HSC 1306

0.20 UTI

0.0

C_N

0.38

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 1.1 [pc], 1.9 [pc^-2]

C3 classification DA

C_N 0.0 Sparse
C_dens 0.38 Loose
C_C3 0.5 Intermediate 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 1306 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a large distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age 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.

Very distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

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

Data

🔍 Search references for HSC 1306 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–	77.295	39.017	0.173	0.832	-0.031	-18.83
Hu & Soubiran	2025	77.288	38.998	–	–	–	–
Hunt & Reffert	2024	77.294	39.019	0.186	0.81	-0.024	-18.83
Cavallo et al.	2024	77.288	38.998	0.185	–	–	–
Hunt & Reffert	2023	77.294	39.019	0.186	0.81	-0.024	-18.83

💡 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–	5.9	1.71	0.83	615	-0.260	261	–	–
Hu & Soubiran	2025	–	–	–	–	-0.280⁽⁵⁾	–	–	–
Hunt & Reffert	2024	5.90	1.71	0.83	615	–	261⁽¹⁾	–	–
Cavallo et al.	2024	3.82	2.10	–	575	-0.240	–	–	–
Hunt & Reffert	2023	5.90	1.71	0.83	615	–	–	–	–

(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 3157	96.0	77.29	39.01	0.18	0.79	-0.06	-3.88	0.18

💡 Note: The % column shows the percentage of members that HSC 1306 shares with each listed object.

Visualization

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