HSC 771

0.19 UTI

0.0

C_N

0.13

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 2.5 [pc], 0.6 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.13 Very loose
C_C3 0.75 High quality
C_lit 0.03 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 771 is a sparse, very loose object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, young 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.

Close Moderate extinction Metal-rich Young

Palma et al. (2025)
Part of multiple system G223, along with IC_1396, UPK_164 and OC_0160.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for HSC 771 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–	322.674	57.816	1.104	-4.252	-2.951	-28.861
Hunt & Reffert	2024	322.472	57.792	1.11	-4.263	-2.97	-34.592
Cavallo et al.	2024	322.654	57.882	1.098	–	–	–
Hunt & Reffert	2023	322.472	57.792	1.11	-4.263	-2.97	-34.592

💡 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–	0.87	1.66	0.43	21	0.630	79	–	–
Hunt & Reffert	2024	0.87	1.66	0.43	21	–	79⁽¹⁾	–	–
Cavallo et al.	2024	1.08	1.50	–	10	0.630	–	–	–
Hunt & Reffert	2023	0.87	1.66	0.43	21	–	–	–	–

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

Visualization

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