HSC 1539

0.18 UTI

0.34

C_N

0.14

C_dens

0.25

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 34

Core radius and density 2.0 [pc], 0.7 [pc^-2]

C3 classification CC

C_N 0.34 Poorly populated
C_dens 0.14 Very loose
C_C3 0.25 Low quality
C_lit 0.1 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 1539 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young 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.

Close Low extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold 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 1539 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–	90.729	14.594	1.15	-1.599	-1.528	5.228
Yang et al.	2025	90.691	14.594	–	–	–	–
Zhang et al.	2024	90.691	14.594	–	–	–	–
Hunt & Reffert	2024	90.691	14.594	1.145	-1.577	-1.491	14.879
Cavallo et al.	2024	90.674	14.596	1.145	–	–	–
Hunt & Reffert	2023	90.691	14.594	1.145	-1.577	-1.491	14.879

💡 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–	0.83	0.37	0.86	36	-0.185	95	–	–
Yang et al.	2025	–	–	–	36	-0.190⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.185⁽¹⁾	–	–	–
Hunt & Reffert	2024	0.83	0.37	0.86	36	–	95⁽¹⁾	–	–
Cavallo et al.	2024	1.01	0.53	–	19	0.150	–	–	–
Hunt & Reffert	2023	0.83	0.37	0.86	36	–	–	–	–

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

Visualization

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