| NGC 1466 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Hydrus |
| Right ascension | 03h44m33s[1] |
| Declination | −71° 40′ 17″[1] |
| Distance | 48.5 kpc (158 kly)[2] |
| Apparent magnitude (V) | 11.4[3] |
| Apparent dimensions (V) | 3.50′[1] |
| Physical characteristics | |
| Mass | 1.4×105[4] M☉ |
| Metallicity | ![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c) = −1.60[5] dex |
| Estimated age | 13.1[6] Gyr |
| Other designations | SL1, LW1, ESO54SC16, KMHK1,[1] PGC 2802621 |
| See also: Globular cluster, List of globular clusters | |
NGC 1466 is the New General Catalogue designation for a globular cluster in the deep southern constellationofHydrus. It is located in the outskirts of the Large Magellanic Cloud,[5] which is a satellite galaxy of the Milky Way. The object was discovered November 26, 1834 by English astronomer John Herschel.[7] John Dreyer described it as "pF, pS, iR, glbM, *7 f", meaning "pretty faint, pretty small, irregular round, gradually a little brighter middle, with a 7th magnitude star nearby".[8] When using a small telescope, this is a "faint, small, unresolved and difficult" target with an angular size of 1.9 arc minutes. It has an integrated visual magnitude of 11.4.[3]
This cluster has a reddening corrected distance modulusof18.43±0.15,[5] corresponding to a distance of 48.5 kpc.[2] The cluster has a mass of about 140,000 times the mass of the Sun.[4] It is an old cluster, having an estimated age of 13.1 billion years.[5] In photographs, the cluster spans an apparent size of 3.50 arc minutes.[1] The core radius has an angular size of 10.7±0.4 arc seconds,[5] while the half-light radius is 24.3 arc seconds.[4]
There are a total of 49 known and one candidate RR Lyrae variable stars in the cluster, as of 2011. Eight are RRd, or double-mode RR Lyrae variables. The average periods are 0.591 days for RR Lyrae type ab and 0.335 days for RR Lyrae type c. These are consistent with a classification of Oosterhoff-intermediate for the cluster. Twelve other variables have been identified, including two long-period variables and a Cepheid variable.[5]
Media related to NGC 1466 at Wikimedia Commons|
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