Westerlund 1

(OCL 985; ESO 277 12; MWSC 2461)

0.72 UTI

0.83

C_N

1.0

C_dens

0.75

C_C3

0.5

C_lit

1.0

C_dup

N₅₀ (P>50% members) 305

Stellar density (N₅₀/rad) 107.9 [N/pc²]

C3 classification AB

C_N 0.83 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.5 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Westerlund 1 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by extremely high extinction. It is catalogued as an extremely massive, very young cluster (see Parameters). It is moderately studied in the literature.

Distant Extremely high extinction Extremely massive Very young

Morales et al. (2013)
Classified as morphological type 'OC0' (emerging exposed cluster). Morphological flag: one or a few submm emission within the cluster area.

Data

🔍 Search references for Westerlund 1 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–	251.76	-45.853	0.208	-2.282	-3.692	33.125
Celli et al.	2024	251.76	-45.852	–	–	–	–
Cantat-Gaudin et al.	2020	251.76	-45.852	0.252	-2.325	-3.654	–
Cantat-Gaudin & Anders	2020	251.76	-45.852	0.252	-2.325	-3.654	–
Soubiran et al.	2018	251.76	-45.852	–	–	–	-41.07
Bica et al.	2019	251.763	-45.848	–	–	–	–
Cantat-Gaudin et al.	2018	251.76	-45.852	0.252	-2.325	-3.654	–
Morales et al.	2013	251.768	-45.846	–	–	–	–
van den Bergh	2006	251.767	-45.845	–	–	–	–
Dias et al.	2002	251.767	-45.843	–	-4.5	-10.01	–

💡 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–	3.78	11.39	–	5	–	22227	–	–
Celli et al.	2024	–	–	–	8	–	22227	–	–
Cantat-Gaudin & Anders	2020	3.56	–	–	–	–	–	–	–
Soubiran et al.	2018	3.56	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.56	–	–	–	–	–	–	–
Morales et al.	2013	4.00	–	–	4	–	–	–	–
van den Bergh	2006	5.20	9.30	–	–	–	–	–	–
Dias et al.	2002	5.50	13.48	–	5	–	–	–	–

Visualization

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