UPK 644

N_50

r_50

14.9

Summary

UPK 644 is a moderately populated, very dense object of high C3 quality. It is located at a close distance from the Sun, above the mid-plane. It is well-studied in the literature.

This object shares a large percentage of members with a later reported entry.

Search object in SciX | Simbad

Positions

Reference	RA	DEC	Plx	pmRA	pmDE	Rv
Sim et al. (2019)	249.111	-31.414	–	-3.94	-3.46	–
Cantat-Gaudin et al. (2020)	249.155	-31.418	1.313	-3.846	-3.458	–
Dias et al. (2021)	249.195	-31.52	1.3	-3.85	-3.444	-27.385
Tarricq et al. (2022)	249.138	-31.382	1.326	-3.909	-3.347	–
He et al. (2022)	249.152	-31.378	1.332	-3.916	-3.413	–
Hunt & Reffert (2023)	249.134	-31.338	1.344	-3.92	-3.346	-22.492
Cavallo et al. (2024)	249.523	-30.961	1.343	–	–	–
Hunt & Reffert (2024)	249.134	-31.338	1.344	-3.92	-3.346	-22.492
Alfonso et al. (2024)	249.236	-31.262	1.296	-3.875	-3.375	–
Almeida et al. (2025)	249.195	-31.52	–	–	–	–

UCC	249.156	-31.363	1.332	-3.87	-3.429	-28.935

Galactocentric position

How are the galactocentric plots generated?

Search coordinates in CDS | Simbad

Estimated members

1 2 3

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Fundamental parameters

Reference	Values
Sim et al. (2019)	`d_pc=742, log(age)=7.95`
Cantat-Gaudin et al. (2020)	`AVNN=0.34, DistPc=743.0, AgeNN=8.23`
Dias et al. (2021)	`Av=0.754, Dist=761, logage=8.546, [Fe/H]=-0.028`
Tarricq et al. (2022)	`Dist=730, logAgeNN=8.27`
He et al. (2022)	`A0=0.9, logAge=7.7`
Hunt & Reffert (2023)	`AV50=0.409, diffAV50=0.699, MOD50=9.243, logAge50=8.514`
Cavallo et al. (2024)	`AV50=0.78, dMod50=9.37, logAge50=8.22, [Fe/H]50=0.22`
Hunt & Reffert (2024)	`MassJ=121.502, MassTot=312.650`
Alfonso et al. (2024)	`AV=0.34049, MOD=9.35956, logAge=8.82810, Z=-0.0276`
Almeida et al. (2025)	`AV=0.754, Dist=761, logAge=8.546, MassRk=227.6`

Search coordinates in Bayestar19

Cluster region map

Objects with shared members

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 325	76.5	249.15	-31.39	1.33	-3.91	-3.44	-27.55	0.0