HSC 863

0.23 UTI

0.35

C_N

0.21

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 35

Core radius and density 1.8 [pc], 1.1 [pc^-2]

C3 classification DA

C_N 0.35 Poorly populated
C_dens 0.21 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 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 863 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a large distance, well above the mid-plane, affected by high extinction. It is catalogued as a metal-poor, intermediate-age cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

⚠️ 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 distant High extinction Metal-poor Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.09 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.09 (50th percentile).

Data

🔍 Search references for HSC 863 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–	340.907	64.195	0.137	-1.962	-1.67	-96.328
Hunt & Reffert	2024	340.908	64.194	0.131	-1.97	-1.683	-92.734
Cavallo et al.	2024	340.959	64.178	0.128	–	–	–
Hunt & Reffert	2023	340.908	64.194	0.131	-1.97	-1.683	-92.734

💡 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–	5.96	3.5	1.89	247	-0.690	686	–	–
Hunt & Reffert	2024	5.96	3.50	1.89	247	–	686⁽¹⁾	–	–
Cavallo et al.	2024	8.39	3.92	–	123	-0.690	–	–	–
Hunt & Reffert	2023	5.96	3.50	1.89	247	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 2940	100.0	340.9	64.19	0.14	-1.96	-1.67	-96.33	0.06

💡 Note: The % column shows the percentage of members that HSC 863 shares with each listed object.

Visualization

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