UPK 537

0.21 UTI

0.0

C_N

0.04

C_dens

0.38

C_C3

0.32

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 1.7 [pc], 0.2 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.38 Low quality
C_lit 0.32 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 537 is a sparse, very loose object of low 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: intermediate fit. Isochrone match: good fit.

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 UPK 537 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–	126.846	-52.065	1.656	-6.659	7.74	16.587
Li et al.	2025	126.57	-52.113	1.652	-6.638	7.765	–
Almeida et al.	2025	126.645	-52.013	–	–	–	–
Alfonso et al.	2024	126.646	-51.705	1.619	-6.566	7.723	–
Swiggum et al.	2024	125.646	-51.569	1.637	-6.492	7.716	20.288
Cavallo et al.	2024	126.376	-51.726	1.64	–	–	–
Hunt & Reffert	2023	125.646	-51.569	1.637	-6.492	7.716	18.409
Almeida et al.	2023	126.879	-52.022	–	–	–	–
Tarricq et al.	2022	127.129	-52.308	1.659	-6.669	7.714	–
Dias et al.	2021	126.645	-52.013	1.655	-6.522	7.803	-3.864
Cantat-Gaudin et al.	2020	126.57	-52.113	1.652	-6.638	7.765	–
Cantat-Gaudin & Anders	2020	126.669	-52.05	1.649	-6.576	7.757	–
Sim et al.	2019	126.792	-51.97	–	-6.69	7.58	–

💡 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–	0.6	0.7	1.61	105	0.082	243	0.78	–
Li et al.	2025	0.52	0.33	–	284	-0.058	–	–	–
Almeida et al.	2025	0.59	0.71	–	105	–	108	–	–
Alfonso et al.	2024	0.63	0.54	–	224	0.082	–	–	–
Swiggum et al.	2024	0.60	–	–	62	–	288	–	–
Cavallo et al.	2024	0.63	0.89	–	41	0.390	–	–	–
Hunt & Reffert	2023	0.58	0.70	1.61	62	–	–	–	–
Almeida et al.	2023	0.59	0.70	–	222	0.053	243⁽¹⁾	0.78	–
Tarricq et al.	2022	0.62	–	–	234	–	–	–	–
Dias et al.	2021	0.59	0.71	–	105	0.082	–	–	–
Cantat-Gaudin et al.	2020	0.63	0.54	–	234	–	–	–	–
Cantat-Gaudin & Anders	2020	0.60	–	–	–	–	–	–	–
Sim et al.	2019	0.60	–	–	40	–	–	–	–

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

Visualization

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