UPK 300

0.18 UTI

0.26

C_N

0.06

C_dens

0.38

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 2.8 [pc], 0.3 [pc^-2]

C3 classification CB

C_N 0.26 Poorly populated
C_dens 0.06 Very loose
C_C3 0.38 Low quality
C_lit 0.1 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

ℹ️

UPK 300 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Close Moderate extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Data

🔍 Search references for UPK 300 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	57.759	60.121	1.052	0.185	-0.824	-9.115
Yang et al.	2025	57.408	60.146	–	–	–	–
Hunt & Reffert	2024	57.408	60.146	1.059	0.207	-0.768	-8.096
Cavallo et al.	2024	57.94	60.06	1.054	–	–	–
Hunt & Reffert	2023	57.408	60.146	1.059	0.207	-0.768	-8.096
Sim et al.	2019	58.02	59.983	–	0.25	-0.75	–

💡 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]	B_frac	BSS
UCC	99999–	0.93	2.46	1.23	62	-0.365	87	–	–
Yang et al.	2025	–	–	–	63	-0.110⁽³⁾	–	–	–
Hunt & Reffert	2024	0.91	2.46	1.23	62	–	87⁽¹⁾	–	–
Cavallo et al.	2024	0.95	2.81	–	21	-0.620	–	–	–
Hunt & Reffert	2023	0.91	2.46	1.23	62	–	–	–	–
Sim et al.	2019	0.96	–	–	398	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

ℹ️

1 2