HSC 2019

0.20 UTI

0.46

C_N

0.11

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 46

Core radius and density 3.0 [pc], 0.6 [pc^-2]

C3 classification CB

C_N 0.46 Poorly populated
C_dens 0.11 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 2019 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age 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.

Distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for HSC 2019 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–	121.107	-33.985	0.29	-3.294	4.866	–
Hunt & Reffert	2024	121.078	-33.962	0.292	-3.316	4.848	–
Cavallo et al.	2024	121.125	-33.973	0.293	–	–	–
Hunt & Reffert	2023	121.078	-33.962	0.292	-3.316	4.848	–

💡 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–	3.15	1.91	0.68	180	0.290	331	–	–
Hunt & Reffert	2024	3.15	1.91	0.68	180	–	331⁽¹⁾	–	–
Cavallo et al.	2024	2.86	2.11	–	257	0.290	–	–	–
Hunt & Reffert	2023	3.15	1.91	0.68	179	–	–	–	–

(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 3088	95.7	121.12	-33.99	0.29	-3.31	4.86	–	0.05

💡 Note: The % column shows the percentage of members that HSC 2019 shares with each listed object.

Visualization

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