NGC 4990

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Galaxy
NGC 4990
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High-resolution image of the spiral galaxy NGC 4990 taken with the Hubble Space Telescope
High-resolution image of the spiral galaxy NGC 4990 taken with the Hubble Space Telescope
AladinLite
Constellation Virgin
Position
equinoxJ2000.0 , epoch : J2000.0
Right ascension 13 h 09 m 17.3 s
declination -05 ° 16 ′ 22 ″
Appearance
Morphological type S0 / HII  
Brightness  (visual) 13.9 likes
Brightness  (B-band) 14.9 mag
Angular expansion 1.0 ′ × 0.8 ′
Position angle 55 °
Surface brightness 13.5 mag / arcmin²
Physical data
Redshift 0.010574 +/- 0.000023  
Radial velocity 3170 +/- 7 km / s  
Stroke distance
v rad  / H 0
(138 ± 10)  ·  10 6  ly
(42.3 ± 3.0)  Mpc 
history
discovery Heinrich d'Arrest
Discovery date March 23, 1865
Catalog names
NGC  4990 • PGC  45608 • MCG  -01-34-004 • IRAS  13067-0500 • 2MASX  J13091728-0516219 • Mrk  1344 • GC  5718 • LDCE 0947 NED002 • LEDA 45608

NGC 4990 , also known as the Cocoon Galaxy , is a 13.9 mag bright lens-shaped galaxy with an active nucleus of the Hubble type S0 in the constellation Virgo north of the ecliptic . It has extensive HII regions with a high rate of star formation . The galaxy is estimated to be 138 million light years away from the Milky Way and has a diameter of around 40,000 ly.
In the same area of ​​the sky are the galaxies NGC 4975 , NGC 4989 , IC 855 , among others .

The object was discovered on March 23, 1865 by Heinrich Louis d'Arrest .

Web links

  • NGC 4990. SIMBAD, accessed February 23, 2015 .
  • NGC 4990. DSO Browser, accessed February 23, 2015 .
  • Auke Slotegraaf: NGC 4990. Deep Sky Observer's Companion, accessed on February 23, 2015 .

Individual evidence

  1. a b c NASA / IPAC Extragalactic Database
  2. a b c d e f SEDS : NGC 4990
  3. Seligman