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NGC 818

Galaxy Evolution Explorer Spies Band of Stars · NASA · NASA — public domain

EntityQ1039436· pop 32· linked from 3 articles

galaxy

Astronomical data · SIMBAD

Object type
GiG
Redshift
z = 0.014329160693661747
Morphology
SBbc
Coordinates
RA 32.1856° · Dec 38.7771°
View on SIMBAD →

via SIMBAD · CDS Strasbourg

Key facts

Constellation
Andromeda
Right ascension
02 08 44.5464
Declination
+38 ° 46 ′ 37.596 ″
Redshift
0.014 156 ± 0.000 0130
Heliocentric radial velocity
4,244 ± 4 km/s
Distance
168.62 ± 8.37 Mly (51.700 ± 2.565 Mpc )
Group or cluster
[CHM2007] LDC 148
Type
SABc
Size
~171,700 ly (52.64 kpc ) (estimated)
Apparent size v
3.0′ × 1.3′

via Wikipedia infobox

~2 min read

Encyclopedic overview

NGC 818 is an intermediate spiral galaxy in the constellation of Andromeda. Its velocity with respect to the cosmic microwave background is 4,010±17 km/s, which corresponds to a Hubble distance of 192.9 ± 13.5 Mly (59.14 ± 4.15 Mpc). Additionally, 14 non-redshift measurements give a closer mean distance of 168.62 ± 8.37 Mly (51.700 ± 2.565 Mpc). It was discovered by German-British astronomer William Herschel on 18 October 1786.

NGC 818 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.

Excerpted from Wikipedia’s “NGC 818” article, available under the CC BY-SA 4.0 licence.