HSC 858

0.14 UTI

0.0

C_N

0.13

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 2.8 [pc], 0.6 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.13 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 858 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, 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.

Distant High extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.37 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.37 (50th percentile).

Data

🔍 Search references for HSC 858 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–	344.559	60.208	0.289	-2.37	-2.912	–
Hunt & Reffert	2024	344.542	60.208	0.282	-2.409	-2.914	–
Cavallo et al.	2024	344.645	60.214	0.276	–	–	–
Hunt & Reffert	2023	344.542	60.208	0.282	-2.409	-2.914	–

💡 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–	3.37	3.89	1.99	190	0.450	351	–	–
Hunt & Reffert	2024	3.37	3.89	1.99	190	–	351⁽¹⁾	–	–
Cavallo et al.	2024	3.72	4.05	–	141	0.450	–	–	–
Hunt & Reffert	2023	3.37	3.89	1.99	190	–	–	–	–

(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 3227	96.0	344.56	60.21	0.3	-2.36	-2.91	–	0.05

💡 Note: The % column shows the percentage of members that HSC 858 shares with each listed object.

Visualization

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