HSC 2403

0.27 UTI

0.31

C_N

0.29

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 31

Stellar density (N₅₀/rad) 1.4 [N/pc²]

C3 classification CC

C_N 0.31 Poorly populated
C_dens 0.29 Loose
C_C3 0.25 Low quality
C_lit 0.25 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 2403 is a poorly populated, 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, intermediate-age 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 Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 227 along with Theia_743.

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P468, along with Theia_743.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 2403 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–	168.674	-58.836	1.448	-13.728	2.047	-7.512
Hunt & Reffert	2024	168.646	-58.836	1.449	-13.672	1.96	-7.636
Cavallo et al.	2024	168.821	-58.836	1.45	–	–	–
Hunt & Reffert	2023	168.646	-58.836	1.449	-13.672	1.96	-7.636

💡 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–	0.69	0.1	0.39	143	0.220	52	–	–
Liu et al.	2025	0.76	0.09	–	138	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	52⁽¹⁾	–	–
Cavallo et al.	2024	0.69	0.43	–	148	0.220	–	–	–
Hunt & Reffert	2023	0.66	0.10	0.39	143	–	–	–	–

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

Visualization

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