HSC 271

0.45 UTI

0.53

C_N

0.93

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 56

Core radius and density 1.2 [pc], 4.6 [pc^-2]

C3 classification AB

C_N 0.53 Moderately populated
C_dens 0.93 Very dense
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 271 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by very high extinction. It is catalogued as a massive, 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.

Relatively close Very high extinction Massive Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P483, along with UBC_107.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.59 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.59 (50th percentile).

Data

🔍 Search references for HSC 271 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–	279.001	-4.611	0.31	-0.989	-5.149	19.786
Hunt & Reffert	2024	279.004	-4.611	0.319	-1.008	-5.128	20.588
Cavallo et al.	2024	278.986	-4.593	0.318	–	–	–
Hunt & Reffert	2023	279.004	-4.611	0.319	-1.008	-5.128	20.588

💡 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–	2.71	5.05	2.24	442	-0.320	1523	–	–
Hunt & Reffert	2024	2.71	5.05	2.24	442	–	1523⁽¹⁾	–	–
Cavallo et al.	2024	3.72	5.14	–	200	-0.320	–	–	–
Hunt & Reffert	2023	2.71	5.05	2.24	442	–	–	–	–

(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 4211	94.6	279.0	-4.61	0.31	-0.99	-5.16	19.79	0.07

💡 Note: The % column shows the percentage of members that HSC 271 shares with each listed object.

Visualization

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