17140+1621 HO 557 (AK Her)
17h 13m 57.81s +16° 21' 01.0" P.A. 323.00 sep 4.5 mag 8.57,12.00 Sp F8 dist. 106.27 pc (346.65 l.y.)
| Coord 2000 |
17140+1621 |
|
Discov num |
HO 557 |
|
Comp |
|
|
Coord arcsec 2000 |
17 13 57.81 +16 21 01.0 |
|
| Date first |
1895 |
|
Date last |
2016 |
|
Obs |
18 |
|
| Pa first |
323 |
|
Pa last |
322.8 |
|
P.A. Now (θ) |
322.8° |
|
| Sep first |
4.3 |
|
Sep last |
4.467 |
|
Sep. Now (ρ) |
4.467" |
|
| Mag pri |
8.57 |
|
Mag sec |
12.00 |
|
delta mag (ΔM) |
3.43 |
|
Spectral class |
F8 (yellow-white) |
|
| Pri motion ra |
+020 |
|
Sec motion ra |
|
|
| Pri motion dec |
-046 |
|
Sec motion dec |
|
|
| Notes |
N
(See Notes) |
|
Nature of this double is uncertain.
OTHER CATALOGS AND DESIGNATIONS
| Var name |
AK Her |
|
Constellation |
Hercules |
|
SAO |
102668 |
|
HIP |
84293 |
|
| Tycho2 |
1536-01738-1 |
|
Gaia DR2 |
4546891252744542976 |
|
HD |
155937 |
|
BD |
BD+16 3130 |
|
| Distance |
106.27 |
|
Distance ly |
346.65 |
|
SUSPECTED ORBITAL ELEMENTS
| Identifier | 17140+1621 HO 557 A |
| coord_arcsec_2000 | 171357.81+162101.0 |
| Period (P) | 57.8y | ± 8 |
Periastron (T) | | |
Semi-major axis (a) | | |
| Eccentricity (e) | 0.16 | ± 0.06 |
Inclination (i) | 80.8° | |
Longitude of periastron (ω) | ° | |
| Node (Ω) | ° | |
Notes | n | |
Reference | Pbl2006 | |
| Equinox | | |
Last observation | | |
Grade | 7 | (1=Definitive, 9=Indet.) |
Not enought orbital data to create a graph.
