HSC 976

0.28 UTI

0.56

C_N

0.31

C_dens

0.75

C_C3

0.06

C_lit

0.8

C_dup

N_m (P>50%) 61

Core radius and density 1.2 [pc], 1.5 [pc^-2]

C3 classification AB

C_N 0.56 Moderately populated
C_dens 0.31 Loose
C_C3 0.75 High quality
C_lit 0.06 Rarely studied
C_dup 0.8 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 976 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Very young

Palma et al. (2025)
Classified as optical pair P408, along with HSC_1047.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Data

🔍 Search references for HSC 976 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–	343.738	78.444	6.001	18.562	5.914	-8.584
Yang et al.	2025	9.999	79.32	–	–	–	–
Swiggum et al.	2024	10.0	79.32	6.037	17.161	5.322	-9.375
Cavallo et al.	2024	338.584	76.801	6.037	–	–	–
Hunt & Reffert	2023	10.0	79.32	6.037	17.161	5.322	-9.005

💡 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–	0.16	0.555	0.88	14	0.095	180	–	–
Yang et al.	2025	–	–	–	14	-0.210⁽³⁾	–	–	–
Swiggum et al.	2024	0.16	–	–	13	–	180	–	–
Cavallo et al.	2024	0.16	0.79	–	51	0.400	–	–	–
Hunt & Reffert	2023	0.16	0.32	0.88	13	–	–	–	–

(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 1090	19.7	343.28	79.47	6.4	22.62	0.28	-8.77	0.33

💡 Note: The % column shows the percentage of members that HSC 976 shares with each listed object.

Visualization

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