HSC 250

0.28 UTI

0.27

C_N

0.24

C_dens

0.38

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 27

Stellar density (N₅₀/rad) 1.2 [N/pc²]

C3 classification CB

C_N 0.27 Poorly populated
C_dens 0.24 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 250 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, 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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as primordial binary cluster 166 along with UBC_1033.

Palma et al. (2025)
Part of multiple system G156, along with UBC_1033, HSC_249 and HSC_245.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 250 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–	278.701	-6.023	0.426	-0.519	-2.171	–
Hunt & Reffert	2024	278.68	-5.996	0.442	-0.507	-2.176	–
Cavallo et al.	2024	278.718	-6.082	0.439	–	–	–
Hunt & Reffert	2023	278.68	-5.996	0.442	-0.507	-2.176	–

💡 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–	2.36	2.64	0.99	129	-0.090	223	–	–
Liu et al.	2025	6.34	1.02	–	40	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	223⁽¹⁾	–	–
Cavallo et al.	2024	2.36	2.92	–	145	-0.090	–	–	–
Hunt & Reffert	2023	2.12	2.64	0.99	129	–	–	–	–

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

Visualization

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