HSC 1340

0.32 UTI

0.78

C_N

0.32

C_dens

1.0

C_C3

0.25

C_lit

0.61

C_dup

N₅₀ (P>50% members) 193

Stellar density (N₅₀/rad) 1.6 [N/pc²]

C3 classification AA

C_N 0.78 Rich
C_dens 0.32 Loose
C_C3 1.0 Very high quality
C_lit 0.25 Poorly studied
C_dup 0.61 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 1340 is a rich, loose object of very high 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, 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, and a small percentage with at least one entry reported in the same catalogue. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 191 along with HSC_1318.

Palma et al. (2025)
Part of multiple system G111, along with HSC_1195, HSC_1318, Melotte_22 and Theia_7.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 1340 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–	68.019	19.839	8.241	0.695	-14.59	15.027
Zhang et al.	2024	61.304	21.985	–	–	–	–
Cavallo et al.	2024	68.624	18.801	8.349	–	–	–
Hunt & Reffert	2023	61.304	21.985	8.348	0.716	-14.547	14.989

💡 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–	0.12	0.3	1.06	35	0.138	–	–	–
Liu et al.	2025	0.12	0.04	–	35	–	–	–	–
Zhang et al.	2024	–	–	–	–	0.026⁽¹⁾	–	–	–
Cavallo et al.	2024	0.12	0.83	–	58	0.250	–	–	–
Hunt & Reffert	2023	0.12	0.30	1.06	27	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 118	39.4	62.83	20.3	8.24	3.7	-13.98	15.09	0.28
CWNU 1094	14.0	61.66	21.29	8.31	4.19	-14.51	15.0	0.44
CWNU 1108	13.0	63.21	20.39	8.14	3.48	-13.84	15.04	0.3
OCSN 271	13.0	70.35	21.84	8.01	-0.6	-15.05	15.87	0.2
HSC 1460	12.4	74.38	17.06	8.49	-2.41	-15.13	14.28	0.24

💡 Note: The % column shows the percentage of members that HSC 1340 shares with each listed object.

Visualization

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