HSC 2040

0.24 UTI

0.31

C_N

0.27

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 31

Core radius and density 1.5 [pc], 1.3 [pc^-2]

C3 classification BB

C_N 0.31 Poorly populated
C_dens 0.27 Loose
C_C3 0.5 Intermediate quality
C_lit 0.06 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 2040 is a poorly populated, loose object of intermediate C3 quality. Its parallax locates it at a large distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (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 Moderate extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.16 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.16 (50th percentile).

Data

🔍 Search references for HSC 2040 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–	122.585	-36.87	0.128	-2.205	2.644	91.976
Hu & Soubiran	2025	122.567	-36.872	–	–	–	–
Hunt & Reffert	2024	122.583	-36.869	0.138	-2.183	2.654	88.291
Cavallo et al.	2024	122.567	-36.872	0.14	–	–	–
Hunt & Reffert	2023	122.583	-36.869	0.138	-2.183	2.654	88.291

💡 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–	5.8	2.52	2.12	99	-0.195	530	–	–
Hu & Soubiran	2025	–	–	–	–	-0.200⁽⁵⁾	–	–	–
Hunt & Reffert	2024	5.80	2.52	2.12	99	–	530⁽¹⁾	–	–
Cavallo et al.	2024	4.99	2.13	–	851	-0.190	–	–	–
Hunt & Reffert	2023	5.80	2.52	2.12	99	–	–	–	–

(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 3291	90.3	122.58	-36.87	0.13	-2.21	2.66	88.28	0.02

💡 Note: The % column shows the percentage of members that HSC 2040 shares with each listed object.

Visualization

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