HSC 1981

0.00 UTI

0.75

C_N

0.73

C_dens

1.0

C_C3

0.03

C_lit

0.0

C_dup

N_m (P>50%) 100

Core radius and density 1.8 [pc], 3.7 [pc^-2]

C3 classification AA

C_N 0.75 Rich
C_dens 0.73 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.03 Rarely studied
C_dup 0.0 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 1981 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is very likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Intermediate age

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 1981 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–	118.952	-29.473	0.262	-2.629	2.935	78.743
Hunt & Reffert	2024	118.954	-29.474	0.257	-2.62	2.942	70.42
Cavallo et al.	2024	118.948	-29.474	0.261	–	–	–
Hunt & Reffert	2023	118.954	-29.474	0.257	-2.62	2.942	70.42

💡 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–	3.36	1.92	1.95	169	0.050	920	–	–
Hunt & Reffert	2024	3.36	1.92	1.95	169	–	920⁽¹⁾	–	–
Cavallo et al.	2024	3.24	2.14	–	20	0.050	–	–	–
Hunt & Reffert	2023	3.36	1.92	1.95	169	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FoF 201	100.0	118.96	-29.47	0.25	-2.62	2.93	70.43	0.53

💡 Note: The % column shows the percentage of members that HSC 1981 shares with each listed object.

Visualization

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