20406+1539 HDS 2947 (HD 197039)
20h 40m 35.25s +15° 38' 35.3" P.A. 111.00 sep 0.2 mag 7.27,8.14 Sp F5 dist. 71.63 pc (233.66 l.y.)
Coord 2000 |
20406+1539 |
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Discov num |
HDS2947 |
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Comp |
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Coord arcsec 2000 |
20 40 35.25 +15 38 35.3 |
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Date first |
1991 |
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Date last |
2021 |
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Obs |
38 |
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Pa first |
101 |
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Pa last |
110.6 |
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P.A. Now (θ) |
108.1° |
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Sep first |
0.2 |
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Sep last |
0.196 |
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Sep. Now (ρ) |
0.222" |
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Mag pri |
7.27 |
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Mag sec |
8.14 |
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delta mag (ΔM) |
0.87 |
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Spectral class |
F5 (yellow-white) |
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Pri motion ra |
+094 |
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Sec motion ra |
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Pri motion dec |
+045 |
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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 197039 |
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Constellation |
Delphinus |
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SAO |
106369 |
|
HIP |
102029 |
|
Tycho2 |
1634-00576-1 |
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Gaia DR2 |
1810621567612258048 |
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HD |
197039 |
|
GC |
28807 |
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BD |
BD+15 4227 |
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Distance |
71.63 |
|
Distance ly |
233.66 |
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ORBITAL ELEMENTS
Period (P) | 17.688y | |
Periastron (T) | 2014.815y | |
Semi-major axis (a) | 0.139a | |
Eccentricity (e) | 0.749 | |
Inclination (i) | 104.3° | |
Longitude of periastron (ω) | 158.3° | |
Node (Ω) | 101.6° | |
Notes | | |
Reference | Tok2020g | |
Equinox | 2000 | |
Last observation | 2019 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
122.1 |
0.093 |
2001 |
116.8 |
0.130 |
2002 |
113.8 |
0.160 |
2003 |
111.6 |
0.185 |
2004 |
109.9 |
0.204 |
2005 |
108.5 |
0.218 |
2006 |
107.2 |
0.227 |
2007 |
106.0 |
0.231 |
2008 |
104.7 |
0.229 |
2009 |
103.5 |
0.221 |
2010 |
102.1 |
0.207 |
2011 |
100.4 |
0.184 |
2012 |
98.1 |
0.152 |
2013 |
94.2 |
0.107 |
2014 |
80.2 |
0.040 |
2015 |
277.7 |
0.037 |
2016 |
176.3 |
0.023 |
2017 |
129.5 |
0.064 |
2018 |
120.1 |
0.105 |
2019 |
115.7 |
0.140 |
2020 |
113.0 |
0.168 |
2021 |
111.0 |
0.191 |
2022 |
109.4 |
0.209 |
2023 |
108.1 |
0.222 |
2024 |
106.8 |
0.229 |
2025 |
105.6 |
0.231 |
2026 |
104.4 |
0.227 |
2027 |
103.1 |
0.217 |
2028 |
101.6 |
0.201 |
2029 |
99.8 |
0.175 |
2030 |
97.2 |
0.140 |
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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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