- O160 minutes (16 frames)
- S150 minutes (15 frames)
- H200 minutes (20 frames)
Sh2-168 is a small emission nebula, about 9.5 light-years in diameter, located in the constellation Cassiopeia at a distance of 11,655 light-years from the Sun.
The Central Star and Its Influence
The nebula owes its existence to a hot blue star of spectral type O9V, which lies in the central region.
- The radiation from the star creates a powerful stellar wind, blowing out a huge cosmic bubble from the surrounding material.
- Gas and dust clouds: the dark regions inside the nebula are dense accumulations of gas and dust. If not for the strong influence of the stellar wind, these clouds could serve as a basis for the formation of new star systems in the future.
Observations
Sh2-168 is extremely dim, so it can only be seen in images taken using:
-
Monochrome cameras.
-
Narrowband filters, which allow you to isolate specific wavelengths emitted by ionized hydrogen.
Scientific significance
The Sh2-168 nebula is an example of the impact of a massive star on the surrounding interstellar medium. Studying such objects helps astronomers better understand:
-
Gas ionization processes.
-
The dynamics of the formation of cosmic bubbles under the influence of stellar wind.
-
The role of O-class stars in the evolution of stellar systems.
Sh2-168 continues to attract the attention of astrophotographers and scientists due to its unique structural features and interaction with the surrounding space.
| Photo | Date | Frames | Exposure | H | O | S |
|---|---|---|---|---|---|---|
 | 29 Jan 2021 | 51 | 08:30 | 03:20 | 02:40 | 02:30 |
 | 20 Jan 2021 | 51 | 08:30 | 03:20 | 02:40 | 02:30 |
Visibility chart of Emission Nebula (Sh2-168) during the day
| Date | Moon Phase | Exposure | CCD Temperature | Gain | Offset | Filter |
|---|---|---|---|---|---|---|
- 2023ixf•
- 40 Eri•
- Abell 74•
- Artemis A868 SA•
- a Canis Minoris•
- C 2020 R4 ATLAS•
- C 2020 T2 Palomar•
- C 2021 S3 (PANSTARRS)•
- Haumea (2003 EL61)•
- HCG 68•
- HCG 92•
- IC 1318B•
- IC 1396•
- IC 1795•
- IC 1805•
- IC 1848•
- IC 1871•
- IC 3322A•
- IC 342•
- IC 4015•
- IC 405•
- IC 417•
- IC 434•
- IC 443•
- IC 4703•
- IC 5070•
- IC 5146•
- IC 63•
- M 1•
- M 101•
- M 103•
- M 109•
- M 13•
- M 15•
- M 27•
- M 3•
- M 33•
- M 42•
- M 45•
- M 5•
- M 51•
- M 57•
- M 63•
- M 64•
- M 74•
- M 76•
- M 81•
- M 82•
- M 86•
- M 87•
- M 94•
- M 97•
- NGC 147•
- NGC 1491•
- NGC 1499•
- NGC 1579•
- NGC 1961•
- NGC 2146•
- NGC 2239•
- NGC 2403•
- NGC 281•
- NGC 4236•
- NGC 4565•
- NGC 4631•
- NGC 507•
- NGC 508•
- NGC 5866•
- NGC 5907•
- NGC 6503•
- NGC 6823•
- NGC 6888•
- NGC 6946•
- NGC 6992•
- NGC 6995•
- NGC 7000•
- NGC 7023•
- NGC 7129•
- NGC 7217•
- NGC 7331•
- NGC 7380•
- NGC 7538•
- NGC 7635•
- NGC 7640•
- NGC 7822•
- NGC 891•
- NGC 896•
- NGC 925•
- PGC 54559•
- Sh2-155•
- Sh2-168•
- Sh2 103•
- Sh2 109•
- Sh2 132•
- T CrB•
- UGC 6930•
- V1405 Cas•
- Vesta A807 FA•