Loading AI tools
Galaxy in the constellation Ursa Major From Wikipedia, the free encyclopedia
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 was discovered on 18 March 1787 by German-British astronomer William Herschel.[3] It has two HII regions named NGC 3180[4] and NGC 3181.[5]
| NGC 3184 | |
|---|---|
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 | |
NGC 3184 houses a high abundance of heavy elements. 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.
NGC 3184 has two prominent spiral arms. They have constant pitch angles, which makes them both symmetrical.[6]
Seven supernovae and astronomical transients have been observed in NGC 3184: SN 1921B (type unknown, mag. 13.5),[7] 1921C (type unknown, mag. 11),[8] SN 1937F (type unknown, mag. 13.5),[9] SN 1999gi (type II, mag. 14),[10][11][12] SN 2010dn (type ILRT, mag. 17),[13] SN 2016bkv (type II, mag. 17.2),[14] and AT 2019sfe (type unknown, mag. 20.6).[15][16]
On May 31, 2010, Kōichi Itagaki detected a magnitude 17 optical transient 33" east and 61" north of the center of NGC 3184 at coordinates 10 18 19.89 +41 26 28.8.[17] Designated SN 2010dn, this event was initially thought to be an outbursting luminous blue variable (LBV) star,[18] but later analysis categorized it as an intermediate-luminosity red transient (ILRT), also known as a luminous red nova.[19][20] Archival Hubble and Spitzer images of NGC 3184 seem to show no progenitor for optical transient SN 2010dn.[21] SN 2010dn is just like SN 2008S and NGC 300-OT.[18] On day 2, SN 2010dn had an unfiltered magnitude of 17.1, corresponding to a peak absolute magnitude of roughly -13.3.[18]
| Name | apmag | type |
|---|---|---|
| SN 1921B | 13.5 | ? |
| SN 1921C | 11.0 | ? |
| SN 1937F | 13.5 | ? |
| SN 1999gi | 14.0 | II |
| SN 2010dn | 17.2 | ILRT |
| SN 2016bkv | 17.2 | II |
| AT 2019sfe | 20.6 | ? |
| Galaxy | number | Declination |
|---|---|---|
| Arp 299 (NGC 3690 + IC 694) | 14 | +58 |
| NGC 6946 (Fireworks) | 10 | +60 |
| Messier 61 | 8 | +04 |
| Messier 100 | 7 | +15 |
| NGC 3184 | 7 | +41 |
| Messier 83 (Southern Pinwheel) | 6 | −29 |
| NGC 2207 and IC 2163 | 6 | −21 |
| NGC 2276 | 6 | +85 |
| Messier 66 | 5 | +12 |
| Messier 101 (Pinwheel) | 5 | +54 |
| NGC 309 | 5 | −09 |
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
