GM 1-29 - Gyulbudaghian's Nebula (Gary Imm)

GM 1-29 - Gyulbudaghian's Nebula

This object is a reflection nebula located 1100 light years away in the constellation of Cepheus at a declination of +68 degrees. The nebula is known by many names, including GM 1-29, Gyulbudaghian's Nebula, and Herbig-Haro object 215. The object was discovered in 1977 by Armen Gyulbudaghian, an Armenian astronomer. The pronunciation of the nebula looks intimidating but is actually quite simple: "ghool-bu-dah-ghee-an".

The nebula is about 0.5 light years long, emanating from the orange star which is the variable protostar PV Cephei. The molecular cloud PGCC G102.85+15.25 surrounds the star. This newborn star is firing out jets of gas in opposite polar directions. The visible portion of the gas jet on the top side of the object is breaking towards us through the cloud, while the rest of the jet is obscured by the cloud.

Of all of the DSOs I have imaged, this object changes most dramatically over short periods of time. It most often appears as a fan shape, although my image shows a bright long arc. I have attached an image (Revision L) which compares the original 1952 image, a 2015 image taken by the late Rick Johnson, and my 2020 image. Although there are brightness and color differences between these images, the nebula shape change is apparent. The shape change is likely due to the varying source starlight reflections off of the surrounding dusty cloud.

I am amazed that my 2020 image is so similar to the 1952 image. This seems extremely coincidental if these variations are simply due to random cloud movements. I will image this object again in a few years to see if it reverts back to a fan shape again.

Stars usually are birthed together in groups and this area is no exception. I have labelled some of the other HH objects in the vicinity in the Astrobin mouseover, although this object (HH 215) is by far the brightest of them.

Original
K
L

L

Description: Comparison over 70 years

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Status	Advanced success
Started	...
Astrometry.net job	3738294
PixInsight job	X16AVQYLIWE7KKSGTOGPUISB1ASSSNEQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h45m57s.994
RA (top/left)	20h47m41s.655
RA (top/right)	20h44m12s.336
RA (bottom/right)	20h44m15s.339
RA (bottom/left)	20h47m42s.705

Dec (center)	+67°58′16″.95
Dec (top/left)	+68°04′58″.57
Dec (top/right)	+68°04′41″.59
Dec (bottom/right)	+67°51′31″.32
Dec (bottom/left)	+67°51′47″.71

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