HSC 2691

0.37 UTI

0.29

C_N

0.69

C_dens

0.38

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 29

Stellar density (N₅₀/rad) 3.4 [N/pc²]

C3 classification BC

C_N 0.29 Poorly populated
C_dens 0.69 Moderately dense
C_C3 0.38 Low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 2691 is a poorly populated, moderately dense object of low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It was recently reported in the literature.

Close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P230, along with HSC_2708.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 2691 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–	230.628	-58.146	0.99	-1.586	-3.995	-10.537
Hu & Soubiran	2025	230.661	-58.122	–	–	–	–
Hunt & Reffert	2024	230.538	-58.168	0.989	-1.617	-4.018	-10.854
Cavallo et al.	2024	230.662	-58.122	0.991	–	–	–
Hunt & Reffert	2023	230.538	-58.168	0.989	-1.617	-4.018	-10.854

💡 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–	0.94	1.735	2.02	350	0.210	132	–	–
Hu & Soubiran	2025	–	–	–	–	-0.130⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	132⁽¹⁾	–	–
Cavallo et al.	2024	0.92	1.45	–	617	0.550	–	–	–
Hunt & Reffert	2023	0.96	2.02	2.02	84	–	–	–	–

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

Visualization

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