HSC 1818

0.19 UTI

0.0

C_N

0.44

C_dens

0.5

C_C3

0.0

C_lit

1.0

C_dup

C3 classification BB

Number of members (P>50%) 23

Radius (P>50% members) 3.2 [arcmin]

C_N 0.0 Sparse
C_dens 0.44 Loose
C_C3 0.5 Intermediate quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 1818 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a moderate 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.

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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 1818 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	–	111.372	-15.644	0.289	-1.58	1.776	–
Hunt & Reffert	2024	111.376	-15.582	0.284	-1.583	1.797	–
Cavallo et al.	2024	111.364	-15.634	0.286	–	–	–
Hunt & Reffert	2023	111.376	-15.582	0.284	-1.583	1.797	–

💡 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]	Bfr	BSS
Hunt & Reffert	2024	–	–	–	–	–	271*	–	–
Cavallo et al.	2024	2.68	1.96	–	132	-0.430	–	–	–
Hunt & Reffert	2023	3.08	1.78	1.44	117	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3506	92.0	111.37	-15.65	0.3	-1.56	1.77	–	0.02

💡 Note: The % column shows the percentage of members that HSC 1818 shares with each listed object.

Visualization

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