HSC 2549

0.11 UTI

0.0

C_N

0.1

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 2.0 [pc], 0.5 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.1 Very loose
C_C3 0.38 Low quality
C_lit 0.03 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 2549 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close High extinction Near-solar metallicity Young

Palma et al. (2025)
Part of multiple system G158, along with UBC_525, HSC_2562 and Theia_2478.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.88 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.88 (50th percentile).

Data

🔍 Search references for HSC 2549 in: SciX Simbad

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Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	194.854	-64.034	0.435	-3.278	-1.668	-14.459
Hunt & Reffert	2024	194.874	-64.012	0.436	-3.249	-1.655	-14.376
Cavallo et al.	2024	194.932	-64.076	0.432	–	–	–
Hunt & Reffert	2023	194.874	-64.012	0.436	-3.249	-1.655	-14.376

💡 Note: The UCC values are estimated from its identified members.

Reference	Year	Dist [kpc]	Av [mag]	DAv [mag]	Age [Myr]	[Fe/H] [dex]	Mass [Msun]	B_frac	BSS
UCC	99999–	2.17	3.07	1.87	25	0.110	170	–	–
Hunt & Reffert	2024	2.17	3.07	1.87	25	–	170⁽¹⁾	–	–
Cavallo et al.	2024	1.67	3.15	–	41	0.110	–	–	–
Hunt & Reffert	2023	2.17	3.07	1.87	25	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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