HSC 528

0.50 UTI

0.27

C_N

1.0

C_dens

0.75

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 27

Stellar density (N₅₀/rad) 9.0 [N/pc²]

C3 classification BA

C_N 0.27 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High 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 528 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a large^* distance, above the mid-plane, affected by high extinction. It is catalogued as a massive, 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.

(*): The parallax distance estimate (~8.52 kpc) differs significantly from the median photometric distance (~6.55 kpc).

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

Very distant High extinction Massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 528 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–	297.708	30.208	0.117	-2.536	-4.704	-40.481
Hu & Soubiran	2025	297.706	30.213	–	–	–	–
Hunt & Reffert	2024	297.705	30.211	0.104	-2.531	-4.704	–
Cavallo et al.	2024	297.706	30.213	0.106	–	–	–
Hunt & Reffert	2023	297.705	30.211	0.104	-2.531	-4.704	–

💡 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–	6.55	3.08	0.67	976	-0.120	2656	–	–
Hu & Soubiran	2025	–	–	–	–	-0.310⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	2656⁽¹⁾	–	–
Cavallo et al.	2024	4.74	2.86	–	1445	0.070	–	–	–
Hunt & Reffert	2023	8.36	3.30	0.67	507	–	–	–	–

(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 3137	100.0	297.71	30.21	0.14	-2.54	-4.7	-40.48	0.11

💡 Note: The % column shows the percentage of members that HSC 528 shares with each listed object.

Visualization

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