HSC 2808

0.27 UTI

0.0

C_N

0.12

C_dens

0.75

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 19

Stellar density (N₅₀/rad) 0.6 [N/pc²]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.12 Very loose
C_C3 0.75 High 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 2808 is a sparse, very loose object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young 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 Moderate extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 244 along with HSC_2796.

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P489, along with HSC_2796.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 2808 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–	247.489	-45.012	0.568	-0.809	-0.717	–
Hunt & Reffert	2024	247.491	-45.018	0.558	-0.784	-0.686	–
Cavallo et al.	2024	247.408	-45.061	0.558	–	–	–
Hunt & Reffert	2023	247.491	-45.018	0.558	-0.784	-0.686	–

💡 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–	1.77	2.1	0.79	19	-0.060	225	–	–
Liu et al.	2025	4.76	0.81	–	20	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	225⁽¹⁾	–	–
Cavallo et al.	2024	1.77	2.27	–	15	-0.060	–	–	–
Hunt & Reffert	2023	1.68	2.10	0.79	19	–	–	–	–

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

Visualization

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