| NGC 5364 | |
|---|---|
 NGC 5364 imaged with the 24-inch telescope atMount Lemmon Observatory | |
| Observation data (J2000epoch) | |
| Constellation | Virgo |
| Right ascension | 13h 56m 12.004s[1] |
| Declination | +05° 00′ 52.06″[1] |
| Redshift | 0.004228[2] |
| Heliocentric radial velocity | 1267 ± 2 km/s[2] |
| Distance | 54.5 ± 3.9Mly(16.7 ± 1.2Mpc)[3] |
| Group orcluster | NGC 5364 Group (LGG 362) |
| Apparent magnitude (V) | 11.2[2] |
| Characteristics | |
| Type | SA(rs)bc pec[4] |
| Size | ~110,700 ly (33.94 kpc) (estimated)[2] |
| Apparent size (V) | 6.1′ × 6.8′[5] |
| Other designations | |
| HOLM 557A,IRAS 13536+0515,NGC 5317,UGC 8853,MCG +01-36-003,PGC 49555,CGCG 046-009[6][2] | |
NGC 5364 is agrand design spiral galaxy located 54.5[3] millionlight years away in theconstellationVirgo. It isinclined to theline of sight from the Earth at an angle of 47° along aposition angle of 25°.[7] It is a member of theNGC 5364 Group of galaxies (also known asLGG 362), itself one of theVirgo III Groups strung out to the east of theVirgo Supercluster of galaxies.[8] The galaxies NGC 5364 andNGC 5360 are also listed together asHolm 557 inErik Holmberg'sA Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[9]
Themorphological classification of NGC 5364 in theDe Vaucouleurs system is SA(rs)bc pec,[4] which indicates it has an incomplete ring structure (rs) in the inner part of the galaxy with moderate to loosely wound arms (bc) and has a peculiar aspect (pec).[5] In particular, the appearance of the spiral arms is amorphous and asymmetrical compared to other galaxies with a similar classification.[4] A companion galaxy,NGC 5363, is located to the north of NGC 5364 and their gravitational interaction may be influencing the peculiar morphology of the latter.[3]
The mid-infrared emission in the nucleus appears weak compared to the spiral arms, suggesting a low rate of star formation in the core region.[4] The inner ring of this galaxy spans a diameter of 22 kly (6.7 kpc) and is located slightly off center with the northern side showing a stronger emission in thehydrogen alpha band compared to the southern half. MultipleH II regions lie along the spiral arms, tracing out their extent.[3] Each of the two main arms wrap all the way around the galaxy, although they display patchiness along much of their length.[5]
This object was discovered byWilliam Herschel on February 2, 1786, and later listed as NGC 5364. It was subsequently rediscovered byJohn Herschel on April 7, 1828, and later listed as NGC 5317.[10]
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