HSC 340

0.24 UTI

0.0

C_N

0.56

C_dens

0.62

C_C3

0.0

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 0.9 [pc], 2.8 [pc^-2]

C3 classification AC

C_N 0.0 Sparse
C_dens 0.56 Moderately dense
C_C3 0.62 Intermediate 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 340 is a sparse, moderately dense object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by very high extinction. It is catalogued as a very massive, old 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 Very high extinction Very massive Old

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.31 (50th percentile), false positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.31 (50th percentile), false positive (human-assigned).

Data

🔍 Search references for HSC 340 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–	285.491	2.326	0.442	0.08	-1.43	-0.367
Hunt & Reffert	2024	285.491	2.322	0.459	0.097	-1.432	–
Hunt & Reffert	2023	285.491	2.322	0.459	0.097	-1.432	–

💡 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–	1.97	5.3	1.94	3272	–	5103	–	–
Hunt & Reffert	2024	1.97	5.30	1.94	3271	–	5103⁽¹⁾	–	–
Hunt & Reffert	2023	1.97	5.30	1.94	3273	–	–	–	–

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

Visualization

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