HSC 402

0.10 UTI

0.0

C_N

0.04

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 21

Core radius and density 4.0 [pc], 0.2 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.04 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 402 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age 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 High extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P50, along with UBC_121.

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 402 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–	290.253	12.876	0.605	-0.755	-3.479	12.241
Hunt & Reffert	2024	290.292	12.865	0.605	-0.759	-3.466	29.109
Cavallo et al.	2024	290.241	12.87	0.604	–	–	–
Hunt & Reffert	2023	290.292	12.865	0.605	-0.759	-3.466	29.109

💡 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–	1.6	3.96	0.96	117	-0.080	187	–	–
Hunt & Reffert	2024	1.60	3.96	0.96	117	–	187⁽¹⁾	–	–
Cavallo et al.	2024	1.81	4.08	–	69	-0.080	–	–	–
Hunt & Reffert	2023	1.60	3.96	0.96	117	–	–	–	–

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

Visualization

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