UPK 438

0.15 UTI

0.26

C_N

0.22

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

C3 classification CC

Number of members (P>50%) 26

Radius (P>50% members) 39.2 [arcmin]

C_N 0.26 Poorly populated
C_dens 0.22 Very loose
C_C3 0.25 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

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

Overview

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UPK 438 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a young cluster (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.

Very close Low extinction Young

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for UPK 438 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	–	100.915	-8.506	2.363	-6.521	2.725	35.187
Hunt & Reffert	2023	101.145	-9.202	2.304	-6.088	2.845	37.892
He et al.	2022	100.914	-8.553	2.488	-7.075	2.753	–
Sim et al.	2019	100.768	-8.251	–	-6.59	2.68	–

💡 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
Hunt & Reffert	2023	0.41	0.32	0.99	324	–	–	–	–
He et al.	2022	–	0.80	–	40	–	–	–	–
Sim et al.	2019	0.45	–	–	63	–	–	–	–

Visualization

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