20507-3116 B 997 (HD 198340)
20h 50m 41.84s -31° 15' 45.4" P.A. 273.00 sep 0.2 mag 8.66,10.10 Sp F8V dist. 91.74 pc (299.26 l.y.)
| Coord 2000 |
20507-3116 |
|
Discov num |
B 997 |
|
Comp |
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Coord arcsec 2000 |
20 50 41.84 -31 15 45.4 |
|
| Date first |
1927 |
|
Date last |
2019 |
|
Obs |
26 |
|
| Pa first |
95 |
|
Pa last |
273.4 |
|
P.A. Now (θ) |
291.1° |
|
| Sep first |
0.3 |
|
Sep last |
0.165 |
|
Sep. Now (ρ) |
0.185" |
|
| Mag pri |
8.66 |
|
Mag sec |
10.10 |
|
delta mag (ΔM) |
1.44 |
|
Spectral class |
F8V (yellow-white) |
|
| Pri motion ra |
-032 |
|
Sec motion ra |
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|
| Pri motion dec |
+002 |
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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 198340 |
|
Constellation |
Microscopium |
|
SAO |
212486 |
|
HIP |
102892 |
|
| Tycho2 |
7457-01611-1 |
|
Gaia DR2 |
6793908156489111936 |
|
HD |
198340 |
|
CD |
CD-3117886 |
|
| CP |
CP-31 6359 |
|
Distance |
91.74 |
|
Distance ly |
299.26 |
|
ORBITAL ELEMENTS
| Period (P) | 63.67y | ± 34.66 |
Periastron (T) | 2014.34y | ± 14.29 |
Semi-major axis (a) | 0.207a | ± 0.053 |
| Eccentricity (e) | 0.179 | ± 0.142 |
Inclination (i) | 41.5° | ± 8.1 |
Longitude of periastron (ω) | 306.4° | ± 141.1 |
| Node (Ω) | 281.1° | ± 27.2 |
Notes | n | |
Reference | Tok2015c | |
| Equinox | 2000 | |
Last observation | 2014 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
120.2 |
0.200 |
| 2001 |
124.8 |
0.192 |
| 2002 |
129.8 |
0.184 |
| 2003 |
135.3 |
0.176 |
| 2004 |
141.4 |
0.168 |
| 2005 |
148.1 |
0.159 |
| 2006 |
155.5 |
0.151 |
| 2007 |
163.7 |
0.144 |
| 2008 |
172.8 |
0.138 |
| 2009 |
182.5 |
0.133 |
| 2010 |
192.8 |
0.131 |
| 2011 |
203.2 |
0.131 |
| 2012 |
213.6 |
0.133 |
| 2013 |
223.4 |
0.136 |
| 2014 |
232.7 |
0.142 |
| 2015 |
241.2 |
0.148 |
| 2016 |
249.0 |
0.154 |
| 2017 |
256.2 |
0.161 |
| 2018 |
262.8 |
0.167 |
| 2019 |
269.0 |
0.173 |
| 2020 |
274.8 |
0.177 |
| 2021 |
280.4 |
0.181 |
| 2022 |
285.8 |
0.183 |
| 2023 |
291.1 |
0.185 |
| 2024 |
296.2 |
0.186 |
| 2025 |
301.4 |
0.186 |
| 2026 |
306.6 |
0.185 |
| 2027 |
311.9 |
0.184 |
| 2028 |
317.2 |
0.182 |
| 2029 |
322.6 |
0.180 |
| 2030 |
328.2 |
0.178 |
|
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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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