UPK 24

(OCSN 290)

0.43 UTI

0.34

C_N

0.13

C_dens

0.38

C_C3

0.65

C_lit

1.0

C_dup

N₅₀ (P>50% members) 34

Stellar density (N₅₀/rad) 0.7 [N/pc²]

C3 classification CB

C_N 0.34 Poorly populated
C_dens 0.13 Very loose
C_C3 0.38 Low 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 24 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close 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 and metallicity parameters (see Parameters). It is moderately studied in the literature.

Close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G136, along with HSC_189, UPK_20 and HSC_207.

Cavallo et al. (2024)
Gold sample.

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

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for UPK 24 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–	282.717	-10.717	1.963	-3.774	-9.906	-0.328
Li et al.	2025	282.646	-10.788	1.945	-3.751	-9.838	–
Almeida et al.	2025	282.565	-10.897	–	–	–	–
Alfonso et al.	2024	282.815	-10.846	1.921	-3.779	-9.817	–
Cavallo et al.	2024	282.604	-10.899	1.979	–	–	–
Hunt & Reffert	2023	281.879	-11.701	1.979	-3.798	-9.855	2.281
Almeida et al.	2023	282.549	-10.823	–	–	–	–
Qin et al.	2023	282.79	-10.62	1.97	-3.76	-9.91	-0.63
Tarricq et al.	2022	282.892	-12.085	1.964	-3.776	-9.811	–
Dias et al.	2021	282.565	-10.897	1.959	-3.764	-9.776	-0.798
Cantat-Gaudin et al.	2020	282.646	-10.788	1.945	-3.751	-9.838	–
Cantat-Gaudin & Anders	2020	282.673	-10.728	1.963	-3.755	-9.775	–
Sim et al.	2019	282.728	-10.697	–	-3.75	-9.79	–

💡 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–	0.5	1.12	2.11	545	-0.007	108	0.88	–
Li et al.	2025	0.48	0.90	–	841	-0.035	–	–	–
Almeida et al.	2025	0.50	1.12	–	1038	–	112	–	–
Alfonso et al.	2024	0.50	0.95	–	212	-0.007	–	–	–
Cavallo et al.	2024	0.52	1.56	–	380	0.120	–	–	–
Hunt & Reffert	2023	0.48	1.36	2.11	471	–	–	–	–
Almeida et al.	2023	0.50	1.35	–	545	-0.373	105⁽¹⁾	0.88	–
Qin et al.	2023	0.79	1.12	–	1122	–	–	–	–
Tarricq et al.	2022	0.50	–	–	282	–	–	–	–
Dias et al.	2021	0.50	1.12	–	1038	-0.007	–	–	–
Cantat-Gaudin et al.	2020	0.50	0.95	–	269	–	–	–	–
Cantat-Gaudin & Anders	2020	0.50	–	–	–	–	–	–	–
Sim et al.	2019	0.50	–	–	794	–	–	–	–

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

Visualization

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