In Evidence
Other stars in Perseus
- Mirfak
- Algol
- Ī¶ Persei
- Īµ Persei
- Ī³ Persei
- Ī“ Persei
- Ļ Persei
- Miram
- Ī½ Persei
- Misam
- Atik
- Ļ Persei
- 48 Persei
- Menkib
- Ī¹ Persei
- Ļ Persei
- Īø Persei
- Ī¼ Persei
- 16 Persei
- Ļ Persei
- 58 Persei
- Ī» Persei
- Ļ Persei
- 17 Persei
- HR1324
- Ļ Persei
- 34 Persei
- Ļ Persei
- 52 Persei
- HR918
- HR991
- 53 Persei
- HR1533
- 12 Persei
- 24 Persei
- 54 Persei
- 32 Persei
- 40 Persei
- HR1034
- HR969
- 31 Persei
- 4 Persei
- 21 Persei
- 42 Persei
- 29 Persei
- 9 Persei
- HR1390
- HR890
- 43 Persei
- HR1011
- 59 Persei
- 36 Persei
- 20 Persei
- HR1207
- 14 Persei
- HR1330
- HR1063
- HR885
- 30 Persei
- HR1215
- 50 Persei
- 1 Persei
- HR1333
- HR1113
- HR1037
- HR1133
- HR1041
- HR1019
- HR1176
- HR1141
- HR618
- HR1482
- 3 Persei
- HR1286
- 55 Persei
- 8 Persei
- HR1198
- 56 Persei
- HR1191
- 11 Persei
- HR964
- 2 Persei
- HR1078
- HR1051
- HR526
- HR787
- HR1493
- HR842
- HR886
- HR529
- HR1074
- HR956
- HR1337
- HR1001
- HR986
- HR1514
- 7 Persei
- HR1489
- HR1170
- HR865
- HR876
- HR923
- HR1127
- HR978
- HR966
- HR1500
- HR1029
- 49 Persei
- 57 Persei
- HR1209
- HR1130
- HR920
- HR894
- HR1160
- HR950
- HR1344
- HR973
- HR1419
- HR864
- HR1328
- HR1371
- HR1047
- HR819
- HR1164
- HR1197
- HR976
- HR825
- 10 Persei
- HR849
- HR538
- HR1424
- HR690
- HR1056
- HR820
- HR1226
- HR975
- HR621
- HR930
- HR949
- HR846
- 5 Persei
- HR1229
- HR470
- HR1059
- HR933
- HR1072
- HR1234
- HR1097
- HR641
- HR831
- HR1301
- HR540
- HR979
- HR654
- HR792
- HR1020
- HR1026
- HR716
- HR1223
- HR1163
- HR891
21 Persei
21 Persei is a variable star of spectral class B9 in the constellation of Perseus.
21 Persei visual magnitude is 5.11. Because of its faintness, 21 Persei is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.
Celestial Coordinates
Apparent
J2000
Galactic Coordinates
Finder Chart
Magnitude, Color, Spectral Class
21 Persei is also a Si chemically peculiar star.The red dot in the diagram below shows where 21 Persei is situated in the HertzsprungāRussell diagram.
Distance, Radial Speed, Proper Motion
21 Persei is distant 386.71 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.
Alternative Designations
Visibility from Your Location
Today's 21 Persei rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):