UPK 121

0.17 UTI

0.27

C_N

0.05

C_dens

0.38

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 27

Core radius and density 3.6 [pc], 0.3 [pc^-2]

C3 classification BC

C_N 0.27 Poorly populated
C_dens 0.05 Very loose
C_C3 0.38 Low quality
C_lit 0.06 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 121 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by high extinction. It is catalogued as a metal-rich, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Close High extinction Metal-rich Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.04 (50th percentile), false positive? (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.04 (50th percentile), false positive? (human-assigned).

Data

🔍 Search references for UPK 121 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–	313.747	41.28	1.03	0.565	-1.888	-0.441
Hunt & Reffert	2024	313.582	41.253	0.993	0.525	-1.935	1.686
Cavallo et al.	2024	313.653	41.314	0.998	–	–	–
Hunt & Reffert	2023	313.582	41.253	0.993	0.525	-1.935	1.686
Sim et al.	2019	313.776	41.316	–	0.57	-1.87	–

💡 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–	0.96	3.23	2.49	134	0.630	128	–	–
Hunt & Reffert	2024	0.96	3.23	2.49	49	–	128⁽¹⁾	–	–
Cavallo et al.	2024	1.15	2.89	–	219	0.630	–	–	–
Hunt & Reffert	2023	0.96	3.23	2.49	49	–	–	–	–
Sim et al.	2019	0.95	–	–	891	–	–	–	–

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

Visualization

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