Andromeda XVIII
| Andromeda XVIII | |
|---|---|
Foto DSS dari Andromeda XVIII | |
| Data pengamatan (J2000 epos) | |
| Rasi bintang | Andromeda |
| Asensio rekta | 00j 02m 14.5d[1] |
| Deklinasi | +45° 05′ 20″[1] |
| Kecepatan radial helio | −326.2 ± 2.7[2] |
| Jarak | 4.420 ± 290 kly (1.355 ± 88 kpc) |
| Kelompok dan gugusan galaksi | Local Group |
| Magnitudo semu (V) | 15.50 ± 0.24[3] |
| Magnitudo mutlak (V) | −10.41 ± 0.28[3] |
| Ciri-ciri | |
| Jenis | dG[1] |
| Massa | 4,2×106 ± 0,3×106[3] M☉ |
| Jari-jari setengah cahaya (fisik) | 325 ± 24[2] |
| Penamaan lain | |
| PGC 5056918[4] | |
Andromeda XVIII, ditemukan pada tahun 2008, dan merupakan sebuah galaksi katai bulat (tidak memiliki cincin, luminositas rendah, banyak materi gelap, sedikit gas atau debu). Galaksi ini merupakan galaksi satelit dari Galaksi Andromeda (M31), dan merupakan salah satu dari 14 galaksi katai yang diketahui mengorbit M31. Pada tahun 2010 diumumkan bahwa galaksi yang mengorbit terletak dekat dengan sebuah bidang yang melintasi pusat M31.[butuh rujukan]
Lihat pula
Referensi
- ^ a b c McConnachie, Alan W; Huxor, Avon; Martin, Nicolas F; Irwin, Mike J; Chapman, Scott C; Fahlman, Gregory; Ferguson, Annette M. N; Ibata, Rodrigo A; Lewis, Geraint F; Richer, Harvey; Tanvir, Nial R (2008). "A Trio of New Local Group Galaxies with Extreme Properties". The Astrophysical Journal. 688 (2): 1009. arXiv:0806.3988. Bibcode:2008ApJ...688.1009M. doi:10.1086/591313.
- ^ a b 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; Peñarrubia, Jorge; Arimoto, Nobuo; Casey, Caitlin M; Ferguson, Annette M. N; Koch, Andreas; McConnachie, Alan W; Tanvir, Nial (2013). "A Kinematic Study of the Andromeda Dwarf Spheroidal System". The Astrophysical Journal. 768 (2): 172. arXiv:1302.6590. Bibcode:2013ApJ...768..172C. doi:10.1088/0004-637X/768/2/172.
- ^ a b c 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. arXiv:1609.09706. Bibcode:2017MNRAS.464.2281M. doi:10.1093/mnras/stw2502. Pemeliharaan CS1: DOI bebas tanpa ditandai (link)
- ^ "NAME Andromeda XVIII". SIMBAD. Centre de données astronomiques de Strasbourg. Diakses tanggal 19 September 2017.
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