HSC 1665

0.09 UTI

0.0

C_N

0.02

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 21

Core radius and density 5.9 [pc], 0.1 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.02 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 1665 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young 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.

Very distant Moderate extinction Massive Near-solar metallicity Very young

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.10 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.10 (50th percentile).

Data

🔍 Search references for HSC 1665 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–	99.606	0.743	0.142	-0.251	0.367	–
Hunt & Reffert	2024	99.562	0.735	0.145	-0.213	0.386	82.575
Cavallo et al.	2024	99.634	0.757	0.148	–	–	–
Hunt & Reffert	2023	99.562	0.735	0.145	-0.213	0.386	82.575

💡 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–	6.62	2.69	2.38	19	0.080	1023	–	–
Hunt & Reffert	2024	6.62	2.69	2.38	19	–	1023⁽¹⁾	–	–
Cavallo et al.	2024	4.09	2.36	–	44	0.080	–	–	–
Hunt & Reffert	2023	6.63	2.69	2.38	19	–	–	–	–

(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 3647	96.0	99.64	0.76	0.15	-0.21	0.38	82.57	0.27

💡 Note: The % column shows the percentage of members that HSC 1665 shares with each listed object.

Visualization

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