Registry · deep sky

Cl* Westerlund 1 W 21

BlueSG SIMBAD s*b B0.5Ia 15 papers

harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.

Right ascension: 16h 47m 01.11s
Declination: −45° 51′ 13.6″
Galactic l, b: 339.54, -0.3993
Magnitude V: 18.41
Parallax: 0.2963 mas
Redshift z: -0.00015536
Radial velocity: -46.58 km/s
Proper motion: -2.517, -3.582 mas/yr

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
Cl* Westerlund 1 CN I	WolfRayet*	7.341″	—
[CRN2020] W1023	Star	10.57″	—
Cl* Westerlund 1 W 24	BlueSG	10.95″	18.71
[CRN2020] W1024	BlueSG	12.06″	19.38
Cl Westerlund 1	OpenCluster	14.98″	—
Cl* Westerlund 1 W 23a	BlueSG	16.01″	18.32
Cl* Westerlund 1 W 47	BlueSG	16.46″	19.95
Cl* Westerlund 1 W 52	BlueSG	17.6″	17.88
Cl* Westerlund 1 W 48	Variable*	18.09″	—
Cl* Westerlund 1 W 12	YellowSG	18.64″	17.57
[CRN2020] W1031	Star	18.83″	—

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/cl-westerlund-1-w-21 · Registry entry updated 2026-08-14.