HSC 665

0.43 UTI

0.39

C_N

1.0

C_dens

0.38

C_C3

0.25

C_lit

0.95

C_dup

C3 classification CB

Number of members (P>50%) 39

Radius (P>50% members) 1.5 [arcmin]

C_N 0.39 Poorly populated
C_dens 1.0 Very dense
C_C3 0.38 Low quality
C_lit 0.25 Poorly studied
C_dup 0.95 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 665 is a poorly populated, very dense 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, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

Note: This is a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 665 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	–	310.597	45.495	0.31	-3.348	-5.137	–
Hu & Soubiran	2025	310.597	45.492	–	–	–	–
Hunt & Reffert	2024	310.596	45.494	0.305	-3.337	-5.119	–
Cavallo et al.	2024	310.597	45.492	0.306	–	–	–
Hunt & Reffert	2023	310.596	45.494	0.305	-3.337	-5.119	–

💡 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]	Bfr	BSS
Hu & Soubiran	2025	–	–	–	–	-0.260*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	451*	–	–
Cavallo et al.	2024	2.70	1.98	–	617	0.310	–	–	–
Hunt & Reffert	2023	2.91	2.69	2.11	211	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3421	92.3	310.6	45.49	0.31	-3.35	-5.14	–	0.02
FoF 1768	5.1	310.69	45.5	0.31	-3.26	-4.78	-38.67	0.04

💡 Note: The % column shows the percentage of members that HSC 665 shares with each listed object.

Visualization

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