HSC 2140

0.27 UTI

0.0

C_N

0.53

C_dens

1.0

C_C3

0.06

C_lit

0.8

C_dup

N_m (P>50%) 23

Core radius and density 1.2 [pc], 2.7 [pc^-2]

C3 classification AA

C_N 0.0 Sparse
C_dens 0.53 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.06 Rarely studied
C_dup 0.8 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 2140 is a sparse, moderately dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It was recently reported in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for HSC 2140 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–	131.176	-46.151	0.214	-3.306	3.934	–
Hu & Soubiran	2025	131.181	-46.141	–	–	–	–
Hunt & Reffert	2024	131.18	-46.151	0.212	-3.293	3.926	–
Cavallo et al.	2024	131.181	-46.141	0.209	–	–	–
Hunt & Reffert	2023	131.18	-46.151	0.212	-3.293	3.926	–

💡 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–	4.31	2.01	0.615	114	-0.230	172	–	–
Hunt & Reffert	2024	4.31	2.01	0.62	114	–	172⁽¹⁾	–	–
Cavallo et al.	2024	3.08	1.52	–	562	-0.230	–	–	–
Hunt & Reffert	2023	4.32	2.01	0.61	114	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3263	92.0	131.18	-46.15	0.2	-3.3	3.94	–	0.07
Bochum 7	20.0	131.2	-45.99	0.19	-3.39	3.87	–	0.17

💡 Note: The % column shows the percentage of members that HSC 2140 shares with each listed object.

Visualization

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