HSC 1667

0.24 UTI

0.0

C_N

0.07

C_dens

1.0

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 3.8 [pc], 0.3 [pc^-2]

C3 classification AA

C_N 0.0 Sparse
C_dens 0.07 Very loose
C_C3 1.0 Very high quality
C_lit 0.06 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 1667 is a sparse, very loose object of very high 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, very 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 Very young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 84 along with CWNU_1015.

Palma et al. (2025)
Classified as optical pair P289, along with CWNU_1057.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for HSC 1667 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–	80.765	-8.55	6.405	8.646	-12.356	24.046
Cavallo et al.	2024	80.539	-7.671	6.412	–	–	–
Hunt & Reffert	2023	81.034	-8.667	6.403	8.583	-12.714	24.75

💡 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–	0.15	0.92	0.63	11	0.360	–	–	–
Liu et al.	2025	0.18	0.02	–	8	–	–	–	–
Cavallo et al.	2024	0.15	0.92	–	25	0.360	–	–	–
Hunt & Reffert	2023	0.15	1.39	0.63	11	–	–	–	–

Visualization

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