UPK 442

0.47 UTI

0.73

C_N

0.06

C_dens

1.0

C_C3

0.29

C_lit

1.0

C_dup

N_m (P>50%) 96

Core radius and density 7.2 [pc], 0.3 [pc^-2]

C3 classification AA

C_N 0.73 Moderately populated
C_dens 0.06 Very loose
C_C3 1.0 Very high quality
C_lit 0.29 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 442 is a moderately populated, very loose object of very high C3 quality. Its parallax locates it at a close distance, below 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 age and metallicity parameters (see Parameters). It is poorly studied in the literature.

Close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.31 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.31 (50th percentile).

Data

🔍 Search references for UPK 442 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–	98.163	-11.77	1.579	-2.575	-1.358	22.394
Otto et al.	2026	97.852	-12.557	–	-2.58	-1.32	30.7
Li et al.	2025	98.4	-11.549	1.558	-2.58	-1.322	–
Almeida et al.	2025	98.601	-11.806	–	–	–	–
Alfonso et al.	2024	98.23	-12.045	1.536	-2.523	-1.381	–
Cavallo et al.	2024	98.203	-11.98	1.549	–	–	–
Hunt & Reffert	2023	97.852	-12.557	1.539	-2.551	-1.34	20.99
Tarricq et al.	2022	98.026	-11.388	1.597	-2.561	-1.394	–
Dias et al.	2021	98.601	-11.806	1.512	-2.562	-1.315	26.227
Cantat-Gaudin et al.	2020	98.4	-11.549	1.558	-2.58	-1.322	–
Cantat-Gaudin & Anders	2020	98.406	-11.705	1.516	-2.569	-1.294	–
Sim et al.	2019	98.484	-11.755	–	-2.54	-1.32	–

💡 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–	0.645	0.34	1.26	84	-0.152	170	–	–
Otto et al.	2026	–	–	–	170	-0.380⁽¹⁵⁾	–	–	–
Li et al.	2025	0.66	0.34	–	82	-0.044	–	–	–
Almeida et al.	2025	0.65	0.54	–	85	–	170	–	–
Alfonso et al.	2024	0.62	0.26	–	43	-0.152	–	–	–
Cavallo et al.	2024	0.68	0.45	–	12	0.140	–	–	–
Hunt & Reffert	2023	0.61	0.22	1.26	68	–	–	–	–
Tarricq et al.	2022	0.61	–	–	178	–	–	–	–
Dias et al.	2021	0.65	0.54	–	85	-0.152	–	–	–
Cantat-Gaudin et al.	2020	0.62	0.26	–	170	–	–	–	–
Cantat-Gaudin & Anders	2020	0.65	–	–	–	–	–	–	–
Sim et al.	2019	0.64	–	–	50	–	–	–	–

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

Visualization

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