HSC 2031

0.17 UTI

0.0

C_N

0.01

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 18

Core radius and density 5.2 [pc], 0.06 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.75 High 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 2031 is a sparse, very loose object of high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, intermediate-age 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.

Very distant Moderate extinction Metal-poor Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for HSC 2031 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–	126.078	-33.535	0.153	-2.248	2.303	126.239
Hunt & Reffert	2024	126.141	-33.544	0.162	-2.257	2.305	126.03
Cavallo et al.	2024	126.062	-33.436	0.162	–	–	–
Hunt & Reffert	2023	126.141	-33.544	0.162	-2.257	2.305	126.03

💡 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–	5.34	1.02	1.905	348	-0.570	150	–	–
Hunt & Reffert	2024	5.34	1.02	1.90	348	–	150⁽¹⁾	–	–
Cavallo et al.	2024	3.66	1.35	–	170	-0.570	–	–	–
Hunt & Reffert	2023	5.34	1.02	1.91	348	–	–	–	–

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

Visualization

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