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), in the region of the Sagittarius constellation (IAU figure Sgr).
Catalog context
21 Sgr. It appears in classical and modern catalogs as HIP 90289, HD 169420, Gaia DR3 4091210409716888704. In the SkyKeepsake Sagittarius (Sgr) browse hub it sits with other stars of the same IAU figure.
Catalog identifiers
- Gaia
- Gaia DR3 4091210409716888704
- HIP
- 90289
- HD
- 169420
- gaia_dr3
- 4091210409716888704
- Bayer / Flamsteed
- 21 Sgr
Observed properties
- Visual magnitude
- 4.34