HSC 1641

0.14 UTI

0.0

C_N

0.37

C_dens

0.25

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 1.4 [pc], 1.8 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.37 Loose
C_C3 0.25 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 1641 is a sparse, loose object of low C3 quality. Its parallax locates it at a relatively close distance, near 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.

⚠️ 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

Palma et al. (2025)
Part of multiple system G40, along with CWNU_158, HSC_1636, Collinder_104 and CWNU_1281.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for HSC 1641 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–	99.584	4.193	0.651	-1.797	1.001	–
Hunt & Reffert	2024	99.6	4.206	0.647	-1.81	0.995	–
Cavallo et al.	2024	99.59	4.225	0.647	–	–	–
Hunt & Reffert	2023	99.6	4.206	0.647	-1.81	0.995	–

💡 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–	1.44	1.41	0.73	51	0.460	125	–	–
Hunt & Reffert	2024	1.44	1.41	0.73	51	–	125⁽¹⁾	–	–
Cavallo et al.	2024	1.57	1.42	–	234	0.460	–	–	–
Hunt & Reffert	2023	1.44	1.41	0.73	51	–	–	–	–

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

Visualization

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