HSC 657

0.21 UTI

0.41

C_N

0.19

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 41

Core radius and density 2.1 [pc], 1.0 [pc^-2]

C3 classification CB

C_N 0.41 Poorly populated
C_dens 0.19 Very loose
C_C3 0.38 Low 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 657 is a poorly populated, very loose object of low 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, young cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a significant 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.

Relatively close Moderate extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.72 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.72 (50th percentile).

Data

🔍 Search references for HSC 657 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–	306.687	46.814	0.377	-2.027	-4.715	-22.156
Hunt & Reffert	2024	306.688	46.825	0.36	-2.034	-4.7	-22.166
Cavallo et al.	2024	306.742	46.786	0.359	–	–	–
Hunt & Reffert	2023	306.688	46.825	0.36	-2.034	-4.7	-22.166

💡 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–	2.59	2.67	2.04	84	0.230	178	–	–
Hunt & Reffert	2024	2.59	2.67	2.04	84	–	178⁽¹⁾	–	–
Cavallo et al.	2024	2.47	2.93	–	39	0.230	–	–	–
Hunt & Reffert	2023	2.59	2.67	2.04	84	–	–	–	–

(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 3250	56.1	306.69	46.82	0.38	-2.01	-4.71	-8.61	0.01

💡 Note: The % column shows the percentage of members that HSC 657 shares with each listed object.

Visualization

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