HSC 2221

0.23 UTI

0.28

C_N

0.07

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 3.0 [pc], 0.4 [pc^-2]

C3 classification AB

C_N 0.28 Poorly populated
C_dens 0.07 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 2221 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a large distance, below 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.

Very distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.64 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.64 (50th percentile).

Data

🔍 Search references for HSC 2221 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–	137.542	-53.668	0.155	-3.264	2.625	38.3
Hunt & Reffert	2024	137.527	-53.663	0.167	-3.275	2.637	38.302
Cavallo et al.	2024	137.511	-53.655	0.171	–	–	–
Hunt & Reffert	2023	137.527	-53.663	0.167	-3.275	2.637	38.302

💡 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–	5.05	1.12	0.76	313	0.100	241	–	–
Hunt & Reffert	2024	5.05	1.12	0.76	313	–	241⁽¹⁾	–	–
Cavallo et al.	2024	4.43	1.13	–	479	0.100	–	–	–
Hunt & Reffert	2023	5.05	1.12	0.76	313	–	–	–	–

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

Visualization

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