NGC 4491

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Galaxy
NGC 4491
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NGC 4491 [1] SDSS image
NGC 4491 SDSS image
AladinLite
Constellation Virgin
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 12 h 30 m 57.1 s
declination + 11 ° 29 ′ 01 ″
Appearance
Morphological type SB (s) a: / HII  
Brightness  (visual) 12.6 mag
Brightness  (B-band) 13.5 likes
Angular expansion 1.6 '× 0.8'
Position angle 148 °
Surface brightness 12.8 mag / arcmin²
Physical data
Affiliation Virgo cluster
NGC 4442 group
LGG 288  
Redshift 0.001658 ± 0.000097  
Radial velocity 497 ± 29 km / s  
Stroke distance
v rad  / H 0 		(20 ± 2)  x  10 6  ly
(6.04 ± 0.58)  Mpc 
history
discovery William Herschel
Discovery date March 15, 1784
Catalog names
NGC  4491 • UGC  7657 • PGC  41376 • CGCG  070-140 • MCG  + 02-32-107 • IRAS  12284 + 1145 • 2MASX  J12305713 + 1129007 • VCC  1326 • GC  3039 • H  III 41 • h  1304 • GALEX ASC J123057.19 +112859.6 • LDCE 904 NED160 • VPC 778 • EVCC 2145

NGC 4491 is a spiral dwarf galaxy with extensive star formation regions of the Hubble type SBa in the constellation Virgo on the ecliptic . It is estimated to be 20 million light years away from the Milky Way and about 10,000 light years in diameter. Together with twelve other galaxies it forms the NGC 4442 group ( LGG 288 ) and is listed as a member of the Virgo galaxy cluster under catalog number VCC 1326 .

The galaxies IC 3431 , IC 3437 , IC 3446 , IC 3452 are located in the same area of ​​the sky .

The object was discovered on March 15, 1784 by Wilhelm Herschel .

Web links

Individual evidence

  1. ^ Aladin Lite
  2. ↑ a b c d e f NASA / IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e f SEDS : NGC 4491
  4. ^ VizieR
  5. ↑ Seligman