HSC 2055

0.17 UTI

0.0

C_N

0.12

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

C3 classification CC

Number of members (P>50%) 22

Radius (P>50% members) 2.9 [arcmin]

C_N 0.0 Sparse
C_dens 0.12 Very loose
C_C3 0.25 Low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 2055 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (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.

Very distant Moderate extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 2055 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	–	130.21	-35.641	0.14	-2.862	4.083	92.254
Hu & Soubiran	2025	130.19	-35.636	–	–	–	–
Hunt & Reffert	2024	130.197	-35.64	0.136	-2.874	4.08	92.247
Cavallo et al.	2024	130.19	-35.636	0.136	–	–	–
Hunt & Reffert	2023	130.197	-35.64	0.136	-2.874	4.08	92.247

💡 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]	Bfr	BSS
Hu & Soubiran	2025	–	–	–	–	-0.120*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	354*	–	–
Cavallo et al.	2024	5.32	1.62	–	1349	-0.770	–	–	–
Hunt & Reffert	2023	6.21	1.59	1.47	946	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3395	80.0	130.21	-35.64	0.14	-2.85	4.08	92.25	0.05

💡 Note: The % column shows the percentage of members that HSC 2055 shares with each listed object.

Visualization

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