Key facts
- Constellation
- Pisces
- Right ascension
- 00 47 54.0517
- Declination
- +19 ° 35 ′ 48.788 ″
- Heliocentric radial velocity
- 4556 km/s
- Distance
- 204.36 ± 12.64 Mly (62.657 ± 3.876 Mpc )
- Type
- Sc
- Size
- 149,300 ly (45,780 pc )
- Apparent size v
- 2.4 ′ × 1.9 ′
via Wikipedia infobox
Wikidata facts
- Instance of
- spiral galaxy
- Constellation
- Pisces
- Distance from Earth
- 56.23
- Image
- NGC 251.png
Show 11 more facts
- catalog code
- LEDA 2806
- galaxy morphological type
- Sc
- Commons category
- NGC 251
- discoverer or inventor
- William Herschel
- time of discovery or invention
- 1784-10-15
- redshift
- 0.015241
- radial velocity
- 4556
- apparent magnitude
- 9.822
- right ascension
- 11.9751292
- declination
- 19.5968083
- epoch
- J2000.0
via Wikidata · CC0
~1 min read
Encyclopedic overview
NGC 251 is a spiral galaxy in the constellation of Pisces. Its velocity with respect to the cosmic microwave background for is 4,224±23 km/s, which corresponds to a Hubble distance of 203.2 ± 14.3 Mly (62.30 ± 4.37 Mpc). Additionally, six non redshift measurements give a distance of 205.32 ± 5.54 Mly (62.950 ± 1.699 Mpc). It was discovered on October 15, 1784, by German-British astronomer William Herschel.
According to I.D. Karachentsev, NGC 251 forms an isolated galaxy pair with UGC 477.
Excerpted from Wikipedia’s “Q1035883” article, available under the CC BY-SA 4.0 licence.