NGC 7129 (VdB 146) - Open Cluster associated with nebulosity and Herbig-Haro objects in Cepheus

LRGB combination (Click for a larger view 1100 x 1100 px)

Mouse over to see identifications of objects (see info below)


NGC 7129 (VdB 146) - Open Cluster associated with nebulosity and Herbig-Haro objects in Cepheus

Discovered by William Herschel in 1794.

NGC 7129 is a star-forming region that contains many interesting features. In this open star cluster and a lovely reflection nebula was estimated that many of the bright stars are younger than 1 million years! These stars are very energetic and emit plentiful amounts of radiation that break apart clouds of gas that surrounds them. A small number of very red structures indicate regions where new stars are forming. These regions of gas are catalogued as Herbig Haro (HH) objects. These objects take their name from George Herbig and Guillermo Haro who first described them over 50 years ago. HH objects are typically seen along the rotational axis of the star, and are a relatively brief cosmic light show, they only last a few thousand years. Here are shown HH103 and HH105. NGC 7129 contains several bright reflection nebulae including the large blue reflection cloud NGC 7133 and the unusual small yellow reflection cloud IC 5132 (LBN497). The dominant blue reflection nebula, is illuminated by two young B-type stars BD +65°1637 and BD +65°1638 and a LkHa 234. BD +65°1637 and LkHa 234 are known to be Ha emission objects (Harbig 1960) The stars are less than one million years old and represent the core of NGC 7129. There are several nebulous objects classified as GGD32 to 35 (Gyulbudaghian, Glushkov and Denisyuk (1978). RNO 138 is reflection nebula probably illuminated by SVS6 star.

Chart and brief adapted information by courtesy of P. Hartigan:
CCD images of suspected Herbig-Haro objects
Hartigan, P.; Lada, C. J.
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 59, Nov. 1985, p. 383-396


North is up. The Horizontal FOV is about 20' (significant crop from original FOV due to bad flat framing). The image almost centered at:

Right Ascension 21 : 41.3 (h:m)
Declination +66 : 06 (deg:m)
Distance 3.3 (kly)
Brightness 12 (mag)
Apparent Dimension

8 (arc min)

Seeing: Pickering 7 rating - Good
Optic(s): RC 12" with Astro-Physics corrector @ f/5
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik L, R, G, B set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-07-15
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L=60 min ( Bin 1) and R = 40 min, G = 40 min, B = 40 min (Bin 2), subs. 10 min, Total Exposure Time - 180 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided

PixInsight / PS


All Contents copyright Velimir Popov unless otherwise noted.