HSC 1540

0.12 UTI

0.0

C_N

0.06

C_dens

0.38

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 2.6 [pc], 0.3 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.38 Low quality
C_lit 0.1 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 1540 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

⚠️ 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.

Distant Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for HSC 1540 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–	96.791	17.735	0.174	-0.065	-0.469	18.991
Yang et al.	2025	96.779	17.736	–	–	–	–
Zhang et al.	2024	96.779	17.736	–	–	–	–
Hunt & Reffert	2024	96.779	17.736	0.185	-0.073	-0.406	18.377
Cavallo et al.	2024	96.757	17.761	0.184	–	–	–
Hunt & Reffert	2023	96.779	17.736	0.185	-0.073	-0.406	18.377

💡 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–	4.18	0.74	1.46	154	-0.117	385	–	–
Yang et al.	2025	–	–	–	155	-0.180⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.117⁽¹⁾	–	–	–
Hunt & Reffert	2024	4.18	0.74	1.46	154	–	385⁽¹⁾	–	–
Cavallo et al.	2024	4.53	1.49	–	79	0.170	–	–	–
Hunt & Reffert	2023	4.18	0.74	1.46	154	–	–	–	–

(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 4162	80.0	96.78	17.74	0.18	-0.06	-0.48	18.99	0.07

💡 Note: The % column shows the percentage of members that HSC 1540 shares with each listed object.

Visualization

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