UPK 549

0.81 UTI

0.8

C_N

1.0

C_dens

0.75

C_C3

0.75

C_lit

1.0

C_dup

N₅₀ (P>50% members) 222

Stellar density (N₅₀/rad) 26.6 [N/pc²]

C3 classification AB

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 0.75 High 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 549 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is well-studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UPK 549 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–	146.464	-52.49	0.978	-1.65	-0.413	-4.495
Li et al.	2025	146.49	-52.49	0.96	-1.676	-0.439	–
Hu & Soubiran	2025	146.483	-52.477	–	–	–	–
Wei et al.	2025	146.494	-52.491	0.982	-1.652	-0.414	–
Almeida et al.	2025	146.496	-52.483	–	–	–	–
Hunt & Reffert	2024	146.483	-52.482	0.973	-1.649	-0.42	-5.823
Cavallo et al.	2024	146.483	-52.477	0.972	–	–	–
Hunt & Reffert	2023	146.483	-52.482	0.973	-1.649	-0.42	-5.823
He et al.	2022	146.482	-52.481	0.978	-1.661	-0.409	–
Tarricq et al.	2022	146.5	-52.49	0.981	-1.663	-0.408	–
Dias et al.	2021	146.496	-52.483	0.964	-1.663	-0.447	-4.075
Cantat-Gaudin et al.	2020	146.49	-52.49	0.96	-1.676	-0.439	–
Cantat-Gaudin & Anders	2020	146.486	-52.49	0.958	-1.687	-0.458	–
Sim et al.	2019	146.503	-52.497	–	-1.69	-0.43	–

💡 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–	1.0	1.375	1.65	954	0.123	742	0.64	–
Li et al.	2025	0.89	1.39	–	1083	-0.151	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.010⁽⁵⁾	–	–	–
Wei et al.	2025	1.33	1.03	–	912	0.500	742	0.64	–
Almeida et al.	2025	1.00	1.36	–	975	–	488	–	–
Hunt & Reffert	2024	–	–	–	–	–	778⁽¹⁾	–	–
Cavallo et al.	2024	0.99	1.42	–	776	0.170	–	–	–
Hunt & Reffert	2023	0.99	1.43	1.65	368	–	–	–	–
He et al.	2022	–	1.50	–	794	–	–	–	–
Tarricq et al.	2022	0.99	–	–	977	–	–	–	–
Dias et al.	2021	1.00	1.36	–	975	0.123	–	–	–
Cantat-Gaudin et al.	2020	1.01	0.80	–	933	–	–	–	–
Cantat-Gaudin & Anders	2020	1.01	–	–	–	–	–	–	–
Sim et al.	2019	1.01	–	–	1122	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 256	99.1	146.46	-52.49	0.98	-1.65	-0.41	-4.5	0.02
FoF 2236	90.1	146.46	-52.49	0.98	-1.65	-0.41	-4.43	0.0

💡 Note: The % column shows the percentage of members that UPK 549 shares with each listed object.

Visualization

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