Bar – Chart 4

A busy little corner of the bar

Location of Chart 4

LH OB Associations: –

NGC Objects: NGC 1828, 1830, 1835

Bar Chart 4

Steve Gottlieb's observations

HS 97 (Open Cluster)

RA 05 03 04.5 Dec -69 28 10 Mag – Size 1.1′ x 0.9′

16″ at 228x: HS 97 is an extremely small and faint glow, barely visible against the backgound glow, and picked up with averted vision.

HS 97

HS 102 (Open Cluster)

RA 05 03 37.3 Dec -69 23 06 Mag – Size 0.9′ x 0.8′

16″ at 228x: HS 102 appears as a very faint, small glow, barely visible against the background glow, picked up with averted vision.

HS 102

NGC 1828 (Open Cluster)

RA 05 04 21.0 Dec -69 23 25 Mag 12.5 Size 1.2′ x 1.1′

16″ at 228x: This cluster is the westernmost cluster of an attractive triangle of clusters with NGC 1830 lying 3.2′ NNE and the ancient globular cluster NGC 1835 lying 4′ ESE. It appears as a fairly faint, round and hazy glow, ~30″ in diameter, brightening very slightly to the centre. No stars are resolved. It appears quite similar to NGC 1830.

NGC 1828

BSDL 529 (Open Cluster)

RA 05 04 23.9 Dec -69 28 01.7 Mag – Size 0.8′ x 0.7′

16″ at 228x: BSDL 529 appears as a very small, very faint glow.

BSDL 529

NGC 1830 + BRHT 3b (Binary Cluster)

NGC 1830: RA 05 04 39.5 Dec -69 20 33 Mag 12.6 Size 1.3′ x 1.2′ Sep 1.2′ PA 45°

BRHT 3b: RA 05 04 30.5 Dec -69 21 18 Size 0.2′

16″ at 228x: This binary cluster forms the northern apex of a distinctive triangle with NGC 1828 lying 3′ SSW and the ancient globular cluster, NGC 1835 lying 4.6′ SE. It appears quite similar to NGC 1828, only slightly fainter (but not enough to take it from fairly faint to faint), thus it appears as a fairly faint, round and hazy glow, ~30″ in diameter. Its companion, BRHT 3b, lies 1.2′ SW, and it appears as an extremely faint, very small, off-round glow.

NGC 1830 + BRHT 3b

NGC 1835 (Ancient Globular Cluster)

RA 05 05 09.2 Dec -69 24 20 Mag 10.6 Size 2.3′ x 2.3′ Age ≥ 12 billion years

16″ at 228x: The ancient globular cluster is the southernmost cluster of an attractive triangle of clusters with NGC 1828 lying 4′ WNW and NGC 1830 lying 4.6′ NW. It is brightest of the three clusters, and it is just gorgeous! It appears bright, round, 1.5′ in diameter, and brightening to a very bright 20″ core. Its halo has an enticingly gritty appearance, although no stars are resolved. This young globular cluster has the highest known number of RR Lyr variables in the LMC (84).