Hu 2-1
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Planetary nebula Hu 2-1 |
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Hercules |
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Position equinox : J2000.0 |
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| Right ascension | 18h 49m 47.55s |
| declination | + 20 ° 50 ′ 39.4 ″ |
| Appearance | |
| Central star | |
| Physical data | |
| history | |
| discovery | Milton Lasell Humason |
| Date of discovery | June 21, 1922 |
| Catalog names | |
| PK 051 + 09 1 • PN G051.4 + 09.6 • | |
Hu 2-1 is a planetary nebula in the constellation Hercules . He was discovered by Milton Lasell Humason in 1922. The main structure is a bipolar shell with a radius of about 0.9 ", which expands equatorially at 15 km / s, while the weaker bulges expand at about 30 km / s Years close, which is supported by low mass of the total nebula of less than 1% of the solar mass .
Web links
- Observing at Skyhound (English)
Individual evidence
- ↑ VizieR Detailed Page (English)
- ↑ ML Humason: A New Planetary Nebula , bibcode : 1922PASP ... 34..296H
- ↑ LF Miranda: The spatio-kinematical structure of the compact planetary nebula HU 2-1. , Astronomy and Astrophysics, v.304, p.531