HSC 1438

0.16 UTI

0.41

C_N

0.04

C_dens

0.5

C_C3

0.13

C_lit

0.66

C_dup

N_m (P>50%) 41

Core radius and density 4.5 [pc], 0.2 [pc^-2]

C3 classification BB

C_N 0.41 Poorly populated
C_dens 0.04 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.13 Rarely studied
C_dup 0.66 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 1438 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, below 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 parameter (see Parameters). It was recently reported in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 193 along with HSC_1426, and as tidal capture (resonant trapping binary) 195 along with Theia_66, and of multiple system 35 along with Theia_71, CWNU_1129, Theia_54, HSC_1426 and Theia_66.

Palma et al. (2025)
Part of multiple system G115, along with HSC_1373 and HSC_1426.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for HSC 1438 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–	57.711	9.737	6.632	24.149	-23.82	16.543
Liu et al.	2025	60.27	8.34	6.69	24.0	-23.57	15.94
Yang et al.	2025	60.266	8.339	–	–	–	–
Zhang et al.	2024	60.266	8.339	–	–	–	–
Swiggum et al.	2024	60.266	8.339	6.69	24.0	-23.566	15.3
Cavallo et al.	2024	58.648	9.643	6.657	–	–	–
Hunt & Reffert	2023	60.266	8.339	6.69	24.0	-23.566	15.942

💡 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–	0.15	0.2	0.7	57	0.120	85	–	–
Liu et al.	2025	0.16	0.10	–	59	–	–	–	–
Yang et al.	2025	–	–	–	56	0.080⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	0.120⁽¹⁾	–	–	–
Swiggum et al.	2024	0.15	–	–	57	–	85	–	–
Cavallo et al.	2024	0.15	0.73	–	38	0.160	–	–	–
Hunt & Reffert	2023	0.14	0.20	0.70	57	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UPK 367	34.1	56.15	11.42	6.61	24.6	-24.2	16.18	0.1

💡 Note: The % column shows the percentage of members that HSC 1438 shares with each listed object.

Visualization

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