UPK 33

0.65 UTI

0.66

C_N

1.0

C_dens

0.38

C_C3

0.6

C_lit

1.0

C_dup

N₅₀ (P>50% members) 81

Stellar density (N₅₀/rad) 10.8 [N/pc²]

C3 classification BC

C_N 0.66 Moderately populated
C_dens 1.0 Very dense
C_C3 0.38 Low quality
C_lit 0.6 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 33 is a moderately populated, very dense 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 parameter (see Parameters). It is moderately studied in the literature.

Close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P177, along with Theia_403.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for UPK 33 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–	280.089	-4.288	1.948	-0.059	-10.964	-9.056
Almeida et al.	2025	280.022	-4.329	–	–	–	–
Alfonso et al.	2024	280.085	-4.253	1.91	-0.075	-10.958	–
Hunt & Reffert	2024	280.117	-4.36	1.962	-0.075	-10.846	-3.669
Cavallo et al.	2024	280.056	-4.297	1.961	–	–	–
Hunt & Reffert	2023	280.117	-4.36	1.962	-0.075	-10.846	-3.669
Almeida et al.	2023	280.01	-4.362	–	–	–	–
Tarricq et al.	2022	280.043	-4.378	1.953	-0.003	-10.94	–
Dias et al.	2021	280.022	-4.329	1.935	-0.101	-10.932	-10.418
Cantat-Gaudin et al.	2020	280.046	-4.333	1.945	-0.124	-11.012	–
Cantat-Gaudin & Anders	2020	280.051	-4.285	1.931	-0.087	-10.888	–
Sim et al.	2019	280.042	-4.346	–	-0.13	-10.95	–

💡 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–	0.51	2.25	2.0	129	0.037	106	0.78	–
Almeida et al.	2025	0.51	2.25	–	71	–	78	–	–
Alfonso et al.	2024	0.52	1.64	–	223	0.042	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	152⁽¹⁾	–	–
Cavallo et al.	2024	0.52	2.38	–	129	0.020	–	–	–
Hunt & Reffert	2023	0.50	2.45	2.00	57	–	–	–	–
Almeida et al.	2023	0.50	2.19	–	107	0.032	106⁽¹⁾	0.78	–
Tarricq et al.	2022	0.52	–	–	295	–	–	–	–
Dias et al.	2021	0.51	2.25	–	71	0.042	–	–	–
Cantat-Gaudin et al.	2020	0.52	1.64	–	282	–	–	–	–
Cantat-Gaudin & Anders	2020	0.51	–	–	–	–	–	–	–
Sim et al.	2019	0.51	–	–	794	–	–	–	–

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

Visualization

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