Sh2-239 & LDN 1551 (Gary Imm)

Sh2-239 & LDN 1551

This is an image of an HII region (Sh2-239) and a dark nebula (LDN 1551), both located 500 light years away in the constellation of Taurus. The dark nebula spans about 3 light-years. The highlight of the image to me is the many red and yellow jet outflows from Herbig-Haro objects. I have included an annotated image to assist with the description below.

This nebula is a star factory. Many young stellar objects are forming within the nebula. 11 of the brighter Herbig-Haro (HH) objects are labeled in the annotated image. Many of these objects are red due to ionized hydrogen gas, which is their typical color, but quite a bit of yellow is also seen in the image. I assume that the yellow color is due to the reflection of star color in the nebula.

I find it fascinating that the outflow jet patterns of some of these objects have changed in recent years. A comparison of my image with detailed images from 10 years ago show that the outflows are now oriented in slightly different ways, especially for the objects labeled HL Tau and NE.

I enjoyed this quote from Jason Major of Universe Today about this object - "Like very young humans, very young stars also tend to make a big mess out of the stuff around them — except in the case of stars it’s not crayon on the walls and Legos on the floor, but rather huge blasts of superheated material that are launched from their poles far out into space. HH 151 is embedded within the larger star-forming region LDN 1551, a stellar nursery full of dust, dark nebulae, newborn stars. (Hey, if baby stars are going to make a mess at least they can do it in the nursery!)

Final
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Sharpless2 Objects
ZWO ASI183/QHY183
The refractors!
Cloudy Nights
Takahashi Refractors

Dark Nebulae
Herbig-Haro Objects
LDN Catalog
Sharpless Catalog (200/313)
Small Packages Catalog (Complete)

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Status	Advanced success
Started	...
Astrometry.net job	3093009
PixInsight job	IL54KHP4JBCWAYZC15MMY8V6P908OKSL
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	04h31m21s.228
RA (top/left)	04h32m48s.440
RA (top/right)	04h30m31s.994
RA (bottom/right)	04h29m54s.544
RA (bottom/left)	04h32m10s.272

Dec (center)	+18°06′36″.62
Dec (top/left)	+18°14′19″.10
Dec (top/right)	+18°25′15″.77
Dec (bottom/right)	+17°58′51″.66
Dec (bottom/left)	+17°47′56″.58

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Sh2-239 & LDN 1551

Sh2-239 & LDN 1551

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Sh2-239 & LDN 1551

Sh2-239 & LDN 1551

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