UPK 41

(OCSN 292)

0.69 UTI

0.82

C_N

1.0

C_dens

0.75

C_C3

0.45

C_lit

1.0

C_dup

N₅₀ (P>50% members) 283

Stellar density (N₅₀/rad) 14.9 [N/pc²]

C3 classification AB

C_N 0.82 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.45 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 41 is a rich, very dense object of high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the distance, absorption, and age parameters (see Parameters). It is poorly studied in the literature.

Note: This object shares a small percentage of members with 4 later reported entries. See table with shared members information.

Close Moderate extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as hyperbolic encounter pair 269 along with IC_4756, and as primordial binary cluster 391 along with UPK_39, and of multiple system 75 along with UPK_39 and IC_4756.

Palma et al. (2025)
Part of multiple system G257, along with IC_4756 and UPK_39.

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for UPK 41 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	99999–	279.577	0.42	2.089	2.634	-8.286	-5.036
Liu et al.	2025	279.46	0.46	2.09	2.66	-8.27	-3.37
Zhang et al.	2024	279.462	0.461	–	–	–	–
Hunt & Reffert	2024	279.462	0.461	2.092	2.657	-8.269	-3.372
Cavallo et al.	2024	279.734	0.367	2.089	–	–	–
Hunt & Reffert	2023	279.462	0.461	2.092	2.657	-8.269	-3.372
Qin et al.	2023	279.52	0.5	2.08	2.75	-8.17	-5.7
He et al.	2022	279.619	0.342	2.096	2.647	-8.242	–
Sim et al.	2019	279.742	0.495	–	2.51	-8.13	–

💡 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–	0.55	2.89	2.41	6	-0.077	316	–	–
Liu et al.	2025	0.90	0.79	–	19	–	–	–	–
Zhang et al.	2024	–	–	–	–	-0.055⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	316⁽¹⁾	–	–
Cavallo et al.	2024	0.55	2.89	–	5	-0.100	–	–	–
Hunt & Reffert	2023	0.46	3.03	2.41	6	–	–	–	–
Qin et al.	2023	1.71	3.13	–	631	–	–	–	–
He et al.	2022	–	2.25	–	6	–	–	–	–
Sim et al.	2019	0.48	–	–	7	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv
CWWDL 14646	11.7	279.45	-0.34	2.13	2.75	-8.43	0.18
OC 0059	10.6	279.46	-0.37	2.14	2.83	-8.45	2.52
CWWDL 14647	10.2	279.98	0.64	2.09	2.52	-8.25	-7.7
OC 0062	8.8	279.39	0.44	2.06	2.55	-8.24	1.1

💡 Note: The % column shows the percentage of members that UPK 41 shares with each listed object.

Visualization

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