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Sh 2-170

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Little Rosette Nebula
Emission nebula
H II region
Sh2-170 as seen by the Hubble Space Telescope
Observation data: epoch
Right ascension00h 01m 29s
Declination+64° 39' 03"
Distance7,500[1] ly
Apparent magnitude (V)~6.5
Apparent dimensions (V)56' x 50'[2]
ConstellationCassiopeia
DesignationsLBN 577, Sh 2-170,[3] LBN 117.62+02.29 [4]
See also: Lists of nebulae

Sharpless 2-170, Also known by the common name the Little Rosette Nebula is an emission nebula in the constellation Cassiopeia.[5]

It was discovered by Stewart Sharpless in the late 1950s, and its discovery published in 1959. It is named after the larger, much more well known Rosette Nebula.[4] It is located in the Perseus arm of the Milky Way. Although being a separate nebula, it is considered as the dot in the Question Mark Nebula, as an extension of NGC 7822.

The nebula contains a central star cluster, Stock 18.[6] Stock 18, has an apparent size much smaller than the nebula's total of 56 x 50 arcminutes, with the cluster having an apparent size of just 18 arcminutes.[7] Some of its illumination is caused by the ionizing of gas by the star BD + 63 2093, also designated LS I +64 11.[8] There is dispute between studies as to the nature of said central star. A 1995 paper concluded the star was a O8 V type, however other papers have identified it as a O9 V type, and SIMBAD labels it as a G5 star.[9] The nebula contains a total of 71 variable stars.[10]

Visibility

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Sh 2-170 has a magnitude of about 6.5. It is best viewed with a hydrogen-alpha filter. Most of the nebula is faint enough that it requires a longer exposure time to be visible to cameras.[11]

See also

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References

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  1. ^ "Sh2-170 - The Little Rosette Nebula". AAPOD2.COM. Retrieved 2025-09-08.
  2. ^ "SH2-170". www.simg.de. Retrieved 2025-09-08.
  3. ^ Cosgrove, Patrick A. (November 19, 2021). "SH2-170, The "Little Rosette" Nebula in SHO - 7 hours". Cosgrove's Cosmos. Retrieved 2025-09-08.
  4. ^ a b "Little Rosette Nebula (Sh 2-170) | Deep⋆Sky Corner". www.deepskycorner.ch. Retrieved 2025-09-08.
  5. ^ "Sh2-170 · Baerenstein Observatory". Sternwarte Bärenstein. Retrieved 2025-09-08.
  6. ^ Brecher, Ron (November 22, 2014). "Sh2-170 Emission Nebula". Astrodoc: Astrophotography by Ron Brecher. Retrieved 2025-09-08.
  7. ^ Bhatt, Himali; Sagar, Ram; Pandey, J.C. (February 2012). "Stellar contents and star formation in the young cluster Stock 18". New Astronomy. 17 (2): 160–166. arXiv:1108.3407. Bibcode:2012NewA...17..160B. doi:10.1016/j.newast.2011.07.015.
  8. ^ "Sh2-170 in Cassiopeia". www.irida-observatory.org. Retrieved 2025-09-08.
  9. ^ "Sh 2-170". galaxymap.org. Retrieved 2025-09-08.
  10. ^ Sinha, Tirthendu; Sharma, Saurabh; Pandey, A. K.; Yadav, R. K.; Ogura, K.; Matsunaga, N.; Kobayashi, N.; Bisht, P. S.; Pandey, R.; Ghosh, A. (2020). "Variable stars in the Sh 2-170 H ii region". Monthly Notices of the Royal Astronomical Society. 493: 267–287. arXiv:2001.08892. doi:10.1093/mnras/staa206.
  11. ^ "SH2-170 (Sharpless 170)". www.sharplesscatalog.com. Retrieved 2025-09-08.