21397+5815 MLB 90 AB (HD 239731)
21h 39m 44.44s +58° 14' 44.0" P.A. 37.00 sep 8.2 mag 9.16,11.98 Sp B5 dist. 469.48 pc (1531.44 l.y.)
| Coord 2000 |
21397+5815 |
|
Discov num |
MLB 90 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 39 44.44 +58 14 44.0 |
|
| Date first |
1905 |
|
Date last |
2019 |
|
Obs |
24 |
|
| Pa first |
41 |
|
Pa last |
36.5 |
|
P.A. Now (θ) |
36.5° |
|
| Sep first |
8.7 |
|
Sep last |
8.187 |
|
Sep. Now (ρ) |
8.187" |
|
| Mag pri |
9.16 |
|
Mag sec |
11.98 |
|
delta mag (ΔM) |
2.82 |
|
Spectral class |
B5 (blue-white) |
|
| Pri motion ra |
-002 |
|
Sec motion ra |
-006 |
|
| Pri motion dec |
-006 |
|
Sec motion dec |
-004 |
|
| Notes |
|
|
rPM=0.62
Nature of this double is uncertain.
21397+5815 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 239731 |
33643 |
21 39 44 +58 14 44 |
MLB 90 AB |
2019 |
24 |
37 |
8.2 |
9.16 |
11.98 |
2.82 |
|
<=== |
| Show |
|
33643 |
21 39 44 +58 14 44 |
MLB 90 AC |
2016 |
10 |
136 |
29.7 |
9.16 |
11.34 |
2.18 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 239731 |
|
Constellation |
Cepheus |
|
SAO |
33643 |
|
HIP |
106956 |
|
| Tycho2 |
3979-01003-1 |
|
Gaia DR2 |
2178573580536000384 |
|
HD |
239731 |
|
BD |
BD+57 2360 |
|
| Distance |
469.48 |
|
Distance ly |
1531.44 |
|