HSC 1581

0.10 UTI

0.0

C_N

0.13

C_dens

0.38

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 20

Stellar density (N₅₀/rad) 0.6 [N/pc²]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.13 Very 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 1581 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (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.

Relatively close Low extinction Intermediate age

Data

🔍 Search references for HSC 1581 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–	90.045	8.567	0.511	0.302	-3.35	43.179
Hunt & Reffert	2024	90.066	8.566	0.51	0.305	-3.318	–
Hunt & Reffert	2023	90.066	8.566	0.51	0.305	-3.318	–

💡 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–	1.83	0.56	0.72	300	–	56	–	–
Hunt & Reffert	2024	–	–	–	–	–	56⁽¹⁾	–	–
Hunt & Reffert	2023	1.83	0.56	0.72	300	–	–	–	–

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

Visualization

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