HSC 2145

0.36 UTI

0.25

C_N

0.57

C_dens

0.38

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 2.9 [N/pc²]

C3 classification CB

C_N 0.25 Poorly populated
C_dens 0.57 Moderately dense
C_C3 0.38 Low quality
C_lit 0.3 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 2145 is a poorly populated, moderately dense object of low 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, but with a large variance across recent sources for the age parameter (see Parameters). It was recently reported in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as primordial binary cluster 221 along with Theia_1742, and of multiple system 63 along with UBC_1621 and Theia_1742.

Palma et al. (2025)
Part of multiple system G139, along with Theia_1742 and UBC_1621.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 2145 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–	131.564	-47.001	0.6	-7.002	3.993	52.07
Liu et al.	2025	131.52	-46.99	0.6	-7.02	4.01	34.84
Hu & Soubiran	2025	131.553	-46.971	–	–	–	–
Hunt & Reffert	2024	131.515	-46.992	0.598	-7.022	4.013	34.844
Cavallo et al.	2024	131.553	-46.971	0.599	–	–	–
Hunt & Reffert	2023	131.515	-46.992	0.598	-7.022	4.013	34.844

💡 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–	1.69	0.89	0.98	126	-0.095	127	–	–
Liu et al.	2025	2.32	0.36	–	98	–	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.200⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	127⁽¹⁾	–	–
Cavallo et al.	2024	1.69	0.96	–	562	0.010	–	–	–
Hunt & Reffert	2023	1.58	0.89	0.98	126	–	–	–	–

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

Visualization

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