UPK 431

0.70 UTI

0.5

C_N

0.86

C_dens

0.75

C_C3

0.7

C_lit

1.0

C_dup

N₅₀ (P>50% members) 50

Stellar density (N₅₀/rad) 4.3 [N/pc²]

C3 classification BA

C_N 0.5 Moderately populated
C_dens 0.86 Dense
C_C3 0.75 High quality
C_lit 0.7 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 431 is a moderately populated, dense object of high C3 quality. Its parallax locates it at a close distance, above 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 absorption and age parameters (see Parameters). It is moderately studied in the literature.

Close Low extinction Near-solar metallicity Intermediate age

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg60' along with UPK 42.9

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for UPK 431 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–	108.165	-2.61	1.363	-2.485	0.758	11.653
Li et al.	2025	108.234	-2.635	1.346	-2.46	0.76	–
Almeida et al.	2025	108.283	-2.761	–	–	–	–
Alfonso et al.	2024	108.232	-2.505	1.319	-2.431	0.709	–
Hunt & Reffert	2024	108.14	-2.567	1.348	-2.457	0.771	7.595
Cavallo et al.	2024	108.167	-2.726	1.356	–	–	–
Hunt & Reffert	2023	108.14	-2.567	1.348	-2.457	0.771	7.595
Almeida et al.	2023	108.285	-2.766	–	–	–	–
He et al.	2022	108.179	-2.599	1.366	-2.457	0.787	–
Tarricq et al.	2022	108.143	-2.608	1.362	-2.43	0.775	–
Dias et al.	2021	108.283	-2.761	1.342	-2.457	0.749	17.737
Cantat-Gaudin et al.	2020	108.234	-2.635	1.346	-2.46	0.76	–
Cantat-Gaudin & Anders	2020	108.239	-2.631	1.331	-2.454	0.751	–
Sim et al.	2019	108.186	-2.721	–	-2.44	0.77	–

💡 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–	0.73	0.17	0.6	233	-0.060	166	0.56	–
Li et al.	2025	0.91	0.17	–	212	-0.057	–	–	–
Almeida et al.	2025	0.73	0.25	–	233	–	166	–	–
Alfonso et al.	2024	0.74	0.00	–	593	-0.070	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	136⁽¹⁾	–	–
Cavallo et al.	2024	0.71	0.22	–	166	0.060	–	–	–
Hunt & Reffert	2023	0.69	0.14	0.60	426	–	–	–	–
Almeida et al.	2023	0.72	0.09	–	100	-0.060	258⁽¹⁾	0.56	–
He et al.	2022	–	0.30	–	178	–	–	–	–
Tarricq et al.	2022	0.75	–	–	617	–	–	–	–
Dias et al.	2021	0.73	0.25	–	233	-0.073	–	–	–
Cantat-Gaudin et al.	2020	0.77	0.00	–	603	–	–	–	–
Cantat-Gaudin & Anders	2020	0.74	–	–	–	–	–	–	–
Sim et al.	2019	0.73	–	–	501	–	–	–	–

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

Visualization

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