HSC 391

0.19 UTI

0.26

C_N

0.14

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 1.2 [pc], 0.7 [pc^-2]

C3 classification BB

C_N 0.26 Poorly populated
C_dens 0.14 Very loose
C_C3 0.5 Intermediate 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 391 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, intermediate-age cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

⚠️ 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 Metal-rich Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Data

🔍 Search references for HSC 391 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–	295.706	7.633	0.755	2.05	-0.796	-33.337
Hunt & Reffert	2024	295.729	7.611	0.744	1.971	-0.821	-30.552
Cavallo et al.	2024	295.717	7.657	0.744	–	–	–
Hunt & Reffert	2023	295.729	7.611	0.744	1.971	-0.821	-30.552

💡 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–	1.26	1.55	1.98	238	0.520	94	–	–
Hunt & Reffert	2024	1.26	1.55	1.98	238	–	94⁽¹⁾	–	–
Cavallo et al.	2024	1.37	1.42	–	363	0.520	–	–	–
Hunt & Reffert	2023	1.26	1.55	1.98	238	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3196	92.3	295.71	7.63	0.76	2.06	-0.79	-33.34	0.01

💡 Note: The % column shows the percentage of members that HSC 391 shares with each listed object.

Visualization

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