HSC 1976

0.17 UTI

0.0

C_N

0.04

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 21

Core radius and density 3.4 [pc], 0.2 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.04 Very 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 1976 is a sparse, very loose object of high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young 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.

Distant Low extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for HSC 1976 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–	120.453	-27.554	0.197	-2.533	3.2	–
Hunt & Reffert	2024	120.419	-27.552	0.199	-2.527	3.176	–
Cavallo et al.	2024	120.471	-27.562	0.198	–	–	–
Hunt & Reffert	2023	120.419	-27.552	0.199	-2.527	3.176	–

💡 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–	4.26	0.68	0.47	21	-0.250	188	–	–
Hunt & Reffert	2024	4.26	0.68	0.47	21	–	188⁽¹⁾	–	–
Cavallo et al.	2024	3.56	0.91	–	22	-0.250	–	–	–
Hunt & Reffert	2023	4.26	0.68	0.47	21	–	–	–	–

(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 3689	96.0	120.45	-27.55	0.19	-2.53	3.2	–	0.02

💡 Note: The % column shows the percentage of members that HSC 1976 shares with each listed object.

Visualization

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