HSC 2215

0.12 UTI

0.25

C_N

0.03

C_dens

0.25

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 25

Core radius and density 4.1 [pc], 0.2 [pc^-2]

C3 classification CC

C_N 0.25 Poorly populated
C_dens 0.03 Very loose
C_C3 0.25 Low 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 2215 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, 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 Low extinction Near-solar metallicity Young

Palma et al. (2025)
Part of multiple system G143, along with Theia_105, HSC_2126 and HSC_2235.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for HSC 2215 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–	143.35	-50.726	1.904	-11.831	4.385	17.651
Swiggum et al.	2024	141.918	-49.83	1.909	-11.769	4.343	17.545
Cavallo et al.	2024	143.79	-50.788	1.904	–	–	–
Hunt & Reffert	2023	141.918	-49.83	1.909	-11.769	4.343	18.907

💡 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–	0.52	0.315	0.61	58	0.150	357	–	–
Swiggum et al.	2024	0.52	–	–	58	–	357	–	–
Cavallo et al.	2024	0.54	0.53	–	22	0.150	–	–	–
Hunt & Reffert	2023	0.51	0.10	0.61	58	–	–	–	–

Visualization

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