UPK 233

(OCSN 300)

0.28 UTI

0.39

C_N

0.06

C_dens

0.75

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 39

Core radius and density 4.9 [pc], 0.3 [pc^-2]

C3 classification AB

C_N 0.39 Poorly populated
C_dens 0.06 Very loose
C_C3 0.75 High quality
C_lit 0.1 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 233 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, young cluster (see Parameters). It is rarely studied in the literature.

Close Moderate extinction Metal-rich Young

Palma et al. (2025)
Classified as optical pair P587, along with Theia_713.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.83 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.83 (50th percentile).

Data

🔍 Search references for UPK 233 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–	356.567	71.765	2.056	6.826	0.679	-10.914
Cavallo et al.	2024	357.183	71.792	2.054	–	–	–
Hunt & Reffert	2023	357.651	71.575	2.058	6.824	0.638	-11.49
Qin et al.	2023	355.94	71.7	2.0	6.69	0.43	-11.06
He et al.	2022	356.681	71.815	2.052	6.793	0.682	–
Sim et al.	2019	357.319	71.781	–	6.89	0.69	–

💡 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	1.1	1.55	63	0.530	–	–	–
Cavallo et al.	2024	0.51	1.05	–	62	0.530	–	–	–
Hunt & Reffert	2023	0.47	1.13	1.55	74	–	–	–	–
Qin et al.	2023	0.78	1.07	–	63	–	–	–	–
He et al.	2022	–	1.55	–	40	–	–	–	–
Sim et al.	2019	0.49	–	–	79	–	–	–	–

Visualization

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