Andromeda Xviii

Andromeda XVIII
	DSS image of Andromeda XVIII
Observation data (J2000 epoch)
Constellation	Andromeda
Right ascension	00h 02m 14.5s
Declination	+45° 05′ 20″
Helio radial velocity	−326.2 ± 2.7
Distance	4,420 ± 290 kly (1,355 ± 88 kpc)
Group or cluster	Local Group
Apparent magnitude (V)	15.50 ± 0.24
Absolute magnitude (V)	−10.41 ± 0.28
Characteristics
Type	dG
Mass	4.2×106 ± 0.3×106 M☉
Half-light radius (physical)	325 ± 24
Other designations
	PGC 5056918

Short description: Galaxy in constellation Andromeda

Andromeda XVIII, discovered in 2008, is a dwarf spheroidal galaxy (has no rings, low luminosity, much dark matter, little gas or dust), which is a satellite of the Andromeda Galaxy (M31). It is one of the 14 known dwarf galaxies orbiting M31. It was announced in 2010 that the orbiting galaxies lie close to a plane running through M31's center.^{[citation needed]}

References

↑ ^1.0 ^1.1 ^1.2 McConnachie, Alan W; Huxor, Avon; Martin, Nicolas F; Irwin, Mike J; Chapman, Scott C; Fahlman, Gregory; Ferguson, Annette M. N; Ibata, Rodrigo A et al. (2008). "A Trio of New Local Group Galaxies with Extreme Properties". The Astrophysical Journal 688 (2): 1009. doi:10.1086/591313. Bibcode: 2008ApJ...688.1009M.
↑ ^2.0 ^2.1 Collins, Michelle L. M; Chapman, Scott C; Rich, R. Michael; Ibata, Rodrigo A; Martin, Nicolas F; Irwin, Michael J; Bate, Nicholas F; Lewis, Geraint F et al. (2013). "A Kinematic Study of the Andromeda Dwarf Spheroidal System". The Astrophysical Journal 768 (2): 172. doi:10.1088/0004-637X/768/2/172. Bibcode: 2013ApJ...768..172C.
↑ ^3.0 ^3.1 ^3.2 Makarova, L. N; Makarov, D. I; Karachentsev, I. D; Tully, R. B; Rizzi, L (2017). "Star formation history of And XVIII: a dwarf spheroidal galaxy in isolation". Monthly Notices of the Royal Astronomical Society 464 (2): 2281. doi:10.1093/mnras/stw2502. Bibcode: 2017MNRAS.464.2281M.
↑ "NAME Andromeda XVIII". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Andromeda+XVIII.

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Original source: https://en.wikipedia.org/wiki/Andromeda XVIII. Read more

[McConnachie-1] 1.0 ^1.1 ^1.2 McConnachie, Alan W; Huxor, Avon; Martin, Nicolas F; Irwin, Mike J; Chapman, Scott C; Fahlman, Gregory; Ferguson, Annette M. N; Ibata, Rodrigo A et al. (2008). "A Trio of New Local Group Galaxies with Extreme Properties". The Astrophysical Journal 688 (2): 1009. doi:10.1086/591313. Bibcode: 2008ApJ...688.1009M.

[Collins-2] 2.0 ^2.1 Collins, Michelle L. M; Chapman, Scott C; Rich, R. Michael; Ibata, Rodrigo A; Martin, Nicolas F; Irwin, Michael J; Bate, Nicholas F; Lewis, Geraint F et al. (2013). "A Kinematic Study of the Andromeda Dwarf Spheroidal System". The Astrophysical Journal 768 (2): 172. doi:10.1088/0004-637X/768/2/172. Bibcode: 2013ApJ...768..172C.

[Makarova-3] 3.0 ^3.1 ^3.2 Makarova, L. N; Makarov, D. I; Karachentsev, I. D; Tully, R. B; Rizzi, L (2017). "Star formation history of And XVIII: a dwarf spheroidal galaxy in isolation". Monthly Notices of the Royal Astronomical Society 464 (2): 2281. doi:10.1093/mnras/stw2502. Bibcode: 2017MNRAS.464.2281M.

[4] "NAME Andromeda XVIII". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Andromeda+XVIII.

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v t e Andromeda Galaxy
Location	Andromeda Galaxy → Andromeda subgroup → Local Group → Local Sheet → 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
Catalogued stars	AE Andromedae M31-RV
Other	Andromeda–Milky Way collision S Andromedae Mayall II M32p NGC 206 3XMM J004232.1+411314
Category

Andromeda Xviii

See also

References