HSC 80

0.11 UTI

0.0

C_N

0.09

C_dens

0.5

C_C3

0.03

C_lit

0.84

C_dup

N_m (P>50%) 20

Core radius and density 2.2 [pc], 0.5 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.09 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 Rarely studied
C_dup 0.84 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 80 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a metal-poor, very 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 very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=0.84) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close High extinction Metal-poor Very young

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.36 (50th percentile), false positive? (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.36 (50th percentile), false positive? (human-assigned).

Data

🔍 Search references for HSC 80 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–	270.254	-24.328	0.351	0.118	-1.468	17.568
Hunt & Reffert	2024	270.255	-24.335	0.34	0.107	-1.473	16.276
Cavallo et al.	2024	270.254	-24.334	0.34	–	–	–
Hunt & Reffert	2023	270.255	-24.335	0.34	0.107	-1.473	16.276

💡 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–	2.67	3.84	2.61	12	-0.690	597	–	–
Hunt & Reffert	2024	2.67	3.84	2.61	12	–	597⁽¹⁾	–	–
Cavallo et al.	2024	1.43	4.13	–	81	-0.690	–	–	–
Hunt & Reffert	2023	2.67	3.84	2.61	12	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Ryu 596	16.0	270.22	-24.23	0.39	0.06	-1.42	25.14	0.15

💡 Note: The % column shows the percentage of members that HSC 80 shares with each listed object.

Visualization

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