Pegasus Dwarf Spheroidal Galaxy

"Andromeda 6" redirects here. For the star, see 6 Andromedae.

Pegasus Dwarf Spheroidal Galaxy

Observation data (J2000 epoch)
Constellation	Pegasus
Right ascension	23^h 51^m 46.3^s^[1]
Declination	+24° 34′ 57″^[1]
Redshift	−354 ± 3 km/s^[1]
Distance	2.7 ± 0.1 Mly (820 ± 20 kpc)^[2]^[3]
Apparent magnitude (V)	14.2^[1]
Characteristics
Type	dSph^[2]
Apparent size (V)	4′.0 × 2′.0^[1]
Notable features	-
Other designations
Pegasus II,^[1] Andromeda VI,^[1] Peg dSph,^[1] KKH 99,^[1] PGC 2807158

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 and a satellite galaxy of the Andromeda Galaxy (M31).

General information

The Pegasus Dwarf Spheroidal is a galaxy with mainly metal-poor stellar populations.^[4] Its metallicity is [Fe/H] ≃ −1.3.^[5] 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.

The galaxy was discovered in 1999^[6] by various authors on the Second Palomar Observatory Sky Survey (POSS II) films.^[7]

^{^} 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)^[2]

1 2 3 4 5 6 7 8 9 "NASA/IPAC Extragalactic Database". Results for Pegasus Dwarf Spheroidal. Retrieved 2006-11-11.
1 2 3 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. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6.
↑ I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal. 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
↑ Van den Bergh, Sidney (May 15, 2000). The Galaxies of the Local Group. Google Books: Cambridge Astrophysics. p. 240. ISBN 0521651816. Retrieved March 21, 2015.
↑ 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. arXiv:astro-ph/0410489. Bibcode:2005MNRAS.356..979M. doi:10.1111/j.1365-2966.2004.08514.x.
↑ Pritzl, Barton J.; Armandroff, Taft E.; Jacoby, George H.; Da Costa, G. S. (May 2005). "The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda I and Andromeda III". The Astronomical Journal. 129 (5): 2232–2256. arXiv:astro-ph/0501083. Bibcode:2005AJ....129.2232P. doi:10.1086/428372.
↑ Wallace Sargent. "The Second Palomar Observatory Sky Survey (POSS II)". Caltech.

Andromeda Galaxy

Location	Andromeda Galaxy→Andromeda subgroup → Local Group → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe Each → may be read as "within" or "part of".

Satellite galaxies	M32 M110 NGC 185 NGC 147 Andromeda I Andromeda II Andromeda III Andromeda IV* Andromeda V Andromeda VI Andromeda VII Andromeda VIII Andromeda IX Andromeda X Andromeda XI Andromeda XII Andromeda XIII Andromeda XIV Andromeda XV Andromeda XVI Andromeda XVII Andromeda XVIII Andromeda XIX Andromeda XX Andromeda XXI Andromeda XXII Andromeda XXIII Andromeda XXIV Andromeda XXV Andromeda XXVI Andromeda XXVII Andromeda XXVIII Andromeda XXIX Triangulum Galaxy* *It is uncertain whether it is a companion galaxy of the Andromeda Galaxy

Other	Andromeda–Milky Way collision S Andromedae Mayall II NGC 206 AE Andromedae

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