HSC 9

0.24 UTI

0.0

C_N

0.21

C_dens

1.0

C_C3

0.0

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 1.4 [pc], 1.0 [pc^-2]

C3 classification AA

C_N 0.0 Sparse
C_dens 0.21 Very loose
C_C3 1.0 Very high quality
C_lit 0.0 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 9 is a sparse, very loose object of very high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a young cluster (see Parameters). It was recently reported in the literature.

⚠️ 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.

Relatively close Moderate extinction Young

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.14 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.14 (50th percentile).

Data

🔍 Search references for HSC 9 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–	269.178	-29.247	0.552	2.105	-0.316	21.68
Hunt & Reffert	2024	269.054	-29.334	0.549	2.12	-0.289	21.635
Hunt & Reffert	2023	269.054	-29.334	0.549	2.12	-0.289	21.635

💡 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–	1.72	2.18	2.34	41	–	148	–	–
Hunt & Reffert	2024	1.72	2.18	2.34	41	–	148⁽¹⁾	–	–
Hunt & Reffert	2023	1.72	2.18	2.34	41	–	–	–	–

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

Visualization

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