HSC 155

0.14 UTI

0.25

C_N

0.22

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 1.1 [N/pc²]

C3 classification DB

C_N 0.25 Poorly populated
C_dens 0.22 Very loose
C_C3 0.25 Low quality
C_lit 0.0 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 155 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as an 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 Intermediate age

Palma et al. (2025)
Part of multiple system G119, along with Theia_1871 and UBC_1008.

Data

🔍 Search references for HSC 155 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–	273.913	-18.753	0.347	0.083	0.406	-0.558
Hunt & Reffert	2024	273.898	-18.758	0.341	0.065	0.377	-1.347
Hunt & Reffert	2023	273.898	-18.758	0.341	0.065	0.377	-1.347

💡 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–	2.77	1.56	1.73	148	–	150	–	–
Hunt & Reffert	2024	–	–	–	–	–	150⁽¹⁾	–	–
Hunt & Reffert	2023	2.77	1.56	1.73	148	–	–	–	–

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

Visualization

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