UPK 23

0.59 UTI

0.38

C_N

0.52

C_dens

0.75

C_C3

0.65

C_lit

1.0

C_dup

N₅₀ (P>50% members) 38

Stellar density (N₅₀/rad) 2.6 [N/pc²]

C3 classification AB

C_N 0.38 Poorly populated
C_dens 0.52 Moderately dense
C_C3 0.75 High quality
C_lit 0.65 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 23 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a close distance, below 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 and metallicity parameters (see Parameters). It is moderately studied in the literature.

Close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for UPK 23 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–	282.175	-12.904	1.004	-0.941	-2.13	8.437
Li et al.	2025	282.218	-12.879	1.021	-0.913	-2.127	–
Almeida et al.	2025	282.224	-12.868	–	–	–	–
Alfonso et al.	2024	282.186	-12.854	0.946	-0.93	-2.134	–
Hunt & Reffert	2024	282.2	-12.883	0.979	-0.972	-2.169	-16.227
Cavallo et al.	2024	282.221	-12.87	0.984	–	–	–
Hunt & Reffert	2023	282.2	-12.883	0.979	-0.972	-2.169	-16.227
Almeida et al.	2023	282.257	-12.862	–	–	–	–
Dias et al.	2021	282.224	-12.868	1.009	-0.918	-2.094	–
Cantat-Gaudin et al.	2020	282.218	-12.879	1.021	-0.913	-2.127	–
Cantat-Gaudin & Anders	2020	282.216	-12.865	1.002	-0.931	-2.088	–
Sim et al.	2019	282.21	-12.885	–	-0.9	-2.08	–

💡 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–	0.95	1.23	1.03	136	0.251	121	0.74	–
Li et al.	2025	0.81	1.12	–	322	-0.063	–	–	–
Almeida et al.	2025	0.95	1.53	–	29	–	83	–	–
Alfonso et al.	2024	0.97	1.11	–	183	0.251	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	121⁽¹⁾	–	–
Cavallo et al.	2024	1.01	1.04	–	269	0.580	–	–	–
Hunt & Reffert	2023	0.94	1.34	1.03	155	–	–	–	–
Almeida et al.	2023	0.95	1.50	–	116	-0.219	146⁽¹⁾	0.74	–
Tarricq et al.	2022	0.95	–	–	117	–	–	–	–
Dias et al.	2021	0.95	1.53	–	29	0.251	–	–	–
Cantat-Gaudin et al.	2020	0.97	1.11	–	110	–	–	–	–
Cantat-Gaudin & Anders	2020	0.97	–	–	–	–	–	–	–
Sim et al.	2019	0.95	–	–	355	–	–	–	–

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

Visualization

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