HSC 603

0.20 UTI

0.4

C_N

0.09

C_dens

0.38

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 40

Core radius and density 1.6 [pc], 0.5 [pc^-2]

C3 classification BC

C_N 0.4 Poorly populated
C_dens 0.09 Very loose
C_C3 0.38 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 603 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, above 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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.94 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.94 (50th percentile).

Data

🔍 Search references for HSC 603 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–	298.975	41.615	0.943	0.516	-0.716	-3.833
Hu & Soubiran	2025	298.122	41.116	–	–	–	–
Zhang et al.	2024	299.01	41.605	–	–	–	–
Cavallo et al.	2024	298.122	41.116	0.954	–	–	–
Hunt & Reffert	2023	299.01	41.605	0.948	0.527	-0.62	-5.782

💡 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–	0.985	0.51	1.03	412	-0.160	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.160⁽⁵⁾	–	–	–
Zhang et al.	2024	–	–	–	–	0.026⁽¹⁾	–	–	–
Cavallo et al.	2024	0.97	0.72	–	617	-0.220	–	–	–
Hunt & Reffert	2023	1.00	0.30	1.03	207	–	–	–	–

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

Visualization

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