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Open cluster in the constellation Tucana From Wikipedia, the free encyclopedia
NGC 152 is an open cluster in the constellation Tucana. It was discovered by John Herschel on September 20, 1835.[5] It is located within the Small Magellanic Cloud.[1]
| NGC 152 | |
|---|---|
NGC 152 as seen from the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Right ascension | 00h 32m 56.26s[1] |
| Declination | −73° 06′ 56.6″[1] |
| Apparent magnitude (V) | 12.26[1] |
| Apparent dimensions (V) | 3.00′ × 3.00′[2] |
| Physical characteristics | |
| Mass | 2.5×104[3] M☉ |
| Estimated age | 1.40±0.20 Gyr[3] |
| Other designations | ESO 28-24[4] |
| Associations | |
| Constellation | Tucana |
NGC 152 is about 1.40 billion years old. Its estimated mass is 2.5×104 M☉, and its total luminosity is 8.0×104 L☉, leading to a mass-to-luminosity ratio of 0.31 M☉/L☉.[3] All else equal, older star clusters have a lower luminosity for the same mass; that is, their mass-to-luminosity ratios are higher.[3]
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