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

C3 classification AB

Number of members (P>50%) 305

Radius (P>50% members) 1.2 [arcmin]

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 🔍 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.

(*): The parallax distance estimate (~4.82 kpc) differs significantly from the median photometric distance (~3.56 kpc).

Distant Extremely high extinction Extremely massive Very young

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	–	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	–
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]	Bfr	BSS
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	–	–	–	–	–	–	–
van den Bergh	2006	5.20	9.30	–	–	–	–	–	–
Dias et al.	2002	5.50	13.48	–	5	–	–	–	–

Visualization

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