HSC 221

0.32 UTI

0.41

C_N

0.36

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 41

Core radius and density 1.2 [pc], 1.8 [pc^-2]

C3 classification AB

C_N 0.41 Poorly populated
C_dens 0.36 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 221 is a poorly populated, loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by very high extinction. It is catalogued as a massive, near-solar metallicity, very young cluster (see Parameters). It was recently reported in the literature.

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

Relatively close Very high extinction Massive Near-solar metallicity Very young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.53 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.53 (50th percentile).

Data

🔍 Search references for HSC 221 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–	277.795	-10.88	0.364	0.004	-1.971	38.491
Hunt & Reffert	2024	277.786	-10.875	0.372	-0.039	-1.975	38.474
Cavallo et al.	2024	277.796	-10.893	0.374	–	–	–
Hunt & Reffert	2023	277.786	-10.875	0.372	-0.039	-1.975	38.474

💡 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–	2.52	5.83	2.58	7	0.070	1676	–	–
Hunt & Reffert	2024	2.52	5.83	2.58	7	–	1676⁽¹⁾	–	–
Cavallo et al.	2024	1.86	5.36	–	15	0.070	–	–	–
Hunt & Reffert	2023	2.52	5.83	2.58	7	–	–	–	–

(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 3751	70.7	277.8	-10.9	0.36	0.03	-1.96	38.49	0.03

💡 Note: The % column shows the percentage of members that HSC 221 shares with each listed object.

Visualization

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