HSC 590

0.22 UTI

0.25

C_N

0.08

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 0.4 [N/pc²]

C3 classification DB

C_N 0.25 Poorly populated
C_dens 0.08 Very 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 590 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low 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.

Very close Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 590 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–	260.672	52.872	8.339	-1.851	-5.113	-5.151
Hu & Soubiran	2025	259.203	52.269	–	–	–	–
Zhang et al.	2024	263.208	48.636	–	–	–	–
Cavallo et al.	2024	259.203	52.269	8.168	–	–	–
Hunt & Reffert	2023	263.208	48.636	8.214	-1.799	-4.563	-4.456

💡 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–	0.115	0.415	0.76	556	0.050	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.140⁽⁵⁾	–	–	–
Zhang et al.	2024	–	–	–	–	0.269⁽¹⁾	–	–	–
Cavallo et al.	2024	0.12	0.54	–	794	0.050	–	–	–
Hunt & Reffert	2023	0.11	0.29	0.76	319	–	–	–	–

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

Visualization

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