UPK 90

0.72 UTI

0.43

C_N

1.0

C_dens

0.75

C_C3

0.7

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 43

Radius (P>50% members) 8.1 [arcmin]

C_N 0.43 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.7 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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UPK 90 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

Close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UPK 90 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	–	299.773	28.418	1.233	-0.835	-5.747	-14.868
Li et al.	2025	299.777	28.422	1.228	-0.824	-5.705	–
Almeida et al.	2025	299.741	28.424	–	–	–	–
Alfonso et al.	2024	299.734	28.418	1.2	-0.871	-5.646	–
Hunt & Reffert	2024	299.726	28.434	1.227	-0.837	-5.698	-13.589
Cavallo et al.	2024	299.769	28.437	1.236	–	–	–
Hunt & Reffert	2023	299.726	28.434	1.227	-0.837	-5.698	-13.589
He et al.	2022	299.76	28.437	1.244	-0.806	-5.734	–
Tarricq et al.	2022	299.765	28.457	1.242	-0.85	-5.752	–
Dias et al.	2021	299.741	28.424	1.236	-0.825	-5.728	–
Cantat-Gaudin et al.	2020	299.777	28.422	1.228	-0.824	-5.705	–
Cantat-Gaudin & Anders	2020	299.773	28.419	1.231	-0.837	-5.719	–
Sim et al.	2019	299.787	28.408	–	-0.83	-5.72	–

💡 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
Li et al.	2025	0.92	1.07	–	179	0.144	–	–	–
Almeida et al.	2025	0.79	0.96	–	385	–	123	–	–
Alfonso et al.	2024	0.79	0.85	–	101	0.075	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	110*	–	–
Cavallo et al.	2024	0.83	1.07	–	49	-0.070	–	–	–
Hunt & Reffert	2023	0.78	0.80	0.80	122	–	–	–	–
He et al.	2022	–	1.25	–	50	–	–	–	–
Tarricq et al.	2022	0.78	–	–	55	–	–	–	–
Dias et al.	2021	0.79	0.96	–	385	0.076	–	–	–
Cantat-Gaudin et al.	2020	0.79	0.85	–	49	–	–	–	–
Cantat-Gaudin & Anders	2020	0.79	–	–	–	–	–	–	–
Sim et al.	2019	0.79	–	–	45	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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