HSC 643

0.20 UTI

0.32

C_N

0.25

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 32

Core radius and density 2.3 [pc], 1.2 [pc^-2]

C3 classification CB

C_N 0.32 Poorly populated
C_dens 0.25 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 643 is a poorly populated, loose object of low C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by very high extinction. It is catalogued as a metal-rich, young cluster (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.

Relatively close Very high extinction Metal-rich Young

Cavallo et al. (2024)
Wood sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.87 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.87 (50th percentile).

Data

🔍 Search references for HSC 643 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–	312.71	41.735	0.31	-2.131	-3.309	-63.721
Hunt & Reffert	2024	312.707	41.72	0.308	-2.137	-3.322	-32.94
Cavallo et al.	2024	312.696	41.76	0.31	–	–	–
Hunt & Reffert	2023	312.707	41.72	0.308	-2.137	-3.322	-32.94

💡 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–	2.95	5.46	2.245	99	0.800	409	–	–
Hunt & Reffert	2024	2.95	5.46	2.24	99	–	409⁽¹⁾	–	–
Cavallo et al.	2024	3.72	4.77	–	110	0.800	–	–	–
Hunt & Reffert	2023	2.95	5.46	2.25	99	–	–	–	–

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

Visualization

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