20123-0806 BU 1205 (HD 191841)
20h 12m 15.32s -08° 05' 32.1" P.A. 212.00 sep 0.2 mag 7.50,8.80 Sp F5V dist. 73.91 pc (241.09 l.y.)
| Coord 2000 |
20123-0806 |
|
Discov num |
BU 1205 |
|
Comp |
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Coord arcsec 2000 |
20 12 15.32 -08 05 32.1 |
|
| Date first |
1890 |
|
Date last |
2008 |
|
Obs |
22 |
|
| Pa first |
49 |
|
Pa last |
211.8 |
|
P.A. Now (θ) |
211.8° |
|
| Sep first |
0.6 |
|
Sep last |
0.247 |
|
Sep. Now (ρ) |
0.247" |
|
| Mag pri |
7.50 |
|
Mag sec |
8.80 |
|
delta mag (ΔM) |
1.3 |
|
Spectral class |
F5V (yellow-white) |
|
| Pri motion ra |
+015 |
|
Sec motion ra |
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|
| Pri motion dec |
-035 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 191841 |
|
Constellation |
Aquila |
|
SAO |
144164 |
|
HIP |
99558 |
|
| Tycho2 |
5740-00887-1 |
|
Gaia DR2 |
4215770852139704960 |
|
HD |
191841 |
|
GC |
28034 |
|
| ADS |
13493 |
|
BD |
BD-08 5272 |
|
Distance |
73.91 |
|
Distance ly |
241.09 |
|
ORBITAL ELEMENTS
| Period (P) | 139.9y | |
Periastron (T) | 1983.5y | |
Semi-major axis (a) | 0.486a | |
| Eccentricity (e) | 0.384 | |
Inclination (i) | 78.3° | |
Longitude of periastron (ω) | 10.4° | |
| Node (Ω) | 231.24° | |
Notes | | |
Reference | Hrt2010a | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
341.4 |
0.086 |
| 2001 |
355.0 |
0.098 |
| 2002 |
5.1 |
0.115 |
| 2003 |
12.5 |
0.134 |
| 2004 |
18.1 |
0.154 |
| 2005 |
22.3 |
0.175 |
| 2006 |
25.7 |
0.196 |
| 2007 |
28.4 |
0.217 |
| 2008 |
30.6 |
0.238 |
| 2009 |
32.4 |
0.258 |
| 2010 |
34.0 |
0.279 |
| 2011 |
35.4 |
0.299 |
| 2012 |
36.6 |
0.318 |
| 2013 |
37.6 |
0.337 |
| 2014 |
38.6 |
0.356 |
| 2015 |
39.4 |
0.374 |
| 2016 |
40.2 |
0.392 |
| 2017 |
40.9 |
0.409 |
| 2018 |
41.6 |
0.426 |
| 2019 |
42.2 |
0.442 |
| 2020 |
42.7 |
0.457 |
| 2021 |
43.3 |
0.472 |
| 2022 |
43.7 |
0.486 |
| 2023 |
44.2 |
0.500 |
| 2024 |
44.7 |
0.514 |
| 2025 |
45.1 |
0.526 |
| 2026 |
45.5 |
0.538 |
| 2027 |
45.9 |
0.550 |
| 2028 |
46.2 |
0.561 |
| 2029 |
46.6 |
0.571 |
| 2030 |
46.9 |
0.581 |
| 2031 |
47.3 |
0.591 |
| 2032 |
47.6 |
0.599 |
| 2033 |
47.9 |
0.608 |
| 2034 |
48.2 |
0.616 |
| 2035 |
48.5 |
0.623 |
| 2036 |
48.8 |
0.629 |
| 2037 |
49.1 |
0.635 |
| 2038 |
49.4 |
0.641 |
| 2039 |
49.6 |
0.646 |
| 2040 |
49.9 |
0.651 |
| 2041 |
50.2 |
0.655 |
| 2042 |
50.4 |
0.658 |
| 2043 |
50.7 |
0.661 |
| 2044 |
51.0 |
0.664 |
| 2045 |
51.2 |
0.666 |
| 2046 |
51.5 |
0.667 |
| 2047 |
51.7 |
0.668 |
| 2048 |
52.0 |
0.668 |
| 2049 |
52.2 |
0.668 |
| 2050 |
52.5 |
0.668 |
|
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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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