| Emission nebula | |
|---|---|
| Planetary nebula | |
 | |
| Observation data: J2000 epoch | |
| Right ascension | 15h37m 11.2s[1] |
| Declination | −71° 54′ 52.9″[1] |
| Distance | 2200[2] pc |
| Apparent magnitude (V) | 10.47[1] |
| Constellation | Apus |
| Physical characteristics | |
| Absolute magnitude (V) | - |
| Notable features | - |
| See also: Lists of nebulae | |
Hen 2-131 is a planetary nebula in the southern constellation of Apus. It was discovered by Andrew David Thackeray in 1950[3] and added to the Catalogues of Hα-emission Stars and Nebulae in the Magellanic CloudsbyKarl Gordon Henize in 1967.[4]
Hen 2-131 is about 2,200 pc from earth.[2] HD 138403 is the star located in the center of Hen 2–131 with a spectral type of O8(f)ep.[5] The nebula expands at a speed of 11.5 km/s, and the temperature of HD 138403 is about 34,000 K. HD 138403 is suspected of variability, possibly by 0.1 to 0.15 magnitudes over a period of several hours. This nebula is similar to IC 418, IC 4593 and Hen 2-138.[6]
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