HSC 1255

0.15 UTI

0.0

C_N

0.14

C_dens

0.12

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 21

Stellar density (N₅₀/rad) 0.7 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.14 Very loose
C_C3 0.12 Very 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 1255 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a relatively close distance, near 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

Palma et al. (2025)
Part of multiple system G74, along with LP_2139 and UBC_54.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 1255 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–	69.954	46.205	0.935	-0.929	-2.205	-12.454
Zhang et al.	2024	69.983	46.112	–	–	–	–
Hunt & Reffert	2024	69.983	46.112	0.943	-0.898	-2.209	-8.969
Cavallo et al.	2024	69.576	46.015	0.945	–	–	–
Hunt & Reffert	2023	69.983	46.112	0.943	-0.898	-2.209	-8.969

💡 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–	1.05	2.08	2.58	145	-0.032	63	–	–
Zhang et al.	2024	–	–	–	–	-0.133⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	63⁽¹⁾	–	–
Cavallo et al.	2024	1.10	2.16	–	174	0.070	–	–	–
Hunt & Reffert	2023	1.00	2.00	2.58	116	–	–	–	–

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

Visualization

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