18393+2056 STF 2360 (HD 172421)
18h 39m 19.16s +20° 55' 58.9" P.A. 358.00 sep 2.5 mag 7.97,9.16 Sp B5IV dist. 2500 pc (8155 l.y.)
| Coord 2000 |
18393+2056 |
|
Discov num |
STF2360 |
|
Comp |
|
|
Coord arcsec 2000 |
18 39 19.16 +20 55 58.9 |
|
| Date first |
1828 |
|
Date last |
2016 |
|
Obs |
72 |
|
| Pa first |
358 |
|
Pa last |
358.4 |
|
P.A. Now (θ) |
358.4° |
|
| Sep first |
2.4 |
|
Sep last |
2.454 |
|
Sep. Now (ρ) |
2.454" |
|
| Mag pri |
7.97 |
|
Mag sec |
9.16 |
|
delta mag (ΔM) |
1.19 |
|
Spectral class |
B5IV (blue-white) |
|
| Pri motion ra |
-005 |
|
Sec motion ra |
-002 |
|
| Pri motion dec |
-016 |
|
Sec motion dec |
-008 |
|
| Notes |
|
|
rPM=0.51
Nature of this double is uncertain.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 172421 |
|
Constellation |
Hercules |
|
SAO |
86288 |
|
HIP |
91468 |
|
| Tycho2 |
1582-00314-1 |
|
Gaia DR2 |
4531754001284452992 |
|
HD |
172421 |
|
GC |
25521 |
|
| BD |
BD+20 3880 |
|
Distance |
2500 |
|
Distance ly |
8155 |
|
