20519+0544 A 613 (HD 198684)
20h 51m 54.49s +05° 44' 29.5" P.A. 324.00 sep 0.7 mag 9.10,9.03 Sp F5
Coord 2000 |
20519+0544 |
|
Discov num |
A 613 |
|
Comp |
|
|
Coord arcsec 2000 |
20 51 54.49 +05 44 29.5 |
|
Date first |
1903 |
|
Date last |
2018 |
|
Obs |
57 |
|
Pa first |
9 |
|
Pa last |
324.1 |
|
P.A. Now (θ) |
324.1° |
|
Sep first |
0.8 |
|
Sep last |
0.73 |
|
Sep. Now (ρ) |
0.73" |
|
Mag pri |
9.10 |
|
Mag sec |
9.03 |
|
delta mag (ΔM) |
0.07 |
|
Spectral class |
F5 (yellow-white) |
|
Pri motion ra |
+075 |
|
Sec motion ra |
+075 |
|
Pri motion dec |
-004 |
|
Sec motion dec |
-004 |
|
Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 198684 |
|
Constellation |
Delphinus |
|
SAO |
126304 |
|
Tycho2 |
0524-01786-1 |
|
Gaia DR2 |
1735730806984435712 |
|
HD |
198684 |
|
ADS |
14368 |
|
ORBITAL ELEMENTS
Period (P) | 695y | |
Periastron (T) | 2605y | |
Semi-major axis (a) | 1.05a | |
Eccentricity (e) | 0.227 | |
Inclination (i) | 118° | |
Longitude of periastron (ω) | 160.8° | |
Node (Ω) | 178.4° | |
Notes | | |
Reference | USN2002 | |
Equinox | 2000 | |
Last observation | 1996 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
329.0 |
0.678 |
2001 |
328.4 |
0.674 |
2002 |
327.8 |
0.670 |
2003 |
327.2 |
0.666 |
2004 |
326.7 |
0.662 |
2005 |
326.1 |
0.658 |
2006 |
325.4 |
0.653 |
2007 |
324.8 |
0.649 |
2008 |
324.2 |
0.645 |
2009 |
323.6 |
0.641 |
2010 |
322.9 |
0.637 |
2011 |
322.3 |
0.633 |
2012 |
321.6 |
0.629 |
2013 |
321.0 |
0.625 |
2014 |
320.3 |
0.621 |
2015 |
319.6 |
0.618 |
2016 |
318.9 |
0.614 |
2017 |
318.2 |
0.610 |
2018 |
317.5 |
0.606 |
2019 |
316.8 |
0.602 |
2020 |
316.1 |
0.598 |
2021 |
315.4 |
0.594 |
2022 |
314.6 |
0.591 |
2023 |
313.9 |
0.587 |
2024 |
313.1 |
0.583 |
2025 |
312.3 |
0.580 |
2026 |
311.5 |
0.576 |
2027 |
310.8 |
0.573 |
2028 |
309.9 |
0.569 |
2029 |
309.1 |
0.566 |
2030 |
308.3 |
0.562 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|