda is the nearest spiral galaxy to the...

 (M31).

General information

Pegasus Dwarf Spheroidal is a galaxy with mainly metal-poor stellar populations. Its metallicity is [Fe/H] ≃ −1.3. It is located at the right ascension

Right ascension

Right ascension is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.-Explanation:...

 23h51m46.30s and declination

Declination

In astronomy, declination is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Declination in astronomy is comparable to geographic latitude, but projected onto the celestial sphere. Declination is measured in degrees north and...

 +24d34m57.0s in the equatorial coordinate system

Equatorial coordinate system

The equatorial coordinate system is a widely-used method of mapping celestial objects. It functions by projecting the Earth's geographic poles and equator onto the celestial sphere. The projection of the Earth's equator onto the celestial sphere is called the celestial equator...

 (epoch

Epoch (astronomy)

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as celestial coordinates, or elliptical orbital elements of a celestial body, where these are subject to perturbations and vary with time...

 J2000.0), and in a distance of 820 ± 20 kpc

Parsec

The parsec is a unit of length used in astronomy. It is about 3.26 light-years, or just under 31 trillion kilometres ....

 from Earth

Earth

Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...

 and a distance of 294 ± 8 kpc

Parsec

The parsec is a unit of length used in astronomy. It is about 3.26 light-years, or just under 31 trillion kilometres ....

from the Andromeda Galaxy

Andromeda Galaxy

The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years from Earth in the constellation Andromeda. It is also known as Messier 31, M31, or NGC 224, and is often referred to as the Great Andromeda Nebula in older texts. Andromeda is the nearest spiral galaxy to the...

.

Pegasus Dwarf Spheroidal was discovered in 1999 by various authors on the Second Palomar

Palomar Observatory

Palomar Observatory is a privately owned observatory located in San Diego County, California, southeast of Pasadena's Mount Wilson Observatory, in the Palomar Mountain Range. At approximately elevation, it is owned and operated by the California Institute of Technology...

 Sky Survey (POSS-II) films.

External links

• NASA/IPAC Extragalactic Database: Pegasus Dwarf Spheroidal
• Armandroff, Jacoby, & Davies, "Low Surface Brightness Galaxies around M31", Astrophys. J. 118, 1220-1229 (1999).

See also

• Andromeda's satellite galaxies
  Andromeda's satellite galaxies
  The Andromeda Galaxy has satellite galaxies just like the Milky Way Galaxy. Orbiting M31 are at least 14 dwarf galaxies: the brightest and largest is M32, which can be seen with a backyard telescope. The second brightest and closest one to M32 is M110...
  
  
• Pegasus Dwarf Irregular Galaxy
  Pegasus Dwarf Irregular Galaxy
  The Pegasus Dwarf Irregular Galaxy is an irregular galaxy and a dwarf galaxy in the direction of the constellation Pegasus. It was discovered by A.G. Wilson in the 1950s...
  
   (Peg DIG)
• Pegasus galaxy, the Stargate Atlantis
  Stargate Atlantis
  Stargate Atlantis is a Canadian-American adventure and military science fiction television series and part of MGM's Stargate franchise. The show was created by Brad Wright and Robert C. Cooper as a spin-off series of Stargate SG-1, which was created by Wright and Jonathan Glassner and was itself...
  
  fictional location (probably the Pegasus Dwarf Irregular Galaxy).