NGC 55

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Galaxy
NGC 55
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Irregular Galaxy NGC 55 (ESO 0914a) .jpg
ESO : Taken through the 2.2 meter telescope at the La Silla Observatory
AladinLite
Constellation sculptor
Position
equinox :  J2000.0 , epoch : J2000.0
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
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

Commons : NGC 55  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e f SEDS : NGC 55
  3. ^ VizieR
  4. ↑ Seligman