HSC 868

0.22 UTI

0.63

C_N

0.17

C_dens

0.75

C_C3

0.03

C_lit

0.68

C_dup

N_m (P>50%) 76

Core radius and density 3.7 [pc], 0.8 [pc^-2]

C3 classification AB

C_N 0.63 Moderately populated
C_dens 0.17 Very loose
C_C3 0.75 High quality
C_lit 0.03 Rarely studied
C_dup 0.68 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 868 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It was recently reported in the literature.

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

Distant High extinction Massive Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P323, along with CWNU_1625.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for HSC 868 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–	343.424	62.813	0.27	-1.983	-1.008	-56.862
Hunt & Reffert	2024	343.461	62.819	0.274	-2.003	-1.003	-56.887
Cavallo et al.	2024	343.446	62.82	0.275	–	–	–
Hunt & Reffert	2023	343.461	62.819	0.274	-2.003	-1.003	-56.887

💡 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–	3.33	3.43	2.17	74	-0.260	1062	–	–
Hunt & Reffert	2024	3.33	3.43	2.17	74	–	1062⁽¹⁾	–	–
Cavallo et al.	2024	2.39	3.37	–	372	-0.260	–	–	–
Hunt & Reffert	2023	3.33	3.43	2.17	74	–	–	–	–

(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 3365	100.0	343.44	62.81	0.27	-1.99	-1.02	-56.86	0.15
FoF 1822	31.6	343.41	62.82	0.26	-2.11	-1.01	-101.64	0.24

💡 Note: The % column shows the percentage of members that HSC 868 shares with each listed object.

Visualization

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