20311+1548 A 1675 (HD 195481)
20h 31m 06.12s +15° 48' 27.5" P.A. 294.00 sep 0.1 mag 7.14,8.65 Sp A2V dist. 168.92 pc (551.02 l.y.)
| Coord 2000 |
20311+1548 |
|
Discov num |
A 1675 |
|
Comp |
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Coord arcsec 2000 |
20 31 06.12 +15 48 27.5 |
|
| Date first |
1907 |
|
Date last |
2021 |
|
Obs |
88 |
|
| Pa first |
327 |
|
Pa last |
293.7 |
|
P.A. Now (θ) |
290.4° |
|
| Sep first |
0.2 |
|
Sep last |
0.12 |
|
Sep. Now (ρ) |
0.125" |
|
| Mag pri |
7.14 |
|
Mag sec |
8.65 |
|
delta mag (ΔM) |
1.51 |
|
Spectral class |
A2V (white) |
|
| Pri motion ra |
-003 |
|
Sec motion ra |
|
|
| Pri motion dec |
-009 |
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Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 195481 |
|
Constellation |
Delphinus |
|
SAO |
106194 |
|
HIP |
101223 |
|
| Tycho2 |
1632-01088-1 |
|
Gaia DR2 |
1805573537932800896 |
|
HD |
195481 |
|
GC |
28542 |
|
| ADS |
13944 |
|
BD |
BD+15 4181 |
|
Distance |
168.92 |
|
Distance ly |
551.02 |
|
ORBITAL ELEMENTS
| Period (P) | 49.62y | |
Periastron (T) | 1947.75y | |
Semi-major axis (a) | 0.145a | |
| Eccentricity (e) | 0.568 | |
Inclination (i) | 109.4° | |
Longitude of periastron (ω) | 60.2° | |
| Node (Ω) | 142.6° | |
Notes | n | |
Reference | Hrt2001b | |
| Equinox | 2000 | |
Last observation | 1994 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
344.4 |
0.056 |
| 2001 |
335.2 |
0.080 |
| 2002 |
330.1 |
0.100 |
| 2003 |
326.5 |
0.117 |
| 2004 |
323.8 |
0.131 |
| 2005 |
321.6 |
0.142 |
| 2006 |
319.6 |
0.151 |
| 2007 |
317.9 |
0.158 |
| 2008 |
316.3 |
0.163 |
| 2009 |
314.7 |
0.166 |
| 2010 |
313.2 |
0.169 |
| 2011 |
311.8 |
0.170 |
| 2012 |
310.4 |
0.170 |
| 2013 |
308.9 |
0.170 |
| 2014 |
307.4 |
0.168 |
| 2015 |
305.9 |
0.165 |
| 2016 |
304.4 |
0.162 |
| 2017 |
302.8 |
0.159 |
| 2018 |
301.1 |
0.154 |
| 2019 |
299.3 |
0.149 |
| 2020 |
297.3 |
0.144 |
| 2021 |
295.2 |
0.138 |
| 2022 |
292.9 |
0.132 |
| 2023 |
290.4 |
0.125 |
| 2024 |
287.6 |
0.118 |
| 2025 |
284.4 |
0.112 |
| 2026 |
280.9 |
0.104 |
| 2027 |
276.8 |
0.097 |
| 2028 |
272.0 |
0.091 |
| 2029 |
266.5 |
0.084 |
| 2030 |
260.1 |
0.078 |
|
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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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