HSC 821

0.17 UTI

0.26

C_N

0.45

C_dens

0.12

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 26

Stellar density (N₅₀/rad) 2.2 [N/pc²]

C3 classification DC

C_N 0.26 Poorly populated
C_dens 0.45 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 821 is a poorly populated, loose object of very 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 (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.

Close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 821 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–	338.251	57.33	0.992	-1.688	-1.838	-10.738
Hunt & Reffert	2024	338.248	57.319	0.964	-1.72	-1.879	-12.993
Cavallo et al.	2024	338.281	57.344	0.973	–	–	–
Hunt & Reffert	2023	338.248	57.319	0.964	-1.72	-1.879	-12.993

💡 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–	0.985	1.06	0.31	231	0.060	87	–	–
Hunt & Reffert	2024	–	–	–	–	–	87⁽¹⁾	–	–
Cavallo et al.	2024	0.99	1.21	–	224	0.060	–	–	–
Hunt & Reffert	2023	0.98	0.91	0.31	238	–	–	–	–

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

Visualization

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