HSC 2678

0.24 UTI

0.0

C_N

0.47

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 22

Stellar density (N₅₀/rad) 2.3 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.47 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 2678 is a sparse, loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity 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.

Relatively close High extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G39, along with CWNU_2792, CWNU_1560 and CWNU_1528.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 2678 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–	226.591	-59.29	0.399	-5.244	-2.406	-46.976
Hu & Soubiran	2025	226.566	-59.285	–	–	–	–
Hunt & Reffert	2024	226.503	-59.291	0.4	-5.235	-2.406	-37.058
Cavallo et al.	2024	226.566	-59.285	0.399	–	–	–
Hunt & Reffert	2023	226.503	-59.291	0.4	-5.235	-2.406	-37.058

💡 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–	2.345	4.215	0.65	964	-0.400	389	–	–
Hu & Soubiran	2025	–	–	–	–	-0.210⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	389⁽¹⁾	–	–
Cavallo et al.	2024	2.44	4.31	–	1023	-0.590	–	–	–
Hunt & Reffert	2023	2.25	4.12	0.65	906	–	–	–	–

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

Visualization

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