HSC 1149

0.10 UTI

0.27

C_N

0.08

C_dens

0.12

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 27

Stellar density (N₅₀/rad) 0.4 [N/pc²]

C3 classification DC

C_N 0.27 Poorly populated
C_dens 0.08 Very loose
C_C3 0.12 Very 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 1149 is a poorly populated, very loose object of very low C3 quality. Its parallax locates it at a close distance, above 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 absorption 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.

Close Low extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 184 along with Theia_85, and of multiple system 51 along with Theia_85 and Stock_23.

Palma et al. (2025)
Classified as optical pair P27, along with Theia_85.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 1149 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–	62.25	62.154	1.722	-4.257	0.501	-19.78
Liu et al.	2025	60.3	61.61	1.7	-4.22	0.49	-19.79
Cavallo et al.	2024	63.372	61.541	1.703	–	–	–
Hunt & Reffert	2023	60.296	61.606	1.704	-4.219	0.486	-19.79

💡 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–	0.6	0.88	1.59	143	0.450	–	–	–
Liu et al.	2025	0.61	0.18	–	141	–	–	–	–
Cavallo et al.	2024	0.60	1.00	–	151	0.450	–	–	–
Hunt & Reffert	2023	0.56	0.88	1.59	143	–	–	–	–

Visualization

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