UPK 642

0.47 UTI

0.27

C_N

0.21

C_dens

0.75

C_C3

0.56

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 27

Radius (P>50% members) 17.9 [arcmin]

C_N 0.27 Poorly populated
C_dens 0.21 Very loose
C_C3 0.75 High quality
C_lit 0.56 Moderately studied
C_dup 1.0 Unique

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Overview

UPK 642 is a poorly populated, very loose object of 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, intermediate-age cluster (see Parameters). It is moderately studied in the literature.

Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024): Gold sample.

Data

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	263.081	-44.242	1.033	2.274	-4.324	9.611
Almeida et al.	2025	263.116	-44.28	–	–	–	–
Alfonso et al.	2024	263.15	-44.228	1.001	2.271	-4.384	–
Hunt & Reffert	2024	263.026	-44.321	1.025	2.268	-4.393	13.092
Cavallo et al.	2024	263.109	-44.216	1.031	–	–	–
Hunt & Reffert	2023	263.026	-44.321	1.025	2.268	-4.393	13.092
Dias et al.	2021	263.116	-44.28	1.024	2.345	-4.35	–
Cantat-Gaudin et al.	2020	263.081	-44.242	1.025	2.317	-4.331	–
Sim et al.	2019	263.089	-44.276	–	2.31	-4.29	–

💡 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]	Bfr	BSS
Almeida et al.	2025	0.94	0.45	–	124	–	86	–	–
Alfonso et al.	2024	0.92	0.27	–	200	0.210	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	58*	–	–
Cavallo et al.	2024	0.88	0.20	–	251	0.140	–	–	–
Hunt & Reffert	2023	0.92	0.39	0.79	100	–	–	–	–
Tarricq et al.	2022	0.89	–	–	170	–	–	–	–
Dias et al.	2021	0.94	0.45	–	124	0.210	–	–	–
Cantat-Gaudin et al.	2020	0.92	0.27	–	166	–	–	–	–
Sim et al.	2019	0.95	–	–	100	–	–	–	–

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
(*): indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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💡 Note: How are the galactocentric plots generated? See FAQ.