HSC 654

0.25 UTI

0.55

C_N

0.31

C_dens

0.25

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 59

Core radius and density 2.0 [pc], 1.6 [pc^-2]

C3 classification DB

C_N 0.55 Moderately populated
C_dens 0.31 Loose
C_C3 0.25 Low 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 654 is a moderately populated, 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 metal-rich, young cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

⚠️ 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.

Distant High extinction Metal-rich Young

Palma et al. (2025)
Classified as optical pair P515, along with UBC_587.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.49 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.49 (50th percentile).

Data

🔍 Search references for HSC 654 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–	311.613	43.891	0.293	-2.308	-4.01	18.328
Hunt & Reffert	2024	311.607	43.9	0.296	-2.311	-4.021	12.581
Cavallo et al.	2024	311.622	43.89	0.293	–	–	–
Hunt & Reffert	2023	311.607	43.9	0.296	-2.311	-4.021	12.581

💡 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–	3.11	4.23	2.7	48	0.500	999	–	–
Hunt & Reffert	2024	3.11	4.23	2.70	48	–	999⁽¹⁾	–	–
Cavallo et al.	2024	3.42	4.05	–	56	0.500	–	–	–
Hunt & Reffert	2023	3.10	4.23	2.70	48	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3078	100.0	311.62	43.89	0.29	-2.31	-4.0	12.3	0.24

💡 Note: The % column shows the percentage of members that HSC 654 shares with each listed object.

Visualization

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