UPK 542

0.33 UTI

0.26

C_N

0.1

C_dens

0.5

C_C3

0.39

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 2.3 [pc], 0.5 [pc^-2]

C3 classification BB

C_N 0.26 Poorly populated
C_dens 0.1 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.39 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 542 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is poorly studied in the literature.

Close Low extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for UPK 542 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–	134.121	-54.381	1.209	-4.871	2.651	26.58
Li et al.	2025	134.258	-54.303	1.198	-4.897	2.508	–
Hu & Soubiran	2025	134.141	-54.396	–	–	–	–
Almeida et al.	2025	134.113	-54.299	–	–	–	–
Alfonso et al.	2024	133.923	-54.6	1.152	-4.977	2.697	–
Hunt & Reffert	2024	134.24	-54.469	1.198	-4.909	2.747	25.18
Cavallo et al.	2024	134.141	-54.396	1.207	–	–	–
Hunt & Reffert	2023	134.24	-54.469	1.198	-4.909	2.747	25.18
Almeida et al.	2023	134.383	-54.267	–	–	–	–
Jadhav & Subramaniam	2021	134.258	-54.303	–	–	–	–
Dias et al.	2021	134.113	-54.299	1.222	-4.944	2.582	14.159
Cantat-Gaudin et al.	2020	134.258	-54.303	1.198	-4.897	2.508	–
Cantat-Gaudin & Anders	2020	134.169	-54.336	1.213	-4.977	2.607	–
Sim et al.	2019	134.108	-54.331	–	-4.87	2.56	–

💡 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–	0.81	0.565	0.33	612	-0.050	88	0.78	0
Li et al.	2025	1.01	0.84	–	672	0.051	–	–	–
Hu & Soubiran	2025	–	–	–	–	0.000⁽⁵⁾	–	–	–
Almeida et al.	2025	0.80	0.68	–	434	–	78	–	–
Alfonso et al.	2024	0.81	0.49	–	89	-0.050	–	–	–
Hunt & Reffert	2024	0.80	0.39	0.33	117	–	47⁽¹⁾	–	–
Cavallo et al.	2024	0.84	1.03	–	1380	-0.320	–	–	–
Hunt & Reffert	2023	0.80	0.39	0.33	117	–	–	–	–
Almeida et al.	2023	0.77	0.64	–	593	-0.229	99⁽¹⁾	0.78	–
Tarricq et al.	2022	0.79	–	–	631	–	–	–	–
Jadhav & Subramaniam	2021	0.81	0.49	–	631	–	125	–	0⁽¹⁾
Dias et al.	2021	0.80	0.68	–	434	-0.050	–	–	–
Cantat-Gaudin et al.	2020	0.81	0.49	–	631	–	–	–	–
Cantat-Gaudin & Anders	2020	0.81	–	–	–	–	–	–	–
Sim et al.	2019	0.83	–	–	631	–	–	–	–

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

Visualization

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