NGC 4998

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Galaxy
NGC 4998
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with LEDA 2379269 (l) & LEDA 2378954 [1] (u) SDSS
with LEDA 2379269 (l) & LEDA 2378954 (u) SDSS
AladinLite
Constellation Hunting dogs
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 13 h 08 m 10.1 s
declination + 50 ° 39 ′ 49 ″
Appearance
Morphological type Sc  
Brightness  (visual) 14.5 mag
Brightness  (B-band) 15.2 mag
Angular expansion 0.9 ′ × 0.8 ′
Position angle 48 °
Surface brightness 14.0 mag / arcmin²
Physical data
Redshift 0.029737 ± 0.000070  
Radial velocity 8915 ± 21 km / s  
Stroke distance
v rad  / H 0 		(402 ± 28)  ·  10 6  ly
(123.3 ± 8.6)  Mpc 
history
discovery Wilhelm Herschel
Discovery date April 26, 1789
Catalog names
NGC  4998 • PGC  45537 • CGCG  271-015 • MCG  + 09-22-017 • IRAS  13062 + 5054 • 2MASX  J13081011 + 5039491 • GC  3431 • H  III 819 • NSA 143015

NGC 4998 is a 14.5 likes bright spiral galaxy of Hubble type Sc in the constellation of the hunting dogs at the northern sky . It is estimated to be 402 million light-years away from the Milky Way and has a diameter of about 105,000 ly
. a. the galaxy NGC 5009 .

The object was discovered on April 26, 1789 by Wilhelm Herschel with an 18.7-inch reflector telescope, which only noted "vF".

Web links

Individual evidence

  1. ^ Aladin Lite
  2. ↑ a b c NASA / IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e f SEDS : NGC 4998
  4. ↑ Seligman
  5. ↑ Auke Slotegraaf: NGC 4998. Deep Sky Observer's Companion, accessed on February 24, 2015 (English).