HSC 2231

0.18 UTI

0.25

C_N

0.39

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 2.0 [N/pc²]

C3 classification DB

C_N 0.25 Poorly populated
C_dens 0.39 Loose
C_C3 0.25 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

ℹ️

HSC 2231 is a poorly populated, loose object of low C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (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 Intermediate age

Palma et al. (2025)
Part of multiple system G207, along with IC_2391, IC_2602 and Platais_8.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 2231 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	145.893	-51.544	6.364	-22.676	-4.934	25.839
Hu & Soubiran	2025	145.114	-51.448	–	–	–	–
Cavallo et al.	2024	145.114	-51.448	6.337	–	–	–
Hunt & Reffert	2023	145.196	-51.246	6.32	-22.301	-4.789	16.447

💡 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–	0.155	0.415	0.55	968	-0.100	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.330⁽⁵⁾	–	–	–
Cavallo et al.	2024	0.16	0.69	–	537	0.130	–	–	–
Hunt & Reffert	2023	0.15	0.14	0.55	1400	–	–	–	–

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

Visualization

ℹ️

1 2