HSC 1331

0.18 UTI

0.0

C_N

0.26

C_dens

0.62

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 20

Stellar density (N₅₀/rad) 1.3 [N/pc²]

C3 classification AC

C_N 0.0 Sparse
C_dens 0.26 Loose
C_C3 0.62 Intermediate quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

ℹ️

HSC 1331 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (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.

Close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P422, along with HSC_1343.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 1331 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	76.71	35.39	1.065	-0.231	-2.99	8.479
Zhang et al.	2024	76.847	35.21	–	–	–	–
Cavallo et al.	2024	76.653	35.369	1.06	–	–	–
Hunt & Reffert	2023	76.847	35.21	1.062	-0.221	-2.99	2.582

💡 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–	0.935	1.53	0.6	260	0.096	–	–	–
Zhang et al.	2024	–	–	–	–	0.022⁽¹⁾	–	–	–
Cavallo et al.	2024	0.97	1.60	–	427	0.170	–	–	–
Hunt & Reffert	2023	0.90	1.46	0.60	92	–	–	–	–

(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 4127	76.0	76.56	35.46	1.06	-0.2	-2.97	8.48	0.04

💡 Note: The % column shows the percentage of members that HSC 1331 shares with each listed object.

Visualization

ℹ️

1 2