NGC 55
Galaxy NGC 55 |
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ESO : Taken through the 2.2 meter telescope at the La Silla Observatory | |
AladinLite | |
Constellation | sculptor |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 00 h 14 m 53.60 s |
declination | -39 ° 11 ′ 47.9 ″ |
Appearance | |
Morphological type | SB (s) m: / sp |
Brightness (visual) | 7.8 likes |
Brightness (B-band) | 8.4 mag |
Angular expansion | 32.4 ′ × 5.6 ′ |
Position angle | 108 ° |
Surface brightness | 13.3 mag / arcmin² |
Physical data | |
Affiliation |
Sculptor group SSRS group 49 NGC 55 group LGG 4 |
Redshift | 0.000430 ± 0.000007 |
Radial velocity | +129 ± 2 km / s |
Stroke distance v rad / H 0 |
(4 ± 0) x 10 6 ly (1.34 ± 0.10) Mpc |
Absolute brightness | −18.5 mag |
Dimensions | approx. 2 · 10 10 M ☉ |
diameter | 55,000 ly |
history | |
discovery | James Dunlop |
Discovery date | 4th August 1826 |
Catalog names | |
NGC 55 • PGC 1014 • ESO 293-050 • MCG -07-01-013 • IRAS 00125-3928 • 2MASX J00145360-3911478 • SGC 001238-3929.9 • GC 27 • h 2315 • HIPASS J0015-39 • LDCE 26 NED003 |
NGC 55 is a barred spiral galaxy of the Hubble type SBm visible from the side in the constellation Sculptor in the southern sky . It is estimated to be 6 million light years from the Milky Way and 55,000 light years across. NGC 55 has an angular extent of 32.4 '× 5.6' and an apparent magnitude of +7.8 mag, making this spiral galaxy the twelfth brightest galaxy in the sky.
Although the star system is counted as part of the Sculptor Group , it has a radial velocity that suggests that it belongs to the Local Group . In fact, the galaxy lies on the border between the Sculptor and Local Groups. She is the brightest member of the NGC 55 group ( LGG 4 ).
NGC 55 and NGC 300 are only about a million light years apart, so it's believed to be a gravitationally bound pair.
The object was discovered by James Dunlop on August 4, 1826 . The pronounced eastern section of the galaxy, which the astronomer Lewis Swift observed on September 23, 1897, received its own entry in the index catalog ( IC 1537 ).
NGC 55 group ( LGG 4 )
Galaxy | Alternative name | Distance / million ly |
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NGC 55 | PGC 1014 | 4th |
NGC 300 | PGC 3238 | 5 |
NGC 7793 | PGC 73049 | 10 |
PGC 621 | ESO 349-031 | |
PGC 3589 | ESO 351-030 | |
PGC 3721 | ESO 295-029 | |
PGC 3829 | ESO 352-002 |
Web links
- SIMBAD Astronomical Database
- Aladin Lite
- Antilhue Chile
- Irregular Galaxy NGC 55 - Astronomy Picture of the Day October 10, 2008.
- Irregular Galaxy NGC 55 - Astronomy Picture of the Day from August 12, 2009.
- Spektrum.de : Amateur recordings [1]