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 | |
---|---|
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]