Sh 2-88

Sharpless 2-88
Diffuse nebula
Sh2-88 Nebula from the Mount Lemmon SkyCenter Schulman Telescope
Observation data: Epoch J2000 epoch
SubtypeReflection/Emission[2]
Right ascension19h 45m 59s[1]
Declination25° 20' 00"[1]
Distance6,523 ly   (2400[3] pc)
Apparent dimensions (V)47 light years across
ConstellationVulpecula
Physical characteristics
Radius345 ly
Absolute magnitude (V)--
DesignationsLBN 139, The Face of God Nebula
See also: Lists of nebulae

Sharpless 2-88 or Sh 2-88 is a region including the diffuse nebula Sh 2-88A and the two compact knots Sh 2-88B1 and Sh 2-88B2, all of which are associated with Vulpecula OB1.

Sh 2-88A is an HII-type diffuse nebula excited by the type O8 star BD+25°3952.[4] Both neutral and ionized gases in Sh 2-88 are between 150 and 410 solar masses and the dust mass is about 2 to 9 solar masses. The structure been interacting with a HI interstellar bubble shaped by the stellar winds of BD+25°3952 and the blue O8.5II(f) star BD +25°3866. Overall, its actual structure is located 2.4 kiloparsecs away, at 23 × 15 parsecs in radius. It has a dynamical age of 1.5 million years, and a mass of 1,300 solar masses. It has an rms electron density of 9 cm−3. All separate star forming regions are 1 arcminute in diameter.[5]

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