Galaxy Evolution Explorer Spies Band of Stars · NASA · NASA — public domain
Astronomical data · SIMBAD
- Object type
- GiG
- Redshift
- z = 0.014329160693661747
- Morphology
- SBbc
- Coordinates
- RA 32.1856° · Dec 38.7771°
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.