NGC 247 is a bright galaxy in the constellation Cetus . This object is one of those listed in the original edition of the New General Catalog .
| NGC 247 | |
|---|---|
| Galaxy | |
 Photo of the galaxy in the ultraviolet range, taken by the GALEX space telescope. | |
| Research history | |
| Discoverer | William Herschel |
| opening date | October 20, 1784 |
| Designations | NGC 247 , ESO 540-22 , PGC 2758 |
| Observational data ( Age J2000.0 ) | |
| Constellation | Whale |
| Right ascension | |
| Declination | |
| Visible dimensions | 19.2 '× 5.5' |
| Apparent magnitude m V | 8.9 |
| Photographic magnitude m B | 9.6 |
| Specifications | |
| Type of | Sbcd |
| Included in | |
| Redshift | +0.000527 ± 0.000013 |
| Distance | 11.8 million St. years old 3.63 ± 0.15 Mpc [1] |
| Angular position | 172 ° |
| Surface brightness | 13.8 |
NGC 247 is a small spiral galaxy visible almost from the edge, has a compact core. Belongs to the group of galaxies closest to us [2] , called the Sculptor group . According to the observations of 3 different telescopes in 2002-2005, 33 variable stars of the Cephei type δ were discovered in the galaxy. Studying the periods of stars made it possible to calculate the distance to the galaxy equal to 11.8 million sv. years with an accuracy of 6%. [one]
In the sky near NGC 247 there is a group of 4 galaxies, called because of its configuration, the Burbidge's Chain [3] , in the photo at the top left. The group is not gravitationally connected with NGC 247 and is about 350 million light-years distant from us — more than 30 times farther than NGC 247.
Content
Notes
- ↑ 1 2 Alejandro García-Varela and others. The Araucaria Project: the Distance to the Sculptor Group Galaxy NGC 247 from Cepheid Variables Discovered in a Wide-Field Imaging Survey // The Astronomical Journal. - 2008. - T. 136 , No. 5 . - S. 1770-1777 . arXiv: astro-ph / 0808.3327
- ↑ If you do not take into account the Local Group , which includes the Milky Way .
- ↑ Balkowski, C. & Chamaraux, P. Is the Chain of Galaxies near NGC 247 Anomalous? // Astronomy and Astrophysics. - 1975 .-- T. 43 . - S. 297 .
See also
- List of Messier objects
- New shared directory
Literature
- Alan B. Whiting. Angular Momentum in the Sculptor Group (Eng.) // The Astronomical Journal. - 1999. - DOI : 10.1086 / 300702 .
- TJ Davidge and S. Courteau. Near-Infrared Adaptive Optics Imaging of the Central Regions of Nearby Sc Galaxies. II. NGC 247 and NGC 2403 (Eng.) // The Astronomical Journal. - 2002. - DOI : 10.1086 / 338901 .
- M. Mouhcine, HC Ferguson, RM Rich, TM Brown, and TE Smith. Halos of Spiral Galaxies. II. Halo Metallicity-Luminosity Relation // The Astrophysical Journal . - 2005 .-- DOI : 10.1086 / 468178 . - arXiv : astro-ph / 0510254 .
- M. Mouhcine, RM Rich, HC Ferguson, TM Brown, and TE Smith. Halos of Spiral Galaxies. III. Metallicity Distributions // The Astrophysical Journal . - 2005 .-- DOI : 10.1086 / 468179 . - arXiv : astro-ph / 0510255 .
- Julie B. Nantais, John P. Huchra, Pauline Barmby, Knut AG Olsen, and Tom H. Jarrett. Nearby Spiral Globular Cluster Systems. I. Luminosity Functions // The Astronomical Journal. - 2006. - DOI : 10.1086 / 500011 .
- TJ Davidge. The Disk and Extraplanar Environment of NGC 247 // The Astrophysical Journal . - 2006. - DOI : 10.1086 / 500504 . - arXiv : astro-ph / 0603331 .
- M. Mouhcine. The Outskirts of Spiral Galaxies: Evidence for Multiple Stellar Populations // The Astrophysical Journal . - 2006. - DOI : 10.1086 / 504104 . - arXiv : astro-ph / 0603191 .
- Alejandro García-Varela, Grzegorz Pietrzyński, Wolfgang Gieren, Andrzej Udalski, Igor Soszyński, Alistair Walker, Fabio Bresolin, Rolf-Peter Kudritzki, Olaf Szewczyk, Michał Szymański, Marcin Kubizows, cin. The Araucaria Project: The Distance to the Sculptor Group Galaxy NGC 247 from Cepheid Variables Discovered in a Wide-Field Imaging Survey // The Astronomical Journal. - 2008. - DOI : 10.1088 / 0004-6256 / 136/5/1770 . - arXiv : 0808.3327 .
- Wolfgang Gieren, Grzegorz Pietrzyński, Igor Soszyński, Olaf Szewczyk, Fabio Bresolin, Rolf-Peter Kudritzki, Miguel A. Urbaneja, Jesper Storm, Dante Minniti, and Alejandro García-Varela. The Araucaria Project: The Distance to the Sculptor Galaxy NGC 247 from Near-Infrared Photometry of Cepheid Variables // The Astrophysical Journal . - 2009. - DOI : 10.1088 / 0004-637X / 700/2/1141 . - arXiv : 0905.2699 .
- Jing Jin, Hua Feng, Philip Kaaret, and Shuang-Nan Zhang. XMM-Newton Observations of NGC 247: X-Ray Population and a Supersoft Ultraluminous X-Ray Source // The Astrophysical Journal . - 2011. - DOI : 10.1088 / 0004-637X / 737/2/87 . - arXiv : 1101.3363 .
Links
- Information in English and French from the original “ New General Catalog ”
- Information (Eng.) From the Revised New General Catalog
- SIMBAD
- VizieR (English)
- NASA / IPAC Extragalactic Database
- List of NGC 247 publications