UPK 25

0.22 UTI

0.0

C_N

0.03

C_dens

0.5

C_C3

0.29

C_lit

1.0

C_dup

N_m (P>50%) 21

Core radius and density 2.0 [pc], 0.1 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.29 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

UPK 25 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is poorly studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Close Moderate 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: 0.93 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Data

🔍 Search references for UPK 25 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	267.87	-2.779	1.605	-0.277	0.219	-13.814
Li et al.	2025	267.878	-2.779	1.584	-0.346	0.218	–
Almeida et al.	2025	267.993	-2.804	–	–	–	–
Alfonso et al.	2024	268.416	-2.714	1.49	0.326	0.146	–
Cavallo et al.	2024	268.066	-2.681	1.596	–	–	–
Hunt & Reffert	2023	268.274	-2.725	1.596	-0.279	0.183	-18.921
Jadhav & Subramaniam	2021	267.878	-2.779	–	–	–	–
Dias et al.	2021	267.993	-2.804	1.553	-0.306	0.183	–
Cantat-Gaudin et al.	2020	267.878	-2.779	1.584	-0.346	0.218	–
Cantat-Gaudin & Anders	2020	267.899	-2.745	1.57	-0.323	0.283	–
Sim et al.	2019	268.092	-2.756	–	-0.31	0.19	–

💡 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	1.745	0.86	356	0.023	70	–	0
Li et al.	2025	0.56	1.73	–	592	0.029	–	–	–
Almeida et al.	2025	0.62	2.10	–	274	–	61	–	–
Alfonso et al.	2024	0.60	1.38	–	357	0.017	–	–	–
Cavallo et al.	2024	0.61	1.99	–	380	0.080	–	–	–
Hunt & Reffert	2023	0.59	1.76	0.86	473	–	–	–	–
Tarricq et al.	2022	0.59	–	–	355	–	–	–	–
Jadhav & Subramaniam	2021	0.60	1.38	–	355	–	78	–	0⁽¹⁾
Dias et al.	2021	0.62	2.10	–	274	0.017	–	–	–
Cantat-Gaudin et al.	2020	0.60	1.38	–	355	–	–	–	–
Cantat-Gaudin & Anders	2020	0.63	–	–	–	–	–	–	–
Sim et al.	2019	0.63	–	–	891	–	–	–	–

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

Visualization

ℹ️

1 2 3