L1641S

(OCSN 213)

0.65 UTI

0.84

C_N

1.0

C_dens

1.0

C_C3

0.45

C_lit

0.86

C_dup

N_m (P>50%) 344

Core radius and density 0.7 [pc], 47 [pc^-2]

C3 classification AA

C_N 0.84 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.45 Poorly studied
C_dup 0.86 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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L1641S is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, below 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 absorption, age, and metallicity parameters (see Parameters). It is poorly studied in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

Very close Moderate extinction Near-solar metallicity Very young

Palma et al. (2025)
Part of multiple system G210, along with OCSN_70 and OC_0356.

Cavallo et al. (2024)
Wood sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.27 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.27 (50th percentile).

Lada & Lada (2003)
Embedded cluster within ∼2 Kpc of the Sun.

Data

🔍 Search references for L1641S 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–	85.648	-8.128	2.34	0.097	-0.36	15.819
Li et al.	2025	85.675	-8.133	2.288	0.013	-0.39	–
Wei et al.	2025	85.66	-8.118	2.369	0.176	-0.278	–
Hunt & Reffert	2024	85.641	-8.138	2.354	0.074	-0.328	13.708
Celli et al.	2024	85.675	-8.133	–	–	–	–
Cavallo et al.	2024	85.679	-8.114	2.354	–	–	–
Hunt & Reffert	2023	85.641	-8.138	2.354	0.074	-0.328	13.708
Qin et al.	2023	85.64	-8.13	2.35	0.1	-0.33	15.67
He et al.	2022	85.281	-8.294	2.347	0.259	-0.763	–
Cantat-Gaudin et al.	2020	85.675	-8.133	2.288	0.013	-0.39	–
Donor et al.	2020	85.62	-8.15	–	0.36	-0.5	22.0
Cantat-Gaudin & Anders	2020	85.675	-8.133	2.288	0.013	-0.39	–
Cantat-Gaudin et al.	2018	85.675	-8.133	2.288	0.013	-0.39	–
Joshi et al.	2016	85.62	-8.15	–	–	–	–
Lada & Lada	2003	88.12	-8.125	–	–	–	–

💡 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–	0.48	2.56	2.51	6	-0.050	98	0.45	–
Li et al.	2025	0.48	1.62	–	5	-0.051	–	–	–
Wei et al.	2025	0.35	0.75	–	19	0.500	318	0.45	–
Hunt & Reffert	2024	0.41	2.60	2.51	12	–	51⁽¹⁾	–	–
Celli et al.	2024	–	–	–	4	–	118	–	–
Cavallo et al.	2024	0.55	2.56	–	23	0.150	–	–	–
Hunt & Reffert	2023	0.41	2.60	2.51	12	–	–	–	–
Qin et al.	2023	0.78	1.51	–	5	–	–	–	–
He et al.	2022	–	0.40	–	3	–	–	–	–
Spina et al.	2022	–	–	–	–	-0.050	–	–	–
Kounkel et al.	2020	0.48	3.82	–	7	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.050	–	–	–
Cantat-Gaudin & Anders	2020	0.43	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.43	–	–	–	–	–	–	–
Joshi et al.	2016	0.50	6.57	–	4	–	–	–	–
Lada & Lada	2003	0.50	–	–	–	–	78	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
LDN1641 South	13.7	85.62	-8.13	2.34	-0.1	-0.26	15.78	0.49
IRAS 05404-0839	7.0	85.71	-8.65	2.33	0.18	-0.55	11.31	0.4
OCSN 70	0.9	85.34	-9.45	2.27	0.53	-1.21	16.14	0.26

💡 Note: The % column shows the percentage of members that L1641S shares with each listed object.

Visualization

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