UPK 28

N_50

r_50

8.2

Summary

UPK 28 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 2 later reported entries.

Search object in SciX | Simbad

Positions

Reference	RA	DEC	Plx	pmRA	pmDE	Rv
Sim et al. (2019)	277.358	-4.987	–	0.81	-2.49	–
Cantat-Gaudin et al. (2020)	277.352	-4.974	1.109	0.772	-2.511	–
Dias et al. (2021)	277.359	-4.984	1.1	0.778	-2.504	–
Tarricq et al. (2022)	277.346	-4.977	1.089	0.871	-2.558	–
He et al. (2022)	277.36	-4.977	1.09	0.857	-2.559	–
Hunt & Reffert (2023)	277.362	-4.982	1.11	0.827	-2.589	10.616
Cavallo et al. (2024)	277.367	-4.97	1.105	–	–	–
Hunt & Reffert (2024)	277.362	-4.982	1.11	0.827	-2.589	10.616
Alfonso et al. (2024)	276.816	-5.789	0.913	0.613	-2.32	–
Almeida et al. (2025)	277.359	-4.984	–	–	–	–

UCC	277.352	-4.977	1.093	0.807	-2.555	-6.135

Galactocentric position

How are the galactocentric plots generated?

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Estimated members

1 2 3

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Fundamental parameters

Reference	Values
Sim et al. (2019)	`d_pc=882, log(age)=8.9`
Cantat-Gaudin et al. (2020)	`AVNN=2.88, DistPc=927.0, AgeNN=8.22`
Dias et al. (2021)	`Av=3.131, Dist=840, logage=7.619, [Fe/H]=0.351`
Tarricq et al. (2022)	`Dist=906, logAgeNN=8.28`
He et al. (2022)	`A0=4.0, logAge=7.45`
Hunt & Reffert (2023)	`AV50=3.705, diffAV50=2.023, MOD50=9.701, logAge50=7.73`
Cavallo et al. (2024)	`AV50=3.74, dMod50=9.99, logAge50=7.46, [Fe/H]50=0.23`
Hunt & Reffert (2024)	`MassJ=469.089, MassTot=471.135`
Alfonso et al. (2024)	`AV=2.87981, MOD=9.84008, logAge=8.19745, Z=0.35094`
Almeida et al. (2025)	`AV=3.131, Dist=840, logAge=7.619, MassRk=269.3`

Search coordinates in Bayestar19

Cluster region map

Objects with shared members

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 351	100.0	277.36	-4.99	1.09	0.8	-2.56	-7.46	0.14
CWWDL 14201	60.9	277.35	-4.97	1.09	0.8	-2.55	-7.28	0.0