NGC 2438
| NGC 2438 | |
|---|---|
|
NGC 2438 and the Calabash Nebula | |
| Observation data (Epoch J2000.0) | |
| Right ascension | 07h 41.8m |
| Declination | -14° 44′ |
| Distance | 2,900 ly |
| Apparent magnitude (V) | +10.8 |
| Apparent dimensions (V) | 1.1 arcmins |
| Constellation | Puppis |
| Physical characteristics | |
| Radius | - |
| Absolute magnitude (V) | - |
| Notable features |
Superimposed on Messier 46 |
| Other designations | H IV.39, FC 87, PK 231+4.2 |
NGC 2438 is a planetary nebula about 3,000 light years away in the constellation Puppis.[1] It was discovered by William Herschel on March 19, 1786.[2] The planetary nebula NGC 2438 appears to lie within the cluster M46, but it is most likely unrelated since it does not share the cluster's radial velocity.[3][4] The case is yet another example of a superposed pair, joining the famed case of NGC 2818.[3][5]
Long exposures have shown that this planetary nebula has an extended halo,[6] while the more easily visible portion probably dates to the death of the red giant in its center.[2]
Central star
The central star of this planetary nebula is a 17.7-magnitude white dwarf,[2] with surface temperature of about 75,000 K (74,700 °C).[7] It is one of the hottest stars known.
See also
References
- ↑ "Astronomy Picture of the Day, Planetary Nebula NGC 2438". NASA. 2011-04-07. Retrieved 2011-04-08.
- 1 2 3 "NGC Objects: NGC 2400 - 2449". Retrieved 2011-04-08.
- 1 2 Majaess D. J., Turner D., Lane D. (2007). In Search of Possible Associations between Planetary Nebulae and Open Clusters, PASP, 119, 1349
- ↑ Kiss, L. L., Szabó, Gy. M., Balog, Z., Parker, Q. A., Frew, D. J. (2008). AAOmega radial velocities rule out current membership of the planetary nebula NGC 2438 in the open cluster M46, MNRAS
- ↑ Mermilliod, J.-C., Clariá, J. J., Andersen, J., Piatti, A. E., Mayor, M. (2001). Red giants in open clusters. IX. NGC 2324, 2818, 3960 and 6259, A&A
- ↑ "NGC 2438". SEDS. Retrieved 2011-04-08.
- ↑ "Planetary Nebula NGC 2438 in Puppis". Retrieved 2011-04-08.
External links
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Coordinates: 
07h 41m 50.6s, −14° 44′ 05″
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