HSC 975

0.12 UTI

0.0

C_N

0.05

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 2.8 [pc], 0.2 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.05 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 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 975 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above 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.

Distant Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P384, along with Dolidze_13.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.20 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.20 (50th percentile).

Data

🔍 Search references for HSC 975 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–	11.166	63.781	0.269	0.283	-0.607	-29.022
Hunt & Reffert	2024	11.162	63.805	0.279	0.268	-0.612	-30.361
Cavallo et al.	2024	11.075	63.78	0.28	–	–	–
Hunt & Reffert	2023	11.162	63.805	0.279	0.268	-0.612	-30.361

💡 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–	3.26	2.96	1.82	225	-0.050	208	–	–
Hunt & Reffert	2024	3.26	2.96	1.82	225	–	208⁽¹⁾	–	–
Cavallo et al.	2024	3.31	3.27	–	479	-0.050	–	–	–
Hunt & Reffert	2023	3.26	2.96	1.82	225	–	–	–	–

(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 3435	96.0	11.13	63.78	0.27	0.29	-0.61	-29.02	0.04

💡 Note: The % column shows the percentage of members that HSC 975 shares with each listed object.

Visualization

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