HSC 1954

0.17 UTI

0.27

C_N

0.06

C_dens

0.38

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 27

Core radius and density 3.0 [pc], 0.3 [pc^-2]

C3 classification CB

C_N 0.27 Poorly populated
C_dens 0.06 Very loose
C_C3 0.38 Low 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

ℹ️

HSC 1954 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a large distance, near the mid-plane, affected by low 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.

Very distant Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.30 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.30 (50th percentile).

Data

🔍 Search references for HSC 1954 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	117.991	-26.82	0.165	-1.657	2.2	91.228
Hu & Soubiran	2025	118.031	-26.81	–	–	–	–
Hunt & Reffert	2024	117.97	-26.798	0.166	-1.667	2.195	91.721
Cavallo et al.	2024	118.031	-26.81	0.168	–	–	–
Hunt & Reffert	2023	117.97	-26.798	0.166	-1.667	2.195	91.721

💡 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–	5.45	0.92	2.18	624	-0.085	433	–	–
Hu & Soubiran	2025	–	–	–	–	-0.210⁽⁵⁾	–	–	–
Hunt & Reffert	2024	5.45	0.92	2.18	623	–	433⁽¹⁾	–	–
Cavallo et al.	2024	4.13	0.55	–	1622	0.040	–	–	–
Hunt & Reffert	2023	5.45	0.92	2.18	624	–	–	–	–

(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 2980	100.0	118.0	-26.82	0.17	-1.66	2.2	91.23	0.02

💡 Note: The % column shows the percentage of members that HSC 1954 shares with each listed object.

Visualization

ℹ️

1 2