IC 4634
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Planetary Nebula IC 4634 |
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| Image of the Hubble space telescope with line filter . | |
| AladinLite | |
| Constellation | Snake bearer |
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Position equinox : J2000.0 |
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| Right ascension | 17h 01m 33.6s |
| declination | -21 ° 49 ′ 33 ″ |
| Appearance | |
| Apparent brightness (visual) | 10.9 likes |
| Apparent brightness (B-band) | 10.7 mag |
| Angular expansion | 0.4 |
| Central star | |
| designation | HD 153655 |
| Physical data | |
| distance | 7,500 ly |
| history | |
| discovery | Williamina Fleming |
| Date of discovery | 1894 |
| Catalog names | |
| IC 4634 • PK 000 + 12 1 • PN G000.3 + 12.2 • ESO 587-1 • Hen 2-189 | |
IC 4634 is a planetary nebula in the constellation Ophiuchus the celestial equator , an estimated 7,500 light-years from the sun away. It has a point-symmetrical, S-shaped structure, in which its inner shell expands at 20 km / s. The inner shell shows an intense H-alpha emission, while the S-shaped bands show an NII emission line.
The object was discovered in 1894 by the American astronomer Williamina Fleming .
Web links
- astronews.com: Picture of the day May 18, 2012
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ^ SEDS : IC 5017
- ^ Martin A. Guerrero, Luis F. Miranda, You-Hua Chu: Multiple Point-Symmetric Ejections in IC 4634 , arxiv : astro-ph / 0310370
- ↑ O. Toledano et al .: A Detailed Kinematical Study of the Point-Symmetric Planetary Nebula IC4634 , bibcode : 2003IAUS..209..543T .