HSC 2689

0.09 UTI

0.0

C_N

0.06

C_dens

0.38

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 17

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.06 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 2689 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, well below the mid-plane, affected by low extinction. It is catalogued as a very old 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 Very old

Data

🔍 Search references for HSC 2689 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–	254.438	-69.851	0.297	-3.912	-7.577	–
Hunt & Reffert	2024	254.439	-69.837	0.293	-3.861	-7.575	–
Hunt & Reffert	2023	254.439	-69.837	0.293	-3.861	-7.575	–

💡 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–	2.88	0.13	0.92	7396	–	72	–	–
Hunt & Reffert	2024	–	–	–	–	–	72⁽¹⁾	–	–
Hunt & Reffert	2023	2.88	0.13	0.92	7396	–	–	–	–

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

Visualization

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