UPK 398

(OCSN 308)

0.84 UTI

0.66

C_N

1.0

C_dens

1.0

C_C3

0.78

C_lit

1.0

C_dup

N₅₀ (P>50% members) 83

Stellar density (N₅₀/rad) 20.5 [N/pc²]

C3 classification AA

C_N 0.66 Moderately populated
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.78 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 398 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is well-studied in the literature.

Very close Low extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 396 along with CWNU_1106, and of multiple system 32 along with CWNU_1106, Collinder_69 and CWNU_1092.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for UPK 398 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–	86.019	7.035	2.24	-3.26	-1.781	29.613
Liu et al.	2025	85.96	7.06	2.25	-3.26	-1.75	25.23
Li et al.	2025	85.994	7.021	2.176	-3.315	-1.714	–
Almeida et al.	2025	85.989	7.063	–	–	–	–
Alfonso et al.	2024	85.995	7.024	2.2	-3.213	-1.777	–
Zhang et al.	2024	85.956	7.059	–	–	–	–
Hunt & Reffert	2024	85.956	7.059	2.251	-3.257	-1.748	25.231
Celli et al.	2024	85.994	7.021	–	–	–	–
Cavallo et al.	2024	86.093	7.006	2.255	–	–	–
Hunt & Reffert	2023	85.956	7.059	2.251	-3.257	-1.748	25.231
Qin et al.	2023	85.96	7.04	2.26	-3.27	-1.74	27.92
He et al.	2022	86.057	7.039	2.26	-3.232	-1.761	–
Dias et al.	2021	85.989	7.063	2.172	-3.298	-1.747	30.658
Cantat-Gaudin et al.	2020	85.994	7.021	2.176	-3.315	-1.714	–
Cantat-Gaudin & Anders	2020	85.984	7.02	2.196	-3.276	-1.737	–
Sim et al.	2019	86.012	7.027	–	-3.34	-1.76	–

💡 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–	0.45	0.415	1.03	11	0.007	57	–	–
Liu et al.	2025	0.51	0.22	–	16	–	–	–	–
Li et al.	2025	0.49	0.45	–	5	-0.174	–	–	–
Almeida et al.	2025	0.45	0.47	–	14	–	65	–	–
Alfonso et al.	2024	0.45	0.38	–	11	0.007	–	–	–
Zhang et al.	2024	–	–	–	–	0.059⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	51⁽¹⁾	–	–
Celli et al.	2024	–	–	–	11	–	57	–	–
Cavallo et al.	2024	0.49	1.00	–	4	-0.030	–	–	–
Hunt & Reffert	2023	0.43	0.80	1.03	12	–	–	–	–
Qin et al.	2023	0.50	0.31	–	7	–	–	–	–
He et al.	2022	–	0.05	–	9	–	–	–	–
Dias et al.	2021	0.45	0.47	–	14	0.007	–	–	–
Cantat-Gaudin et al.	2020	0.45	0.38	–	11	–	–	–	–
Cantat-Gaudin & Anders	2020	0.45	–	–	–	–	–	–	–
Sim et al.	2019	0.45	–	–	13	–	–	–	–

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

Visualization

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