Pegasus Dwarf Spheroidal Galaxy

**Pegasus Dwarf Spheroidal Galaxy**
Observation data: J2000 epoch
Pegasus dwarf spheroidal galaxy (center cluster).
Constellation:	Pegasus
Right ascension:	23^h 51^m 46.3^s^[2]
Declination:	+24° 34′ 57″^[2]
Redshift:	-354 ± 3 km/s^[2]
Distance:	2.7 ± 0.1 Mly (820 ± 20 kpc)^[3]^[1]
Type:	dSph^[1]
Apparent dimensions (V):	4′.0 × 2′.0^[2]
Apparent magnitude (V):	14.2^[2]
Notable features:	-
Other designations
Pegasus II,^[2] Andromeda VI,^[2] Peg dSph,^[2] KKH 99^[2]
See also: Galaxy, List of galaxies

The Pegasus Dwarf Spheroidal (also known as Andromeda VI or Peg dSph for short) is a dwarf spheroidal galaxy about 2.7 million light-years away in the constellation Pegasus. The Pegasus Dwarf is a member of the Local group of galaxies and a satellite galaxy of the Andromeda Galaxy (M31).

[edit] General information

Pegasus Dwarf Spheroidal is a galaxy with mainly metal-poor stellar populations.^{[citation needed]} Its metallicity is [Fe/H] ≃ −1.3.^[4] It is located at the right ascension 23h51m46.30s and declination +24d34m57.0s in the equatorial coordinate system (epoch J2000.0), and in a distance of 820 ± 20 kpc from Earth and a distance of 294 ± 8 kpc^[a] from the Andromeda Galaxy.

Pegasus Dwarf Spheroidal was discovered in 1999 by various authors on the Second Palomar Sky Survey (POSS-II) films.

^{^} For an angular distance θ between C and G, their mutual linear distance R is given by:
R² = D²_g + D²_c - 2 × D_g × D_c × cos(θ)^[1]

^ ^a ^b ^c Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics 49 (1): 3-18.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ NASA/IPAC Extragalactic Database. Results for Pegasus Dwarf Spheroidal. Retrieved on 2006-11-11.
^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127: 2031-2068.
^ McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society 356 (4): 979-997.