HSC 1927

0.21 UTI

0.26

C_N

0.19

C_dens

0.38

C_C3

0.12

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 2.2 [pc], 0.9 [pc^-2]

C3 classification BC

C_N 0.26 Poorly populated
C_dens 0.19 Very loose
C_C3 0.38 Low quality
C_lit 0.12 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 1927 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption 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.

Distant Low extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).

Data

🔍 Search references for HSC 1927 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–	111.801	-27.172	0.231	-1.694	3.644	82.884
Hu & Soubiran	2025	111.826	-27.17	–	–	–	–
Hunt & Reffert	2024	111.803	-27.179	0.233	-1.689	3.585	82.845
Cavallo et al.	2024	111.826	-27.17	0.225	–	–	–
Hunt & Reffert	2023	111.803	-27.179	0.233	-1.689	3.585	82.845

💡 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–	3.89	0.27	0.81	3219	-0.360	218	–	–
Hu & Soubiran	2025	–	–	–	–	-0.400⁽⁵⁾	–	–	–
Hunt & Reffert	2024	3.89	0.27	0.81	3219	–	218⁽¹⁾	–	–
Cavallo et al.	2024	4.55	1.49	–	1349	-0.320	–	–	–
Hunt & Reffert	2023	3.89	0.27	0.81	3221	–	–	–	–

(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 2986	92.3	111.8	-27.18	0.24	-1.69	3.64	82.88	0.01

💡 Note: The % column shows the percentage of members that HSC 1927 shares with each listed object.

Visualization

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