HSC 2091

0.46 UTI

0.34

C_N

1.0

C_dens

0.75

C_C3

0.25

C_lit

0.88

C_dup

N₅₀ (P>50% members) 34

Stellar density (N₅₀/rad) 7.1 [N/pc²]

C3 classification AB

C_N 0.34 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 0.88 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 2091 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Low extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 218 along with Majaess_99, and of multiple system 62 along with Majaess_99 and Theia_1079.

Palma et al. (2025)
Part of multiple system G213, along with OC_0471, CWNU_339, Majaess_99 and Theia_1079.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 2091 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–	126.734	-42.643	0.666	-5.082	4.67	13.835
Liu et al.	2025	126.74	-42.66	0.66	-5.06	4.63	13.82
Hunt & Reffert	2024	126.742	-42.658	0.656	-5.06	4.626	13.824
Cavallo et al.	2024	126.743	-42.646	0.656	–	–	–
Hunt & Reffert	2023	126.742	-42.658	0.656	-5.06	4.626	13.824

💡 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–	1.53	0.71	0.66	178	0.290	116	–	–
Liu et al.	2025	2.26	0.33	–	178	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	116⁽¹⁾	–	–
Cavallo et al.	2024	1.53	0.71	–	234	0.290	–	–	–
Hunt & Reffert	2023	1.43	1.02	0.66	155	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 14127	11.8	126.97	-42.72	0.69	-5.68	4.79	19.76	0.13

💡 Note: The % column shows the percentage of members that HSC 2091 shares with each listed object.

Visualization

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