UPK 535

(OCSN 312)

0.70 UTI

0.75

C_N

1.0

C_dens

1.0

C_C3

0.39

C_lit

1.0

C_dup

N₅₀ (P>50% members) 102

Stellar density (N₅₀/rad) 6.0 [N/pc²]

C3 classification AA

C_N 0.75 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.39 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 535 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption, age, and metallicity parameters (see Parameters). It is poorly studied in the literature.

Very close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P293, along with CWNU_1134.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for UPK 535 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–	126.935	-50.797	3.113	-12.906	3.281	10.7
Li et al.	2025	127.025	-50.899	3.086	-12.913	3.217	–
Wei et al.	2025	127.503	-50.597	3.06	-12.75	3.166	–
Almeida et al.	2025	127.112	-50.941	–	–	–	–
Alfonso et al.	2024	126.874	-50.76	3.081	-12.916	3.318	–
Swiggum et al.	2024	126.568	-50.083	3.15	-13.025	3.345	9.557
Cavallo et al.	2024	126.734	-50.645	3.148	–	–	–
Hunt & Reffert	2023	126.568	-50.083	3.15	-13.025	3.345	3.91
Almeida et al.	2023	127.427	-50.858	–	–	–	–
Qin et al.	2023	126.88	-50.66	3.12	-12.72	3.34	10.06
He et al.	2022	127.025	-50.782	3.147	-12.986	3.317	–
Dias et al.	2021	127.112	-50.941	3.084	-12.932	3.176	11.303
Cantat-Gaudin et al.	2020	127.025	-50.899	3.086	-12.913	3.217	–
Cantat-Gaudin & Anders	2020	127.042	-50.896	3.095	-12.955	3.173	–
Sim et al.	2019	127.06	-51.092	–	-13.08	3.25	–

💡 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–	0.32	0.28	0.47	32	-0.029	122	0.57	–
Li et al.	2025	0.38	0.23	–	38	0.050	–	–	–
Wei et al.	2025	0.32	0.61	–	6	-0.250	124	0.66	–
Almeida et al.	2025	0.32	0.33	–	43	–	120	–	–
Alfonso et al.	2024	0.32	0.07	–	26	-0.029	–	–	–
Swiggum et al.	2024	0.32	–	–	22	–	96	–	–
Cavallo et al.	2024	0.32	0.58	–	17	-0.090	–	–	–
Hunt & Reffert	2023	0.31	0.14	0.47	22	–	–	–	–
Almeida et al.	2023	0.32	0.25	–	53	0.056	209⁽¹⁾	0.48	–
Qin et al.	2023	0.35	0.28	–	25	–	–	–	–
He et al.	2022	–	0.40	–	32	–	–	–	–
Dias et al.	2021	0.32	0.33	–	43	-0.029	–	–	–
Cantat-Gaudin et al.	2020	0.32	0.07	–	33	–	–	–	–
Cantat-Gaudin & Anders	2020	0.32	–	–	–	–	–	–	–
Sim et al.	2019	0.32	–	–	45	–	–	–	–

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

Visualization

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