How to see it
21 Sgr has a visual magnitude of about 4.34: under a reasonably dark sky it is typically reachable with the unaided eye.
Sky position
Equatorial coordinates for 21 Sgr: right ascension 18h 25m 21s, declination −20° 32′ 30″ (J2000), on the celestial sphere.
Catalog context
21 Sgr. It appears in classical and modern catalogs as HIP 90289, HD 169420, Gaia DR3 4091210409716888704.
Catalog identifiers
- Gaia
- Gaia DR3 4091210409716888704
- HIP
- 90289
- HD
- 169420
- gaia_dr3
- 4091210409716888704
- Bayer / Flamsteed
- 21 Sgr
Observed properties
- Visual magnitude
- 4.34