Astronomical data · SIMBAD
- Object type
- GiP
- Redshift
- z = 0.0038601154900446133
- Morphology
- SAbc
- Coordinates
- RA 171.7967° · Dec 17.0302°
via SIMBAD · CDS Strasbourg
Key facts
- Constellation
- Leo
- Right ascension
- 11 27 11.2201
- Declination
- +17 ° 01 ′ 48.518 ″
- Redshift
- 0.003879 ± 0.000013
- Heliocentric radial velocity
- 1,163 ± 4 km/ s
- Distance
- 67.1 ± 14.8 Mly (20.6 ± 4.5 Mpc )
- Group or cluster
- Leo II Groups
- Type
- SA(rs)bc
- Size
- ~78,000 ly (23.9 kpc ) (estimated)
- Apparent size v
- 3.1 ′ × 2.1 ′
via Wikipedia infobox
~1 min read
Encyclopedic overview
NGC 3684 is a spiral galaxy in the constellation Leo. The galaxy lies about 70 million light years away from Earth, which means, given its apparent dimensions, that NGC 3684 is approximately 80,000 light years across. It was discovered by William Herschel on April 17, 1784.
The galaxy features a bar embedded in an elliptical bulge. From the end of the bar emerge two spiral arms in a grand design pattern. They are smooth although they both feature knots, especially the western one. The arms can be traced for about 300° before fading. There are many bright H-alpha sources near the centre and few HII regions in the arms. The galaxy has an excess of hydrogen. There is a low-surface-brightness outer spiral pattern.
Excerpted from Wikipedia’s “NGC 3684” article, available under the CC BY-SA 4.0 licence.
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