20396+1555 WCK 2 Aa,Ab
20h 39m 38.25s +15° 54' 43.4" P.A. 289.00 sep 0.1 mag 3.86,6.43 Sp B9IV dist. 77.82 pc (253.85 l.y.)
| Coord 2000 |
20396+1555 |
|
Discov num |
WCK 2 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
20 39 38.25 +15 54 43.4 |
|
| Date first |
1974 |
|
Date last |
2019 |
|
Obs |
92 |
|
| Pa first |
35 |
|
Pa last |
289.2 |
|
P.A. Now (θ) |
242.2° |
|
| Sep first |
0.2 |
|
Sep last |
0.135 |
|
Sep. Now (ρ) |
0.196" |
|
| Mag pri |
3.86 |
|
Mag sec |
6.43 |
|
delta mag (ΔM) |
2.57 |
|
Spectral class |
B9IV (blue-white) |
|
| Pri motion ra |
+066 |
|
Sec motion ra |
|
|
| Pri motion dec |
-002 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
20396+1555 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
106357 |
20 39 38 +15 54 43 |
WCK 2 Aa,Ab |
2019 |
92 |
289 |
0.1 |
3.86 |
6.43 |
2.57 |
Y |
<=== |
| Show |
|
106357 |
20 39 38 +15 54 43 |
CIA 23 Ab1,2 |
2019 |
11 |
250 |
0.0 |
3.86 |
6.43 |
2.57 |
|
|
| Show |
|
106357 |
20 39 38 +15 54 43 |
BU 298 AB |
2015 |
11 |
233 |
35.5 |
3.86 |
13.40 |
9.54 |
|
|
| Show |
Sualocin |
106357 |
20 39 38 +15 54 43 |
HJ 1554 AC |
2017 |
15 |
277 |
48.4 |
3.86 |
11.90 |
8.04 |
|
|
| Show |
|
106357 |
20 39 38 +15 54 43 |
BU 298 AD |
2015 |
13 |
160 |
45.4 |
3.86 |
12.90 |
9.04 |
|
|
| Show |
|
106357 |
20 39 38 +15 54 43 |
BU 298 AE |
2015 |
12 |
304 |
57.2 |
3.86 |
12.60 |
8.74 |
|
|
| Show |
|
106357 |
20 39 38 +15 54 43 |
BU 298 AF |
2015 |
12 |
118 |
72.2 |
3.86 |
10.70 |
6.84 |
|
|
Octuple system
6 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Sualocin |
|
Var name |
NSV13207 Del |
|
Constellation |
Delphinus |
|
SAO |
106357 |
|
| HIP |
101958 |
|
Tycho2 |
1633-02442-1 |
|
Gaia DR2 |
1810711143450256128 |
|
HD |
196867 |
|
| HR |
7906 |
|
GC |
28780 |
|
ADS |
14121 |
|
BD |
BD+15 4222 |
|
| Bayer |
Alpha Delphini |
|
Bayer name |
Alp Del |
|
Flamsteed |
9 Delphini |
|
Flamsteed name |
9 Del |
|
| FK5 |
774 |
|
Distance |
77.82 |
|
Distance ly |
253.85 |
|
Bayer greek |
α Del |
|
| Other names |
SVALOCIN, Scalovin |
|
| Meaning |
'Nicolaus' in reverse |
|
ORBITAL ELEMENTS
| Period (P) | 17y | |
Periastron (T) | 1983.8y | |
Semi-major axis (a) | 0.158a | |
| Eccentricity (e) | 0.47 | |
Inclination (i) | 160° | |
Longitude of periastron (ω) | 99° | |
| Node (Ω) | 129° | |
Notes | n | |
Reference | Sod1999 | |
| Equinox | 2000 | |
Last observation | | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
80.9 |
0.091 |
| 2001 |
15.5 |
0.080 |
| 2002 |
321.1 |
0.104 |
| 2003 |
290.0 |
0.134 |
| 2004 |
269.7 |
0.160 |
| 2005 |
254.6 |
0.180 |
| 2006 |
242.2 |
0.196 |
| 2007 |
231.4 |
0.207 |
| 2008 |
221.5 |
0.215 |
| 2009 |
212.2 |
0.218 |
| 2010 |
203.0 |
0.218 |
| 2011 |
193.6 |
0.214 |
| 2012 |
183.7 |
0.206 |
| 2013 |
172.8 |
0.193 |
| 2014 |
160.0 |
0.176 |
| 2015 |
143.7 |
0.152 |
| 2016 |
120.4 |
0.123 |
| 2017 |
80.9 |
0.091 |
| 2018 |
15.5 |
0.080 |
| 2019 |
321.1 |
0.104 |
| 2020 |
290.0 |
0.134 |
| 2021 |
269.7 |
0.160 |
| 2022 |
254.6 |
0.180 |
| 2023 |
242.2 |
0.196 |
| 2024 |
231.4 |
0.207 |
| 2025 |
221.5 |
0.215 |
| 2026 |
212.2 |
0.218 |
| 2027 |
203.0 |
0.218 |
| 2028 |
193.6 |
0.214 |
| 2029 |
183.7 |
0.206 |
| 2030 |
172.8 |
0.193 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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