HSC 1938

0.20 UTI

0.0

C_N

0.14

C_dens

0.38

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 18

Stellar density (N₅₀/rad) 0.7 [N/pc²]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.14 Very loose
C_C3 0.38 Low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 1938 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate 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 age parameter (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 Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 1938 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–	117.831	-25.197	0.39	-1.587	1.402	28.169
Hu & Soubiran	2025	117.865	-25.135	–	–	–	–
Hunt & Reffert	2024	117.819	-25.178	0.377	-1.574	1.392	9.282
Cavallo et al.	2024	117.865	-25.135	0.376	–	–	–
Hunt & Reffert	2023	117.819	-25.178	0.377	-1.574	1.392	9.282

💡 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–	2.325	0.475	0.66	568	0.025	63	–	–
Hu & Soubiran	2025	–	–	–	–	-0.080⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	63⁽¹⁾	–	–
Cavallo et al.	2024	2.21	0.49	–	912	0.130	–	–	–
Hunt & Reffert	2023	2.44	0.46	0.66	224	–	–	–	–

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

Visualization

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