UPK 137

0.36 UTI

0.33

C_N

0.22

C_dens

0.75

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 33

Core radius and density 1.2 [pc], 1.1 [pc^-2]

C3 classification AB

C_N 0.33 Poorly populated
C_dens 0.22 Very loose
C_C3 0.75 High quality
C_lit 0.26 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 137 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 349 along with Theia_199.

Palma et al. (2025)
Classified as optical pair P572, along with Theia_199.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for UPK 137 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–	306.028	54.102	1.174	-2.292	-6.083	-17.255
Almeida et al.	2025	305.995	54.114	–	–	–	–
Alfonso et al.	2024	305.981	54.381	1.13	-2.613	-6.119	–
Cavallo et al.	2024	306.076	54.195	1.175	–	–	–
Hunt & Reffert	2023	306.272	54.391	1.175	-2.312	-6.08	-13.364
Dias et al.	2021	305.995	54.114	1.155	-2.31	-6.061	–
Cantat-Gaudin et al.	2020	306.015	54.152	1.166	-2.289	-6.064	–
Cantat-Gaudin & Anders	2020	305.97	54.131	1.165	-2.297	-6.006	–
Sim et al.	2019	305.978	54.161	–	-2.34	-6.04	–

💡 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–	0.83	0.35	0.44	79	0.006	70	–	–
Liu et al.	2025	0.88	0.12	–	65	–	–	–	–
Almeida et al.	2025	0.83	0.39	–	171	–	70	–	–
Alfonso et al.	2024	0.81	0.35	–	90	0.006	–	–	–
Cavallo et al.	2024	0.86	0.38	–	79	0.490	–	–	–
Hunt & Reffert	2023	0.82	0.17	0.44	86	–	–	–	–
Tarricq et al.	2022	0.83	–	–	63	–	–	–	–
Dias et al.	2021	0.83	0.39	–	171	0.006	–	–	–
Cantat-Gaudin et al.	2020	0.81	0.35	–	51	–	–	–	–
Cantat-Gaudin & Anders	2020	0.84	–	–	–	–	–	–	–
Sim et al.	2019	0.84	–	–	32	–	–	–	–

Visualization

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