HSC 977

0.10 UTI

0.0

C_N

0.24

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 23

Stellar density (N₅₀/rad) 1.2 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.24 Very loose
C_C3 0.25 Low 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

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HSC 977 is a sparse, 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, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (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 Intermediate age

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P160, along with NGC_225.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 977 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–	11.934	60.052	1.363	7.977	-0.809	-17.36
Hu & Soubiran	2025	11.703	59.401	–	–	–	–
Cavallo et al.	2024	11.703	59.401	1.426	–	–	–
Hunt & Reffert	2023	11.805	60.103	1.427	7.78	-0.801	-22.922

💡 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–	0.685	0.47	0.36	292	0.315	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.120⁽⁵⁾	–	–	–
Cavallo et al.	2024	0.70	0.36	–	501	0.750	–	–	–
Hunt & Reffert	2023	0.67	0.58	0.36	83	–	–	–	–

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

Visualization

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