NGC 3184 as observed with the Spitzer Space Telescope, as part of the Spitzer Infrared Nearby Galaxy Survey. The blue colors represent the 3.6 micrometre emission from stars. The green and red colors represent the 5.8 and 8.0 micrometre emission from polycyclic aromatic hydrocarbons and possibly dustright
[clarification needed].
Observation data (J2000 epoch)
Constellation
Ursa Major
Right ascension
10h 18m 17.0s[1]
Declination
+41° 25′ 28″[1]
Redshift
0.001975[1]
Heliocentric radial velocity
592 ± 1 km/s[1]
Distance
39.8 ± 12 Mly (12.2 ± 3.7 Mpc)[2]
Apparent magnitude (V)
10.4[1]
Characteristics
Type
SA(s)b: II
Apparent size (V)
7.4′ × 6.9′
Other designations
UGC 5557, PGC 30087
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NGC 3184, the Little Pinwheel Galaxy, is a spiral galaxy approximately 40 million light-years away[2] in the constellation Ursa Major. Its name comes from its resemblance to the Pinwheel Galaxy. It has two HII regions named NGC 3180[3] and NGC 3181.[4]
NGC 3184 houses a high abundance of heavy elements and SN 1999gi, a magnitude 14 Type II supernova detected on December 9, 1999.[5][6] Other supernovae in NGC 3184 include 1921B (mag 13.5), 1921C (mag 11) and 1937F (mag 13.5).[6]
The blue color of its spiral arms comes mostly from relatively few bright young blue stars. The bright stars that highlight the arms were created in huge density waves that circle the center.
^ abcde"NASA/IPAC Extragalactic Database". Results for NGC 3184. Retrieved 2010-06-01.
^ ab"Distance Results for NGC 3184". NASA/IPAC Extragalactic Database. Retrieved 2010-06-01.
^"NASA/IPAC Extragalactic Database". Results for NGC 3180. Retrieved 2010-06-02.
^"NASA/IPAC Extragalactic Database". Results for NGC 3181. Retrieved 2010-06-02.
^Daniel W. E. Green (1999-12-10). "Supernova 1999gi in NGC 3184 (Circular No. 7329)". Central Bureau for Astronomical Telegrams. Retrieved 2010-06-02.
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