HSC 2518

0.06 UTI

0.0

C_N

0.15

C_dens

0.12

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 23

Stellar density (N₅₀/rad) 0.8 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.15 Very loose
C_C3 0.12 Very low 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 2518 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption parameter (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.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 235 along with HSC_2442, and of multiple system 66 along with HSC_2442 and HSC_2462.

Palma et al. (2025)
Part of multiple system G155, along with HSC_2442 and HSC_2462.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for HSC 2518 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–	184.129	-75.453	3.316	-18.208	-3.776	14.798
Liu et al.	2025	184.31	-75.32	3.3	-18.1	-3.45	14.33
Cavallo et al.	2024	182.432	-75.433	3.275	–	–	–
Hunt & Reffert	2023	184.31	-75.324	3.3	-18.099	-3.453	14.331

💡 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–	0.31	0.61	0.54	78	-0.060	–	–	–
Liu et al.	2025	0.47	0.37	–	78	–	–	–	–
Cavallo et al.	2024	0.31	1.29	–	27	-0.060	–	–	–
Hunt & Reffert	2023	0.30	0.61	0.54	83	–	–	–	–

Visualization

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