UPK 540

(OCSN 313)

0.76 UTI

0.75

C_N

0.63

C_dens

1.0

C_C3

0.7

C_lit

1.0

C_dup

N₅₀ (P>50% members) 104

Stellar density (N₅₀/rad) 3.1 [N/pc²]

C3 classification AA

C_N 0.75 Rich
C_dens 0.63 Moderately dense
C_C3 1.0 Very 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 540 is a rich, moderately dense object of very high 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, young cluster (see Parameters). It is moderately studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 285 along with NGC_2516.

Palma et al. (2025)
Part of multiple system G247, along with UPK_545 and Theia_613.

Cavallo et al. (2024)
Gold sample.

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

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

Data

🔍 Search references for UPK 540 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–	114.668	-58.722	2.727	-4.857	7.754	6.804
Li et al.	2025	114.567	-58.609	2.688	-4.827	7.67	–
Almeida et al.	2025	114.535	-58.435	–	–	–	–
Alfonso et al.	2024	114.649	-58.711	2.71	-4.81	7.77	–
Cavallo et al.	2024	114.839	-58.81	2.719	–	–	–
Hunt & Reffert	2023	115.516	-58.662	2.718	-4.841	7.689	7.935
Qin et al.	2023	115.07	-58.65	2.71	-4.8	7.71	6.71
He et al.	2022	114.801	-58.752	2.743	-4.769	7.759	–
Dias et al.	2021	114.535	-58.435	2.663	-4.815	7.661	14.456
Spina et al.	2021	114.644	-58.652	2.698	-4.823	7.647	–
Cantat-Gaudin et al.	2020	114.567	-58.609	2.688	-4.827	7.67	–
Cantat-Gaudin & Anders	2020	114.614	-58.613	2.693	-4.921	7.663	–
Sim et al.	2019	114.693	-58.54	–	-4.82	7.66	–

💡 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–	0.365	0.435	0.47	31	-0.008	55	–	–
Liu et al.	2025	0.43	0.15	–	31	–	–	–	–
Li et al.	2025	0.36	0.44	–	29	0.049	–	–	–
Almeida et al.	2025	0.36	0.45	–	33	–	55	–	–
Alfonso et al.	2024	0.36	0.32	–	31	-0.008	–	–	–
Cavallo et al.	2024	0.38	0.68	–	9	-0.250	–	–	–
Hunt & Reffert	2023	0.36	0.25	0.47	20	–	–	–	–
Qin et al.	2023	0.43	0.43	–	28	–	–	–	–
He et al.	2022	–	0.50	–	28	–	–	–	–
Dias et al.	2021	0.36	0.45	–	33	-0.008	–	–	–
Spina et al.	2021	0.37	–	–	37	–	–	–	–
Cantat-Gaudin et al.	2020	0.36	0.32	–	37	–	–	–	–
Cantat-Gaudin & Anders	2020	0.37	–	–	–	–	–	–	–
Sim et al.	2019	0.37	–	–	32	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
HSC 2216	1.0	113.89	-60.6	3.51	-4.64	9.13	20.53	0.11

💡 Note: The % column shows the percentage of members that UPK 540 shares with each listed object.

Visualization

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