UPK 20

(OCSN 289)

N_50

r_50

27.0

Summary

UPK 20 is a moderately populated, very dense object of high C3 quality. It is located at a very close distance from the Sun, near the mid-plane. It is well-studied in the literature.

This object shares a moderate 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)	281.133	-14.476	–	3.32	1.14	–
Cantat-Gaudin et al. (2020)	281.145	-14.456	2.105	3.336	1.145	–
Dias et al. (2021)	281.151	-14.536	2.102	3.32	1.18	–
Tarricq et al. (2022)	281.081	-14.283	2.106	3.307	1.052	–
Qin et al. (2023)	281.13	-14.43	2.1	3.42	1.07	-7.27
Hunt & Reffert (2023)	281.119	-14.374	2.123	3.339	1.058	-6.945
Cavallo et al. (2024)	281.114	-14.551	2.127	–	–	–
Hunt & Reffert (2024)	281.119	-14.374	2.123	3.339	1.058	-6.945
Alfonso et al. (2024)	281.156	-14.491	2.071	3.329	1.083	–
Almeida et al. (2025)	281.151	-14.536	–	–	–	–

UCC	281.105	-14.456	2.12	3.343	1.051	-6.574

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=472, log(age)=8.8`
Cantat-Gaudin et al. (2020)	`AVNN=0.96, DistPc=494.0, AgeNN=9.33`
Dias et al. (2021)	`Av=1.638, Dist=465, logage=8.67, [Fe/H]=0.191`
Tarricq et al. (2022)	`Dist=490, logAgeNN=9.35`
Qin et al. (2023)	`E(B-V)=0.75, m-M=10.45, logt=8.15`
Hunt & Reffert (2023)	`AV50=1.875, diffAV50=2.497, MOD50=8.254, logAge50=8.163`
Cavallo et al. (2024)	`AV50=2.01, dMod50=8.45, logAge50=8.16, [Fe/H]50=0.27`
Hunt & Reffert (2024)	`MassJ=178.630, MassTot=252.501`
Alfonso et al. (2024)	`AV=0.95967, MOD=8.46991, logAge=9.06948, Z=0.19091`
Almeida et al. (2025)	`AV=1.638, Dist=465, logAge=8.67, MassRk=149.7`

Search coordinates in Bayestar19

Cluster region map

Objects with shared members

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 14605	41.7	281.16	-14.44	2.12	3.31	1.04	-7.39	0.0