| NGC 1784 | |
|---|---|
 NGC 1784 by Legacy Surveys | |
| Observation data (J2000epoch) | |
| Constellation | Lepus |
| Right ascension | 05h 05m 27.1s[1] |
| Declination | −11° 52′ 17″[1] |
| Redshift | 0.007735 ± 0.000010[1] |
| Heliocentric radial velocity | 2,319 ± 3 km/s[1] |
| Distance | 79.4 ± 14.5Mly (24.3 ± 4.4Mpc)[1] |
| Apparent magnitude (V) | 11.7[2] |
| Characteristics | |
| Type | SB(r)c[1] |
| Apparent size (V) | 4.0′ × 2.5′[1] |
| Other designations | |
| MCG -2-13-42, IRAS 05030-1156,PGC 16716 | |
NGC 1784 is abarred spiral galaxy in the constellationLepus. The galaxy lies about 80 millionlight years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 1784 is approximately 100,000 light years across.[1] Its distance based on redshift is 102 Mly.[1] It was discovered byJohn Herschel on December 11, 1836.[3]
NGC 1784 has a strong bar with dust lanes and patches. Twospiral arms emerge from the end of the bar and form a nearly complete inner ring. The outer spiral arm of the galaxy consists of low-surface-brightness spiral fragments, which complete up to a quarter of revolution before fading.[4] These arms have many knots. Imaging in thehydrogen line shows the presence of a narrow but bright ring. The hydrogen ring is more prominent at the eastern side of the galaxy. Also, the hydrogen appears wrapped, indicative of aninteraction with another galaxy. The total hydrogen mass of the galaxy is estimated to be1.17×1010 M☉.[5][6]
Onesupernova has been discovered in NGC 1784, SN 2022xkq. The supernova was discovered on 13 October 2022, and it was classified as photometrically transitional and spectroscopically 91bg-liketype Ia supernova. These supernovae are characterised as underluminous and by fast-declining magnitude and are more common in older star populations. The supernova occurred in one of the spiral arms of the galaxy. An unusual feature of SN 2022xkq was its red excess.[7] The supernova was observed by theJames Webb Space Telescope in mid infrared.[8]
NGC 1784 is the foremost galaxy of the NGC 1784 Group, which also includes FGC 0523, and HIPASS J0508-13.[9]
