Pismis 20 | |
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Observation data ( J2000 epoch) | |
Right ascension | 15h 15m 23.0s [1] |
Declination | −59° 04′ 00″ [1] |
Distance | 3,270 pc |
Physical characteristics | |
Estimated age | 5×106 years |
Other designations | VDBH 170, MWSC 2281, C 1511-588, OCl 932 |
Associations | |
Constellation | Circinus |
Pismis 20 is a compact open cluster in Circinus. It is located at the heart of the Circinus OB1 association in the Norma arm of the Milky Way Galaxy. [2] Pismis 20 is about 3,270 pc away and only about 5 million years old. HD 134959, a blue supergiant variable star also called CX Circinus, is the brightest star in Pismis 20. [3]
Star name | MV number | Effective temperature | Absolute magnitude | Bolometric magnitude | Mass ( M☉) | Spectral type | Ref. |
---|---|---|---|---|---|---|---|
WR 67 | 11 | 56000 | -4.03 | -8 | 9 | WN6-w | [4] |
CX Circinus (HD 134959) | 1 | 20900 | -7.9 | -9.8 | 50 | B2.5Ia | [5] |
6 | 42600 | -4.2 | -8.2 | 34 | B | [5] | |
2 | 34400 | -5.4 | -8.8 | 34 | O8.5I | [5] | |
3 | 28800 | -5.5 | -8.4 | 26 | B0I | [5] | |
7 | 30200 | -5 | -8 | 23 | B0III | [5] | |
4 | 29500 | -5 | -7.9 | 23 | B0.2III | [5] | |
5 | 30200 | -4.5 | -7.5 | 20 | B0III | [5] |
Pismis 20 | |
---|---|
![]() | |
Observation data ( J2000 epoch) | |
Right ascension | 15h 15m 23.0s [1] |
Declination | −59° 04′ 00″ [1] |
Distance | 3,270 pc |
Physical characteristics | |
Estimated age | 5×106 years |
Other designations | VDBH 170, MWSC 2281, C 1511-588, OCl 932 |
Associations | |
Constellation | Circinus |
Pismis 20 is a compact open cluster in Circinus. It is located at the heart of the Circinus OB1 association in the Norma arm of the Milky Way Galaxy. [2] Pismis 20 is about 3,270 pc away and only about 5 million years old. HD 134959, a blue supergiant variable star also called CX Circinus, is the brightest star in Pismis 20. [3]
Star name | MV number | Effective temperature | Absolute magnitude | Bolometric magnitude | Mass ( M☉) | Spectral type | Ref. |
---|---|---|---|---|---|---|---|
WR 67 | 11 | 56000 | -4.03 | -8 | 9 | WN6-w | [4] |
CX Circinus (HD 134959) | 1 | 20900 | -7.9 | -9.8 | 50 | B2.5Ia | [5] |
6 | 42600 | -4.2 | -8.2 | 34 | B | [5] | |
2 | 34400 | -5.4 | -8.8 | 34 | O8.5I | [5] | |
3 | 28800 | -5.5 | -8.4 | 26 | B0I | [5] | |
7 | 30200 | -5 | -8 | 23 | B0III | [5] | |
4 | 29500 | -5 | -7.9 | 23 | B0.2III | [5] | |
5 | 30200 | -4.5 | -7.5 | 20 | B0III | [5] |