HSC 388

0.18 UTI

0.25

C_N

0.27

C_dens

0.38

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 1.4 [N/pc²]

C3 classification CB

C_N 0.25 Poorly populated
C_dens 0.27 Loose
C_C3 0.38 Low 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 388 is a poorly populated, loose object of low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption and metallicity parameters (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.

Very close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P49, along with OCSN_10.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for HSC 388 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–	272.791	18.142	2.804	-2.126	-7.224	-15.65
Zhang et al.	2024	272.774	18.224	–	–	–	–
Cavallo et al.	2024	272.814	18.07	2.811	–	–	–
Hunt & Reffert	2023	272.774	18.224	2.805	-2.126	-7.182	-20.126

💡 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–	0.355	0.59	0.28	94	0.196	–	–	–
Zhang et al.	2024	–	–	–	–	0.021⁽¹⁾	–	–	–
Cavallo et al.	2024	0.37	1.01	–	37	0.370	–	–	–
Hunt & Reffert	2023	0.34	0.17	0.28	152	–	–	–	–

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

Visualization

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