HSC 1709

0.13 UTI

0.25

C_N

0.28

C_dens

0.12

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 1.4 [N/pc²]

C3 classification DC

C_N 0.25 Poorly populated
C_dens 0.28 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 1709 is a poorly populated, loose object of very low 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, intermediate-age cluster, but with a large variance across recent sources for the metallicity 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.

Very close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P266, along with ASCC_24.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 1709 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–	92.739	-8.343	4.774	-0.987	-20.947	25.553
Zhang et al.	2024	93.09	-8.811	–	–	–	–
Cavallo et al.	2024	92.79	-8.804	4.783	–	–	–
Hunt & Reffert	2023	93.09	-8.811	4.787	-1.118	-20.898	6.917

💡 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–	0.21	0.55	0.6	295	0.165	–	–	–
Zhang et al.	2024	–	–	–	–	-0.001⁽¹⁾	–	–	–
Cavallo et al.	2024	0.21	0.70	–	316	0.330	–	–	–
Hunt & Reffert	2023	0.21	0.40	0.60	274	–	–	–	–

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

Visualization

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