UPK 305

(OCSN 303)

0.46 UTI

0.0

C_N

0.28

C_dens

0.5

C_C3

0.75

C_lit

1.0

C_dup

N₅₀ (P>50% members) 24

Stellar density (N₅₀/rad) 1.4 [N/pc²]

C3 classification DA

C_N 0.0 Sparse
C_dens 0.28 Loose
C_C3 0.5 Intermediate quality
C_lit 0.75 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 305 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a very close distance, below 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 age parameter (see Parameters). It is well-studied in the literature.

Very close Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for UPK 305 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–	40.433	38.926	2.458	2.893	-6.571	-0.166
Li et al.	2025	41.127	39.027	2.391	2.979	-6.525	–
Almeida et al.	2025	41.051	38.922	–	–	–	–
Alfonso et al.	2024	41.024	38.822	2.415	2.869	-6.605	–
Zhang et al.	2024	41.16	38.893	–	–	–	–
Cavallo et al.	2024	40.826	38.718	2.45	–	–	–
Hunt & Reffert	2023	41.16	38.893	2.423	2.845	-6.589	1.424
Qin et al.	2023	40.79	38.82	2.45	2.92	-6.58	1.93
He et al.	2022	40.935	38.839	2.463	2.893	-6.575	–
Tarricq et al.	2022	41.006	38.926	2.444	2.841	-6.55	–
Dias et al.	2021	41.051	38.922	2.406	2.94	-6.569	4.197
Spina et al.	2021	41.121	39.006	2.394	2.979	-6.494	–
Cantat-Gaudin et al.	2020	41.127	39.027	2.391	2.979	-6.525	–
Cantat-Gaudin & Anders	2020	41.115	39.027	2.391	2.982	-6.538	–
Sim et al.	2019	40.486	38.974	–	2.96	-6.5	–

💡 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–	0.41	0.17	0.39	117	0.007	85	–	–
Li et al.	2025	0.54	0.50	–	93	0.050	–	–	–
Almeida et al.	2025	0.41	0.15	–	735	–	85	–	–
Alfonso et al.	2024	0.41	0.12	–	79	-0.018	–	–	–
Zhang et al.	2024	–	–	–	–	0.007⁽¹⁾	–	–	–
Cavallo et al.	2024	0.41	0.40	–	79	0.180	–	–	–
Hunt & Reffert	2023	0.39	0.17	0.39	218	–	–	–	–
Qin et al.	2023	0.47	0.37	–	71	–	–	–	–
He et al.	2022	–	0.25	–	63	–	–	–	–
Tarricq et al.	2022	0.40	–	–	151	–	–	–	–
Dias et al.	2021	0.41	0.15	–	735	-0.018	–	–	–
Spina et al.	2021	0.42	–	–	141	–	–	–	–
Cantat-Gaudin et al.	2020	0.41	0.12	–	141	–	–	–	–
Cantat-Gaudin & Anders	2020	0.41	–	–	–	–	–	–	–
Sim et al.	2019	0.41	–	–	89	–	–	–	–

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

Visualization

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