HSC 2781

0.22 UTI

0.0

C_N

0.3

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 1.1 [pc], 1.5 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.3 Loose
C_C3 0.75 High 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 2781 is a sparse, loose object of high 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.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for HSC 2781 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–	249.48	-49.524	0.428	-0.113	-2.221	-54.096
Hunt & Reffert	2024	249.477	-49.529	0.421	-0.119	-2.214	-54.102
Cavallo et al.	2024	249.471	-49.529	0.42	–	–	–
Hunt & Reffert	2023	249.477	-49.529	0.421	-0.119	-2.214	-54.102

💡 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–	2.22	2.77	1.27	123	-0.140	295	–	–
Hunt & Reffert	2024	2.22	2.77	1.27	123	–	295⁽¹⁾	–	–
Cavallo et al.	2024	2.13	2.85	–	170	-0.140	–	–	–
Hunt & Reffert	2023	2.22	2.77	1.27	123	–	–	–	–

(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 3411	100.0	249.47	-49.52	0.43	-0.12	-2.23	-54.1	0.02

💡 Note: The % column shows the percentage of members that HSC 2781 shares with each listed object.

Visualization

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