Large Magellanic Cloud

Bar – Chart 1

A multitude of objects buried in the Cloud’s shimmering bar

Location of Bar Chart 1

LH OB Associations: LH 16, 17, 20, 27, 30

NGC Objects: NGC 1804, 1825, 1834, 1836, 1839, 1847

Bar Chart 1

NGC 1804 (Open Cluster)

RA 05 01 04.5   Dec -69 05 03   Mag 11.9   Size 0.9′ x 0.8′

16″ at 228x: NGC 1804 appears as a pretty bright, irregular and almost triangular, knot of stars, 25″ in diameter, with four mag 12-14.5 stars easily resolved on its edges.

NGC 1804

SL 180 (Open Cluster)

RA 05 01 35.2   Dec -69 02 19   Mag 13.5   Size 1.4′

16″ at 228x: This cluster appears as a faint, soft, round glow of unresolved stars, ~20″ in diameter.

SL 180

SL 181 (Open Cluster)

RA 05 01 50.6   Dec -68 12 57   Mag 13.2   Size 1.2′ x 1.1′

16″ at 228x: SL 181 appears as a very faint, round smudge of unresolved stars, ~20″ in diameter.

SL 181

SL 188 (Open Cluster)

RA 05 02 35.0   Dec -69 49 20   Mag 12.4   Size 1.1′ x 1.0′

16″ at 228x: SL 188 appears as a fairly bright, round glow, ~15″ in diameter; no stars resolved.

SL 118

LH 16 + SL 191 (OB Association + Open Cluster)

RA 05 03 06   Dec -69 01 54   Size 3ʹ x 1.5ʹ

16″ at 228x: Exquisite! The association’s heart is mag 12.2 SL 191, a delicate and bright little off-round glow, ~20″ in diameter, with no stars resolved. It is beautifully framed within 5 mag 12.5-13 stars, and it’s all immersed in an oval-ish hazy glow of unresolved stars. It looks like a delicately crafted diamond brooch.

LH 16 + SL 191

LH 17 (OB Association)

RA 05 03 49   Dec -69 05 42   Size 2ʹ x 1ʹ

16″ at 228x: LH 17 is a delicate and graceful little object. It consists of three ~13th mag stars in a triangle immersed in the faint haze of unresolved stars, with a few tiny pinprick stars scattered around. The haze of unresolved stars is definitely brighter on the western side of the triangle, where there is a very small but relatively bright smudge of stars which contains the (unseen) cluster KMK88 3 and a couple of ~mag 15 stars. The NW vertex star has a very small, close companion to its east and some unresolved starlight that renders it smudgy. 

LH 17

LH 20 (OB Association)

RA 05 04 18   Dec -69 00 42   Size 4ʹ

16″ at 228x: LH 20 is like one of those stereograms – all you can see are the heaps of field stars filling the FOV, and then all of a sudden you can see the more starry and definitely hazier round patch that comprises the association! Once you have it in view, it appears quite defined and stands out relatively well! Three small stars lie on the south-eastern end.

LH 20

NGC 1825 (Open Cluster)

RA 05 04 18.8   Dec -68 55 42   Mag 12.0   Size 1.0′ x 0.9′

16″ at 228x: NGC 1825 appears as a fairly bright, round, even glow, 20″ in diameter. No stars are resolved. It lies 3.5′ WSW of lovely bright mag 8.1 HD 33477.

NGC 1825

NGC 1834 (Young Globular Cluster)

RA 05 05 11.2   Dec -69 12 02   Mag 11.8   Size 0.9′   Age –

16″ at 228x: This small young globular cluster appears as a  bright, round, smooth and even glow, ~20″ in diameter. No stars are resolved. It makes a nice pair with the white mag 9.3 HD 33487 that lies 2.8′ SE (there is something very attractive to my eye about a small bright hazy glow and the bright spark of a star lying close by each other).

NGC 1834

HS 107 (Open Cluster)

RA 05 05 18.3   Dec -68 44 14   Mag –   Size 1.1ʹ x 0.9ʹ

16″ at 228x: HS 107 appears as an exceedingly faint and exceedingly small, round, barely-there glow; just managing to stand out against the bar’s bright starry background.

HS 107

HS 112 (Open Cluster)

RA 05 05 32.5   Dec -69 06 59   Mag –   Size 0.9ʹ x 0.7ʹ

16″ at 228x: HS 112 appears as an exceedingly faint and exceedingly small, round, barely-there glow against the bar’s bright shimmer.

HS 112

NGC 1836  (Open Cluster)

RA 05 05 35.8   Dec -68 37 45   Size 1.5′   Sep 48″

16″ at 228x: NGC 1836 appears as a bright, oddly shaped cluster. It is elongated NW-SE ~1′ with a decidedly round and bulbous NW end that appears as an unresolved glow, ~25″ in diameter, and a slender string of unresolved stars that run SE and appear to connect NGC 1836 to BRHT 4b. A couple of mag 15 stars are resolved in the connecting string. NGC 1836 forms a striking pair with NGC 1839 that lies just 2.5′ E.

Bhatia et al. (1991) listed NGC 1836 and BRHT 4b as a binary cluster but despite their proximity, they have very different ages. Thus the possibility of them being a binary cluster is very unlikely.

 

NGC 1836

BRHT 4b  (Binary Cluster)

BRHT 4b: RA 05 05 40.0   Dec: -68 38 11   Size .34′

16″ at 228x: BRHT 4b appears as a small, brightish, round glow of unresolved stars, ~10″ in diameter. 

BRHT 4b

HS 109 (Open Cluster)

RA 05 05 37.4   Dec -68 43 03   Mag 12.5   Size 1.0ʹ x 0.9ʹ

16″ at 228x: HS 109 appears as a very faint, narrow glow of unresolved stars, ~10″ elongated N-S.

HS 109

NGC 1839 (Open Cluster)

RA 05 06 03.2   Dec -68 37 37   Mag 11.8   Size 1.6′

16″ at 228x: NGC 1839 appears as a bright, irregular glow, ~25″ in diameter. A couple of mag 15 stars are resolved on its edges. A pretty group of 6 mag 14+ stars, arranged in two N-S strings of three stars each, lies off the west side of NGC 1839. NGC 1839 forms a very attractive pair with NGC 1836 that lies just 2.5′ W.

NGC 1839

HS 117 (Open Cluster)

RA 05 06 23.5   Dec -68 42 13   Mag 13.0   Size 1.2ʹ x 1.1ʹ

16″ at 228x: HS 117 appears as a faint, round glow, ~20″ in diameter, with one mag 13 star resolved.

HS 117

HS 118 (Open Cluster)

RA 05 06 47.4   Dec -68 36 59   Mag –   Size 1.2ʹ x 1.1ʹ

16″ at 228x: HS 118 appears as an exceedingly faint, and very small slight brightening against the bright background haze.

HS 118

SL 234 (Open Cluster)

RA 05 06 53.8   Dec -68 43 07   Mag 12.4   Size 1.1′ x 1.0′

16″ at 228x: SL 234 appears as a relatively faint, round glow against the background haze, ~25″ in diameter, with a couple of mag 15 stars resolved on the SW edge of its glow.

SL 234

LH 27 + SL 237 (OB Association + Open Cluster)

RA 05 07 08.0   Dec -69 08 06   Size 4ʹx3ʹ

16″ at 228x: A lovely surprise! Sizable and almost round, 4′ x 3 in diameter, LH 27 stands out beautifully against the glowing background, with a handful of bright little stars (mag 11.5-13), a rich background haze of unresolved stars, and the very pretty SL 237 with an unusual “cat’s paw” appearance. It’s a real treat to spend time with this little beauty! SL 237 is lovely. It lies in the haze of unresolved stars towards the western side of the association. Beautifully bright and irregular, ~35″ in diameter, it has a bright roundish knot with a fuzzy arc that arches around it from its SE side to its NNW side. A bright mag 11 star lies at the NNW end and couple of other very small stars are embedded in the arc… giving it that miniature cat’s paw appearance (the paw even has a dew claw… a ~14.5 mag star attached to the SW side of the cluster!) The cat’s paw appears as if it is stepping towards a NE-SW swathe of brighter haze and half a dozen nicely resolved stars. In the centre of this swathe lies a small bright-ish little arc of unresolved stars with a couple of tiny stars on its NE end; it harbours the cluster H88 139 ,which appears as a faint and tiny star.

LH 27 + SL 237

NGC 1847 (Young Globular Cluster)

RA 05 07  08.2   Dec -68 58 15   Mag 12.5   Size 1.8′ x 1.60′   Age ~20 million years

16″ at 228x: It’s lovely to see a very young globular cluster set against the glorious glow of the bar and NGC 1847 is a mere fledgling of a globular at only 20 million years of age! And it really is a lovely young chap, appearing bright, oval-shape, ~30′ x 20′ elongated ESE-WNW. It has a brighter core with a small fainter halo, and three ~mag 15 stars are resolved in the halo.

NGC 1847

HS 122 (Open Cluster)

RA 05 07 38.63   Dec -68 47 45   Mag –   Size 08′ x 0.7′

16″ at 228x: HS 122 appears very faint, round, 15″ in diameter.

HS 122

LH 30 (OB Association)

RA 05 08 14.0   Dec -69 13 24   Mag –   Size 2ʹ

16″ at 228x: LH 30’s  round haze of unresolved stars stands out well against its bright background. It is 2′ in diameter, and half a dozen stars – one a nice brighter mag 12, the rest 13-14 mag – are distributed across the soft haze, along with some tiny pinprick stars.

LH 30

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