HSC 2239

0.20 UTI

0.41

C_N

0.09

C_dens

0.5

C_C3

0.0

C_lit

1.0

C_dup

N_m (P>50%) 41

Core radius and density 1.8 [pc], 0.5 [pc^-2]

C3 classification BB

C_N 0.41 Poorly populated
C_dens 0.09 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.0 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 2239 is a poorly populated, very loose object of intermediate 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.

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.

Close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Part of multiple system G147, along with HSC_2266, Theia_453 and Theia_1170.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for HSC 2239 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–	144.296	-53.147	1.52	-9.264	5.503	5.411
Cavallo et al.	2024	144.273	-53.215	1.516	–	–	–
Hunt & Reffert	2023	143.795	-53.151	1.516	-9.227	5.473	6.858

💡 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–	0.65	0.43	0.45	87	-0.280	–	–	–
Cavallo et al.	2024	0.67	0.69	–	62	-0.280	–	–	–
Hunt & Reffert	2023	0.63	0.17	0.45	112	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3709	100.0	144.41	-53.24	1.52	-9.27	5.48	5.19	0.07

💡 Note: The % column shows the percentage of members that HSC 2239 shares with each listed object.

Visualization

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