20524+2008 HO 144 (HD 198810)
20h 52m 21.84s +20° 07' 41.6" P.A. 350.00 sep 0.4 mag 7.98,8.95 Sp K4III+F0V dist. 222.22 pc (724.88 l.y.)
| Coord 2000 |
20524+2008 |
|
Discov num |
HO 144 |
|
Comp |
|
|
Coord arcsec 2000 |
20 52 21.84 +20 07 41.6 |
|
| Date first |
1886 |
|
Date last |
2021 |
|
Obs |
92 |
|
| Pa first |
168 |
|
Pa last |
350.1 |
|
P.A. Now (θ) |
350.1° |
|
| Sep first |
0.4 |
|
Sep last |
0.439 |
|
Sep. Now (ρ) |
0.439" |
|
| Mag pri |
7.98 |
|
Mag sec |
8.95 |
|
delta mag (ΔM) |
0.97 |
|
Spectral class |
K4III+F0V (yellow-orange/yellow-white) |
|
| Pri motion ra |
-004 |
|
Sec motion ra |
-004 |
|
| Pri motion dec |
+002 |
|
Sec motion dec |
+002 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 198810 |
|
Constellation |
Vulpecula |
|
SAO |
106598 |
|
HIP |
103028 |
|
| Tycho2 |
1655-00484-1 |
|
Gaia DR2 |
1813778707875923072 |
|
HD |
198810 |
|
ADS |
14379 |
|
| BD |
BD+19 4544 |
|
Distance |
222.22 |
|
Distance ly |
724.88 |
|
ORBITAL ELEMENTS
| Period (P) | 1644y | ± 186 |
Periastron (T) | 1944.84y | ± 0.07 |
Semi-major axis (a) | 1.031a | ± 0.071 |
| Eccentricity (e) | 0.791 | ± 0.015 |
Inclination (i) | 91.5° | ± 0.1 |
Longitude of periastron (ω) | 116.9° | ± 0.1 |
| Node (Ω) | 168.9° | ± 0.1 |
Notes | n | |
Reference | Lin2012a | |
| Equinox | 2000 | |
Last observation | 2007 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
347.9 |
0.356 |
| 2001 |
347.8 |
0.357 |
| 2002 |
347.8 |
0.357 |
| 2003 |
347.8 |
0.358 |
| 2004 |
347.7 |
0.359 |
| 2005 |
347.7 |
0.359 |
| 2006 |
347.7 |
0.360 |
| 2007 |
347.6 |
0.360 |
| 2008 |
347.6 |
0.361 |
| 2009 |
347.6 |
0.361 |
| 2010 |
347.6 |
0.361 |
| 2011 |
347.5 |
0.361 |
| 2012 |
347.5 |
0.362 |
| 2013 |
347.5 |
0.362 |
| 2014 |
347.4 |
0.362 |
| 2015 |
347.4 |
0.362 |
| 2016 |
347.4 |
0.362 |
| 2017 |
347.4 |
0.362 |
| 2018 |
347.3 |
0.362 |
| 2019 |
347.3 |
0.362 |
| 2020 |
347.3 |
0.362 |
| 2021 |
347.2 |
0.361 |
| 2022 |
347.2 |
0.361 |
| 2023 |
347.2 |
0.361 |
| 2024 |
347.2 |
0.360 |
| 2025 |
347.1 |
0.360 |
| 2026 |
347.1 |
0.360 |
| 2027 |
347.1 |
0.359 |
| 2028 |
347.0 |
0.359 |
| 2029 |
347.0 |
0.358 |
| 2030 |
347.0 |
0.358 |
|
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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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