- O120 minutes (12 frames)
- S100 minutes (10 frames)
- H150 minutes (15 frames)
The Cave Nebula (Sh2-155) is a dim and diffuse emission nebula located in the constellation Cepheus, approximately 2,400 light-years from the Sun. It is part of a larger complex of emission, reflection, and dark nebulae that occupies an area roughly three times the size of the full Moon.
Structure and Origin
Sh2-155 is located at the edge of a massive molecular cloud and an association of young, hot stars.
- The bright rim of the nebula is composed of ionized interstellar gas that glows when exposed to ultraviolet radiation from the stars.
- Ionization fronts caused by this radiation exert pressure on the surrounding material, which can compress the clouds and initiate star formation.
Size and Role in Star Formation
The cosmic "cave" has a diameter of about 10 light years, which makes it a suitable place for the formation of new stars. These stellar nurseries are an example of how the interaction between stars and molecular clouds affects the processes of star formation.
Observations
Despite the weak brightness, the nebula attracts the attention of astronomers and astrophotographers:
- The complex of diverse structures allows us to study the interaction between different types of nebulae.
- The use of narrow-band filters greatly facilitates the observation of the emission part of this region.
Sh2-155, or the Cave Nebula, remains an important object for studying the processes of star formation and the interaction of stellar radiation with the interstellar medium, providing a unique opportunity to look into the "workshop" of the Universe.
| Photo | Date | Frames | Exposure | H |
|---|---|---|---|---|
 | 27 Jan 2021 | 15 | 02:30 | 02:30 |
Visibility chart of Cave Nebula (Sh2-155) 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•